497 results match your criteria i-Perception[Journal]


Topological Sensitivity in the Recognition of Disoriented Figures.

Authors:
Fumio Kanbe

Iperception 2018 Nov-Dec;9(6):2041669518809717. Epub 2018 Nov 5.

Faculty of Education, Hakuoh University, Oyama, Tochigi, Japan.

A previous study by the author found that discrimination latencies for figure pairs with the same topological structure (isomorphic pairs) were longer than for pairs with different topological structures (nonisomorphic pairs). These results suggest that topological sensitivity occurs during figure recognition. However, sameness was judged in terms of both shape and orientation. Read More

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November 2018

Color, Music, and Emotion: Bach to the Blues.

Iperception 2018 Nov-Dec;9(6):2041669518808535. Epub 2018 Nov 11.

Department of Psychology, University of California, Berkeley, CA, USA.

When people make cross-modal matches from classical music to colors, they choose colors whose emotional associations fit the emotional associations of the music, supporting the . We further explored this result with a large, diverse sample of 34 musical excerpts from different genres, including Blues, Salsa, Heavy metal, and many others, a broad sample of 10 emotion-related rating scales, and a large range of 15 rated music-perceptual features. We found systematic music-to-color associations between perceptual features of the music and perceptual dimensions of the colors chosen as going best/worst with the music (e. Read More

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November 2018
2 Reads

Graininess of RGB-Display Space.

Iperception 2018 Sep-Oct;9(5):2041669518803971. Epub 2018 Oct 23.

Justus Liebig Universität Giessen, Germany.

RGB-display space, that is, the 'RGB-cube', was sampled at 3,000 locations, uniformly and randomly distributed. Fifty observers contributed 60 samples each. At each location, participants synthesised a copy of the target, using a generic colour picker. Read More

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October 2018

Do Explicit Estimates of Angular Declination Become Ungrounded in the Presence of a Ground Plane?

Iperception 2018 Sep-Oct;9(5):2041669518808536. Epub 2018 Oct 29.

Department of Psychology, Swarthmore College, PA, USA.

In a series of seven experiments (total  = 220), it is shown that explicit angular declination judgments are influenced by the presence of a ground plane in the background. This is of theoretical importance because it bears on the interpretation of the relationship between angular declination and perceived distance on a ground plane. Explicit estimates of ground distance are consistent with a simple 1. Read More

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October 2018
2 Reads

Can Color and Motion Information Be Used to Disentangle the Influence of Multiple Light Sources on Gloss Perception?

Iperception 2018 Sep-Oct;9(5):2041669518803964. Epub 2018 Oct 10.

Institut für Psychologie, Christian-Albrechts-Universität zu Kiel, Germany.

Previous results suggest that the glossiness of a surface is systematically underestimated when adjacent highlights from different light sources overlap to such an extent that they appear as a single, expanded highlight. Here we investigated how the availability of color- and motion-induced information, which may help to unravel such merged highlights, affects gloss constancy. We used images of computer-generated scenes where a complex 3D object made of glossy material was illuminated by three point light sources, which had varying distances to each other. Read More

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October 2018

Crowding and the Furrow Illusion.

Iperception 2018 Sep-Oct;9(5):2041669518801029. Epub 2018 Sep 27.

Department of Psychology, Glendon College, CVR, York University, Toronto, Ontario, Canada; Department of Psychological and Brain Sciences, Dartmouth College, Hanover, NH, USA.

A spot moves vertically across a large grating of oblique parallel lines. When viewed peripherally, the motion path looks oblique, close to the orientation of the background grating. Even when the grating's orientation is concealed by , it can still deflect the spot's perceived motion path. Read More

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September 2018

The Illusion of Uniformity Does Not Depend on the Primary Visual Cortex: Evidence From Sensory Adaptation.

Iperception 2018 Sep-Oct;9(5):2041669518800507. Epub 2018 Sep 27.

Sackler Centre for Consciousness Science, University of Sussex, Brighton, UK; Department of Informatics, University of Sussex, Brighton, UK.

Visual experience appears richly detailed despite the poor resolution of the majority of the visual field, thanks to foveal-peripheral integration. The recently described uniformity illusion (UI), wherein peripheral elements of a pattern take on the appearance of foveal elements, may shed light on this integration. We examined the basis of UI by generating adaptation to a pattern of Gabors suitable for producing UI on orientation. Read More

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September 2018
3 Reads

The Role of the Pupil, Corneal Reflex, and Iris in Determining the Perceived Direction of Gaze.

