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I-Perception

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https://www.readbyqxmd.com/read/28228928/rotating-snakes-illusion-quantitative-analysis-reveals-a-region-in-luminance-space-with-opposite-illusory-rotation
#1
Lea Atala-Gérard, Michael Bach
The Rotating Snakes Illusion employs patterns with repetitive asymmetric luminance steps forming a "snake wheel." In the underlying luminance sequence {black, dark grey, white, light grey}, coded as {0, g1, 100, g2}, we varied g1 and g2 and measured illusion strength via nulling: Saccades were performed next to a "snake wheel" that rotated physically; observers adjusted rotation until a stationary percept obtained. Observers performed the perceptual nulling of the seeming rotation reliably. Typical settings for (g1, g2), measured from images by Kitaoka, are around (20%, 60%)...
January 2017: I-Perception
https://www.readbyqxmd.com/read/28210488/systematic-distortions-in-vertical-placement-of-features-in-drawings-of-faces-and-houses
#2
Neil R Harrison, Julia Jones, Simon J Davies
A crucial part of accurately drawing portraits is the correct vertical positioning of the eyes. Non-experts typically place the eyes higher on the head than they are actually located; however, the explanation for this remains unclear. In Experiment 1, participants drew faces from memory and directly copied from a photograph, to confirm whether biases in observational drawings were related to biases in memory-based drawings. In Experiment 2, participants drew a cat's face, to test explanations by Carbon and Wirth for the positional bias: the 'view-from-below, the 'head-as-box', and the 'hair-as-hat' explanations...
January 2017: I-Perception
https://www.readbyqxmd.com/read/28210487/erratum-to-an-easy-way-to-show-memory-color-effects
#3
(no author information available yet)
[This corrects the article DOI: 10.1177/2041669516663751.].
January 2017: I-Perception
https://www.readbyqxmd.com/read/28210486/touch-accelerates-visual-awareness
#4
Claudia Lunghi, Luca Lo Verde, David Alais
To efficiently interact with the external environment, our nervous system combines information arising from different sensory modalities. Recent evidence suggests that cross-modal interactions can be automatic and even unconscious, reflecting the ecological relevance of cross-modal processing. Here, we use continuous flash suppression (CFS) to directly investigate whether haptic signals can interact with visual signals outside of visual awareness. We measured suppression durations of visual gratings rendered invisible by CFS either during visual stimulation alone or during visuo-haptic stimulation...
January 2017: I-Perception
https://www.readbyqxmd.com/read/28210485/directional-bias-in-the-perception-of-cast-shadows
#5
Tomomi Koizumi, Hiroyuki Ito, Shoji Sunaga, Masaki Ogawa
Previous studies have demonstrated that the perception of shading is based upon assumptions about lighting direction, for example, light from above. However, it is not clear whether these assumptions are used in the perception of cast shadows. Moreover, it is unclear whether a perceptual interaction exists between shading and cast shadows because until now they have been studied separately. In this study, we investigated through three experiments whether the light-from-above (or another direction) assumption is used in interpreting ambiguous cast shadows, and whether shading information influences the interpretation of cast shadows...
January 2017: I-Perception
https://www.readbyqxmd.com/read/28203355/who-is-the-usual-suspect-evidence-of-a-selection-bias-toward-faces-that-make-direct-eye-contact-in-a-lineup-task
#6
Jessica Taubert, Celine van Golde, Frans A J Verstraten
The speed and ease with which we recognize the faces of our friends and family members belies the difficulty we have recognizing less familiar individuals. Nonetheless, overconfidence in our ability to recognize faces has carried over into various aspects of our legal system; for instance, eyewitness identification serves a critical role in criminal proceedings. For this reason, understanding the perceptual and psychological processes that underlie false identification is of the utmost importance. Gaze direction is a salient social signal and direct eye contact, in particular, is thought to capture attention...
January 2017: I-Perception
https://www.readbyqxmd.com/read/28203354/the-graphesthesia-paradigm-drawing-letters-on-the-body-to-investigate-the-embodied-nature-of-perspective-taking
#7
Gabriel Arnold, Malika Auvray
In this study, we investigated whether adopting a head-centered perspective on the body is an embodied process by means of the graphesthesia task. This task consists of interpreting ambiguous tactile symbols from different spatial perspectives. The results revealed that symbols were more easily recognized when the mental rotation of the head toward the stimulated surface corresponded to physically possible, as opposed to impossible, body movements. Performance also decreased with increasing the amount of body movements that would be necessary to physically rotate the head...
January 2017: I-Perception
https://www.readbyqxmd.com/read/28203353/auditory-stimulus-detection-partially-depends-on-visuospatial-attentional-resources
#8
Basil Wahn, Supriya Murali, Scott Sinnett, Peter König
Humans' ability to detect relevant sensory