Authors:
Stuart Anstis

Iperception 2018 Jul-Aug;9(4):2041669518765852. Epub 2018 Aug 21.

Department of Psychology, University of California, San Diego, La Jolla, CA, USA.

In specially constructed movies depicting moving eyes, the pupils, irises, and corneal reflexes moved independently and sometimes in opposite directions. We found that the moving pupils or the corneal reflex, not the moving irises, determined the perceived direction of gaze (online Movie 1). When the pupils and irises moved in opposite directions, the one with the higher Michelson contrast determined the perceived direction of gaze (online Movie 2). Read More

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August 2018
6 Reads

Individual Variability in Simultaneous Contrast for Color and Brightness: Small Sample Factor Analyses Reveal Separate Induction Processes for Short and Long Flashes.

Iperception 2018 Sep-Oct;9(5):2041669518800507. Epub 2018 Sep 23.

College of Psychology, John F. Kennedy University, Pleasant Hill, CA, USA.

In classic simultaneous color contrast and simultaneous brightness contrast, the color or brightness of a stimulus appears to shift toward the complementary (opposite) color or brightness of its surrounding region. Kaneko and colleagues proposed that simultaneous contrast involves separate "fast" and "slow" mechanisms, with stronger induction effects for fast than slow. Support for the model came from a diverse series of experiments showing that induction by surrounds varying in luminance or color was stronger for brief than long presentation times (10-40 vs. Read More

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September 2018

Relationship of Depth Adaptation Between Disparity-Specified Plaids and Their Components.

Iperception 2018 Sep-Oct;9(5):2041669518799763. Epub 2018 Sep 13.

School of Information, Kochi University of Technology, Japan.

In the luminance domain, studies show that perceived contrasts of plaids are a nonlinear summation of their components. In the disparity domain, perceived depth has been studied by using a depth adaptation paradigm with simple surfaces; however, the relationship between depth adaptation between plaids and their components has not been investigated. To clarify this, combinations of disparity-defined horizontal corrugation (marked as ) and disparity-defined plaids as adaptor-probe pairs were used. Read More

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September 2018

The Power of Shape: How Shape of Node-Link Diagrams Impacts Aesthetic Appreciation and Triggers Interest.

Iperception 2018 Sep-Oct;9(5):2041669518796851. Epub 2018 Sep 8.

Institute for Theoretical Informatics, Karlsruhe Institute of Technology, Germany.

Positive effects of aesthetically appreciated designs have long been studied and confirmed since the 19th century: such designs are more enjoyable, they are more forgivable for glitches and can increase users' performance. In the field of information visualization, studies of aesthetics are still a niche approach. In the current study, we aim to specifically understand which parameters in a visualization of node-link diagrams make them aesthetically pleasing-an important extension to already existing research on usability and readability aspects. Read More

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September 2018

An Introduction to the Special Issue "Seeing Colors".

Iperception 2018 Sep-Oct;9(5):2041669518797392. Epub 2018 Sep 4.

University of Regensburg, Germany.

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September 2018

The Role of Visual Information in Body Size Estimation.

Iperception 2018 Sep-Oct;9(5):2041669518796853. Epub 2018 Sep 5.

Max Planck Institute for Biological Cybernetics, Tübingen, Germany.

The conscious representation of our physical appearance is important for many aspects of everyday life. Here, we asked whether different visual experiences of our bodies influence body width estimates. In Experiment 1, width estimates of three body parts (foot, hips, and shoulders) without any visual access were compared to estimates with visual feedback available in a mirror or from a first-person perspective. Read More

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September 2018

Chasing Animals With Split Attention: Are Animals Prioritized in Visual Tracking?

Iperception 2018 Sep-Oct;9(5):2041669518795932. Epub 2018 Sep 3.

Department of Psychology, University of Oslo, Norway.

Some evolutionary psychologists have hypothesized that animals have priority in human attention. That is, they should be detected and selected more efficiently than other types of objects, especially man-made ones. Such a priority mechanism should automatically deploy more attentional resources and dynamic monitoring toward animal stimuli than nonanimals. Read More

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September 2018

Amodal Completion of a Target Template Enhances Attentional Guidance in Visual Search.

Iperception 2018 Jul-Aug;9(4):2041669518796240. Epub 2018 Aug 30.

Ludwig-Maximilians-Universität München, Germany.

When searching for a target object in cluttered environments, our visual system appears to complete missing parts of occluded objects-a mechanism known as "amodal completion." This study investigated how different variants of completion influence visual search for an occluded target object. In two experiments, participants searched for a target among distractors in displays that either presented composite objects (notched shapes abutting an occluding square) or corresponding simple objects. Read More

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Delving Deeper Into Color Space.

Iperception 2018 Jul-Aug;9(4):2041669518792062. Epub 2018 Aug 23.

SND/CNRS/Sorbonne University, Paris, France.

So far, color-naming studies have relied on a rather limited set of color stimuli. Most importantly, stimuli have been largely limited to highly saturated colors. Because of this, little is known about how people categorize less saturated colors and, more generally, about the structure of color categories as they extend across all dimensions of color space. Read More

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August 2018
7 Reads

Battle of the Mondrians: Investigating the Role of Unpredictability in Continuous Flash Suppression.

Iperception 2018 Jul-Aug;9(4):2041669518792930. Epub 2018 Aug 22.

Department of Psychology, Vanderbilt University, Nashville, TN, USA.

In continuous flash suppression (CFS), a dynamic sequence of Mondrian patterns presented to one eye suppresses a static target in the other eye for several seconds at a time. Its effectiveness has been linked to low-level properties such as spatial frequency and orientation, but the role of higher order influences remains unstudied. Here, using a tracking paradigm, we asked if the spatial and temporal predictability of the Mondrian sequence affects CFS dynamics. Read More

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August 2018
7 Reads

Area Dominates Edge in Pointillistic Colour.

Iperception 2018 Jul-Aug;9(4):2041669518788582. Epub 2018 Aug 14.

Justus-Liebig Universität Giessen, Germany.

In Pointillism and Divisionism, artists moved from tonal to chromatic palettes, as Impressionism did before them, and relied on what is often called optical mixture instead of stirring paints together. The so-called optical mixture is actually not an optical mixture, but a mental blend, because the texture of the paint marks is used as a means to stress the picture plane. The touches are intended to remain separately visible. Read More

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August 2018
5 Reads

Differences in the Magnitude of Representational Momentum Between School-Aged Children and Adults as a Function of Experimental Task.

Iperception 2018 Jul-Aug;9(4):2041669518791191. Epub 2018 Aug 12.

Department of Health Promotion Sciences, Tokyo Metropolitan University, Japan.

Representational momentum (RM) is the phenomenon that occurs when an object moves and then disappears, and the recalled final position of the object shifts in the direction of its motion. Some previous findings indicate that the magnitude of RM in early childhood is comparable to that in adulthood, whereas other findings suggest that the magnitude of RM is significantly greater in childhood than in adulthood. We examined whether the inconsistencies between previous studies could be explained by differences in the experimental tasks used in these studies. Read More

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Amodal Presence and the Bounce/Stream Illusion.

Authors:
Stuart Anstis

Iperception 2018 Jul-Aug;9(4):2041669518791833. Epub 2018 Aug 7.

Department of Psychology, UC San Diego, La Jolla, CA, USA.

Ambiguous bounce/stream collision points were hidden behind an occluder so that observers had to complete them amodally. In Movie 1, straight or curved static lines were painted on the occluder. In Movie 2, dotted textures flowed in straight or curved lines across the front of the occluder. Read More

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August 2018
6 Reads

Assumed Lighting Direction in the Interpretation of Cast Shadows.

Iperception 2018 Jul-Aug;9(4):2041669518790576. Epub 2018 Jul 31.

Japan Society for the Promotion of Science, Tokyo, Japan; Research Center for Applied Perceptual Science, Kyushu University, Fukuoka, Japan.

Assumed lighting direction in cast-shadow interpretation was investigated. Experiment 1 used an ambiguous object-shadow-matching task to measure bias in shadow-matching direction. The shadow-matching bias was largest when the lighting direction was on average 38. Read More

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July 2018
5 Reads

The Importance of Amodal Completion in Everyday Perception.

Authors:
Bence Nanay

Iperception 2018 Jul-Aug;9(4):2041669518788887. Epub 2018 Jul 31.

University of Antwerp, Belgium; Peterhouse, Cambridge University, UK.

Amodal completion is the representation of those parts of the perceived object that we get no sensory stimulation from. In the case of vision, it is the representation of occluded parts of objects we see: When we see a cat behind a picket fence, our perceptual system represents those parts of the cat that are occluded by the picket fence. The aim of this piece is to argue that amodal completion plays a constitutive role in our everyday perception and trace the theoretical consequences of this claim. Read More

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July 2018
7 Reads

The Sequential-Weight Illusion.

Iperception 2018 Jul-Aug;9(4):2041669518790275. Epub 2018 Jul 25.

Department of Experimental Psychology, University of Giessen, Germany.

We report an illusion in which the felt weight of an object changes depending on whether a previously manipulated object was lighter or heavier. The illusion is not modulated by visual weight cues, yet it transfers across hands. Read More

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July 2018
7 Reads

Streaming, Bouncing, and Rotation: The Polka Dance Stimulus.

Iperception 2018 Jul-Aug;9(4):2041669518777259. Epub 2018 Jul 4.

Kyushu University, Fukuoka, Japan.

When the objects in a typical stream-bounce stimulus are made to rotate on a circular trajectory, not two but four percepts can be observed: streaming, bouncing, clockwise rotation, and counterclockwise rotation, often with spontaneous reversals between them. When streaming or bouncing is perceived, the objects seem to move on individual, opposite trajectories. When rotation is perceived, however, the objects seem to move in unison on the same circular trajectory, as if constituting the edges of a virtual pane that pivots around its axis. Read More

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July 2018
8 Reads

Face-Inversion Effect on Disgust Evoked by a Cluster of Dots.

Iperception 2018 May-Jun;9(3):2041669518784960. Epub 2018 Jun 27.

Faculty of Art and Design, University of Tsukuba, Japan; Graduate School of Engineering, Chiba University, Japan.

A cluster of dots such as lotus seed pods evokes extremely strong disgust when it is placed on human and animal skins. However, few empirical studies have examined the role of the background image, such as skin, in the generation of disgust. In this study, we investigated whether the orientation of background faces influences the disgust evoked by the dot pattern. Read More

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June 2018
10 Reads

Vision-Driven Kinesthetic Illusion in Mirror Visual Feedback.

Iperception 2018 May-Jun;9(3):2041669518782994. Epub 2018 Jun 24.

Nagoya City University, Nagoya, Aichi, Japan.

In the paradigm of mirror visual feedback, it remains unclear how images of the mirrored hand directly affect the sense of motion of the hidden hand (kinesthetic illusion). To examine this question, we created an original mirror visual feedback setup using a horizontal mechanism of motion for the mirror and the hidden hand, each of which could independently be given a specific velocity. It should be noted that this setup can cause the hand viewed in the mirror to move without the involvement of the visible hand. Read More

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June 2018
7 Reads

Amodal Volume Completion and the Thin Building Illusion.

Iperception 2018 May-Jun;9(3):2041669518781875. Epub 2018 Jun 27.

Laboratory of Experimental Psychology, University of Leuven (KU Leuven), Belgium.

We report results from an experiment showing that a tall pillar with a triangular base evokes radically different three-dimensional (3D) percepts depending on the vantage point from which it is observed. The base of the pillar is an isosceles right triangle, but the pillar is perceived as just a thin plane when viewed from some vantage points. Viewed from other vantage points, the perceived 3D shape of the pillar corresponds to a square or rectangular base. Read More

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June 2018
1 Read

Visual Light Zones.

Iperception 2018 May-Jun;9(3):2041669518781381. Epub 2018 Jun 27.

Perceptual Intelligence Lab, Delft University of Technology, the Netherlands.

In this article, we studied perception of a particular case of light fields that is characterized by a difference in its consistent structure between parts of a scene. In architectural lighting design, such a consistent structure in a part of a light field is called a light zone. First, we explored whether human observers are sensitive to light zones, that is, zones determined primarily by light flow differences, for a natural-looking scene. Read More

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June 2018
8 Reads

Diamond Patterns: Cumulative Cornsweet Effects and Motion-Induced Brightening.

Iperception 2018 Jul-Aug;9(4):2041669518770690. Epub 2018 Jul 12.

Department of Psychology, University of California, San Diego, La Jolla, CA, USA.

A Cornsweet edge creates the perception of a step in surface lightness between two adjacent regions of identical mean luminance due to a gradient on both sides. We might imagine that in a concatenated set of these gradients, the lightness steps would accumulate, but they do not. However, a diamond pattern, with each diamond filled with an identical luminance gradient does give a cumulative Cornsweet effect. Read More

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July 2018
4 Reads

The Influence of Physical Illumination on Lightness Perception in Simultaneous Contrast Displays.

Iperception 2018 Jul-Aug;9(4):2041669518787212. Epub 2018 Jul 19.

Department of Psychology, University of California, Los Angeles, USA.

Three experiments investigated the role of physical illumination on lightness perception in simultaneous lightness contrast (SLC). Four configurations were employed: the classic textbook version of the illusion and three configurations that produced either enhanced or reduced SLC. Experiment 1 tested the effect of ambient illumination on lightness perception. Read More

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July 2018
6 Reads

Vanishing Girls, Mysterious Blacks.

Iperception 2018 Jul-Aug;9(4):2041669518786740. Epub 2018 Jul 20.

Laboratory of Experimental Psychology, University of Leuven (KU Leuven), Belgium.

Participants had to indicate the location of points on what might be called "amodal contours" in some works of art. The works represented mutually quite different cases. In one case, there were not even scattered modal cues, thus the amodal contour had to be hallucinated on the basis of generic familiarity. Read More

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July 2018
4 Reads

Vection Is Enhanced by Increased Exposure to Optic Flow.

Iperception 2018 May-Jun;9(3):2041669518774069. Epub 2018 May 23.

School of Psychology, University of Wollongong, Wollongong, NSW, Australia.

We examined whether vection strength could be modulated by altering the exposure duration to optic flow. Experiment 1 sourced 150 different video clips from various Japanese animation works which simulated self-motion. Despite large differences in the content of these video clips, we found a significant positive correlation between their play durations and their ratings of vection magnitude. Read More

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May 2018
13 Reads

Rapid Facial Reactions in Response to Facial Expressions of Emotion Displayed by Real Versus Virtual Faces.

Iperception 2018 Jul-Aug;9(4):2041669518786527. Epub 2018 Jul 12.

LIMSI, CNRS, University of Paris-Sud, Orsay, France.

Facial expressions of emotion provide relevant cues for understanding social interactions and the affective processes involved in emotion perception. Virtual human faces are useful for conducting controlled experiments. However, little is known regarding the possible differences between physiological responses elicited by virtual versus real human facial expressions. Read More

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July 2018
2 Reads

Spatial Representation of the Workspace in Blind, Low Vision, and Sighted Human Participants.

Iperception 2018 May-Jun;9(3):2041669518781877. Epub 2018 Jun 17.

Department of Human Movement Sciences, Vrije Universiteit Amsterdam, the Netherlands.

It has been proposed that haptic spatial perception depends on one's visual abilities. We tested spatial perception in the workspace using a combination of haptic matching and line drawing tasks. There were 132 participants with varying degrees of visual ability ranging from congenitally blind to normally sighted. Read More

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June 2018
7 Reads

Parallel Behind Your Head.

Iperception 2018 May-Jun;9(3):2041669518781141. Epub 2018 Jun 13.

VU Amsterdam, the Netherlands.

A miniature hair clip set-up presented to the first author gave inspiration for this study. After a number of studies investigating what is haptically perceived as parallel on horizontal, frontoparallel or midsagittal planes, the present study focusses on what is felt as parallel behind your head. The results show convincingly that also in this condition physically parallel is not the same as haptically parallel. Read More

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Effects of Users' Familiarity With the Objects Depicted in Icons on the Cognitive Performance of Icon Identification.

Iperception 2018 May-Jun;9(3):2041669518780807. Epub 2018 Jun 11.

School of Mechanical Engineering, Southeast University, Nanjing, China.

This study investigated the effects of users' familiarity with the objects depicted in icons on the cognitive performance of icon identification. First, without knowing the specific semantic information of icons, 20 participants were required to search for target icons among visually similar distractors for 3-hour-long training sessions across 1 week, during which their familiarity with different icons was manipulated by differential exposure frequencies. Half of the icons were presented 10 times more often than the other half. Read More

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June 2018
6 Reads

Gist Perception of Image Composition in Abstract Artworks.

Iperception 2018 May-Jun;9(3):2041669518780797. Epub 2018 Jun 13.

Experimental Aesthetics Group, Institute of Anatomy I, University of Jena School of Medicine, Germany; Laboratory of Experimental Psychology, Brain & Cognition, University of Leuven (KU Leuven), Belgium.

Most recent studies in experimental aesthetics have focused on the cognitive processing of visual artworks. In contrast, the perception of formal compositional features of artworks has been studied less extensively. Here, we investigated whether fast and automatic processing of artistic image composition can lead to a stable and consistent aesthetic evaluation when cognitive processing is minimized or absent. Read More

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June 2018
17 Reads

Gray Bananas and a Red Letter A - From Synesthetic Sensation to Memory Colors.

Iperception 2018 May-Jun;9(3):2041669518777515. Epub 2018 May 31.

University of Regensburg, Germany.

Grapheme-color synesthesia is a condition in which objectively achromatic graphemes induce concurrent color experiences. While it was long thought that the colors emerge during perception, there is growing support for the view that colors are integral to synesthetes' cognitive representations of graphemes. In this work, we review evidence for two opposing theories positing either a perceptual or cognitive origin of concurrent colors: the cross-activation theory and the conceptual-mediation model. Read More

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May 2018
11 Reads

Ewald Hering's (1899) On the Limits of Visual Acuity: A Translation and Commentary: With a Supplement on Alfred Volkmann's (1863) Physiological Investigations in the Field of Optics.

Iperception 2018 May-Jun;9(3):2041669518763675. Epub 2018 Jun 4.

School of Psychology, University of Surrey, Guildford, Surrey, UK.

Towards the end of the 19th Century, Hering and Helmholtz were arguing about the fineness of visual acuity. In a talk given in 1899, Hering finally established beyond reasonable doubt that humans can see spatial displacements smaller than the diameter of a foveal cone receptor, an ability we nowadays call 'hyperacuity' and still the topic of active research. Hering suggested that this ability is made manifest by averaging across the range of locations stimulated during miniature eye movements. Read More

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June 2018
9 Reads

Being Hungry Affects Oral Size Perception.

Iperception 2018 May-Jun;9(3):2041669518777513. Epub 2018 May 22.

Missouri School of Dentistry and Oral Health, A.T. Still University, Kirksville, MO, USA.

Oral size perception is not veridical, and there is disagreement on whether this nonveridicality tends to underestimate or overestimate size. Further, being hungry has been shown to affect oral size perception. In this study, we investigated the effect of hunger on oral size perception. Read More

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Blindness to Curvature and Blindness to Illusory Curvature.

Iperception 2018 May-Jun;9(3):2041669518776986. Epub 2018 May 24.

Department of Psychology, Ritsumeikan University, Kyoto, Japan.

We compare two versions of two known phenomena, the and the illusions, to highlight how similar manipulations lead to blindness to curvature and blindness to illusory curvature, respectively. The critical factor is a change in luminance polarity; this factor interferes with the computation of curvature along the contour, for both real and illusory curvature. Read More

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May 2018
5 Reads

Human Echolocation for Target Detection Is More Accurate With Emissions Containing Higher Spectral Frequencies, and This Is Explained by Echo Intensity.

Authors:
L J Norman L Thaler

Iperception 2018 May-Jun;9(3):2041669518776984. Epub 2018 May 22.

Department of Psychology, Durham University, Durham, UK.

Humans can learn to use acoustic echoes to detect and classify objects. Echolocators typically use tongue clicks to induce these echoes, and there is some evidence that higher spectral frequency content of an echolocator's tongue click is associated with better echolocation performance. This may be explained by the intensity of the echoes. Read More

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May 2018
5 Reads

View From Outside the Viewing Sphere.

Iperception 2018 May-Jun;9(3):2041669518774806. Epub 2018 May 23.

Cardiff Metropolitan University, Wales, UK.

The 'viewing sphere', as defined by Euclid and explored by Gibson as the 'optic array', is generally thought of as wrapped around the eye. Can an observer step out of it? With currently popular photographic techniques, the spectator is forced to, because the viewing sphere is presented as a pictorial object. Then the question is whether human observers are able to use such pictorial representations in an intuitive manner. Read More

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Pupillary Responses to Illusions of Brightness in Autism Spectrum Disorder.

Iperception 2018 May-Jun;9(3):2041669518771716. Epub 2018 May 17.

Department of Psychology, University of Oslo, Norway.

Previous studies indicate that individuals with autism spectrum disorder (ASD) do not experience optical illusions in the same manner as individuals with typical development. This study uses pupillary responses as an objective measure of perception of visual illusions, with the hypothesis that adults with ASD will show weaker pupillary constrictions to the illusions than adults without ASD. An eye-tracker was used to investigate the spontaneous pupillary changes to brightness illusions in adults diagnosed with ASD ( = 11) and in a control group ( = 24). Read More

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Magic Circle.

Iperception 2018 May-Jun;9(3):2041669518770691. Epub 2018 May 7.

University of Leuven (KU Leuven), Leuven, Belgium.

Full-horizon cylindrical projections of the optic array are in common use. One wonders whether the public actually profits from such pictorial information, since the space behind one's back does not exist in visual awareness. In an experiment, a test image included six persons located at the corners of an irregular hexagon centred at the camera. Read More

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May 2018
1 Read

Motion Masking by Stationary Objects: A Study of Simulated Saccades.

Iperception 2018 May-Jun;9(3):2041669518773111. Epub 2018 May 10.

Laboratoire Psychologie de la Perception - CNRS UMR 8242, Université Paris Descartes, Paris, France.

Saccades are crucial to visual information intake by re-orienting the fovea to regions of interest in the visual scene. However, they cause drastic disruptions of the retinal input by shifting the retinal image at very high speeds. The resulting motion and smear are barely noticed, a phenomenon known as saccadic omission. Read More

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May 2018
5 Reads

Line-Drawn Scenes Provide Sufficient Information for Discrimination of Threat and Mere Negativity.

Iperception 2018 Jan-Feb;9(1):2041669518755806. Epub 2018 Feb 12.

Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, MA, USA; Department of Radiology, Harvard Medical School, Boston, MA, USA.

Previous work using color photographic scenes has shown that human observers are keenly sensitive to different types of threatening and negative stimuli and reliably classify them by the presence, and spatial and temporal directions of threat. To test whether such distinctions can be extracted from impoverished visual information, we used 500 line drawings made by hand-tracing the original set of photographic scenes. Sixty participants rated the scenes on spatial and temporal dimensions of threat. Read More

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February 2018

Conflict Tasks of Different Types Divergently Affect the Attentional Processing of Gaze and Arrow.

Iperception 2018 May-Jun;9(3):2041669518771713. Epub 2018 May 7.

School of Psychology, Southwest University, Chongqing, China.

The present study explored the attentional processing mechanisms of gaze and arrow cues in two different types of conflict tasks. In Experiment 1, participants performed a flanker task in which gaze and arrow cues were presented as central targets or bilateral distractors. The congruency between the direction of the target and the distractors was manipulated. Read More

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May 2018
1 Read

Does Colour Filling-In Account for Colour Perception in Natural Images?

Iperception 2018 May-Jun;9(3):2041669518768829. Epub 2018 May 7.

City University of London, London, UK.

It is popular to attribute the appearance of extended colour fields to a process of filling-in from the differential colour signals at colour edges, where one colour transitions to another. We ask whether such a process can account for the appearance of extended colour fields in natural images. Some form of colour filling-in must underlie the equiluminant colour Craik-O'Brien-Cornsweet effect and the Watercolour Effect, but these effects are too weak to account for the appearance of extended colour fields in natural images. Read More

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May 2018
8 Reads

Human Body Odour Composites Are Not Perceived More Positively than the Individual Samples.

Iperception 2018 May-Jun;9(3):2041669518766367. Epub 2018 May 7.

Faculty of Science, Charles University, Prague, Czech Republic; National Institute of Mental Health, Klecany, Czech Republic.

It is well established that composite facial images are perceived as more attractive compared with individual images, suggesting a preference for heterozygosity. Similarly, there is evidence that preferences for body odours might be linked to heterozygosity. Here, we tested whether blending individual body odours into composites would follow a similar pattern as observed in the perception of faces. Read More

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May 2018
11 Reads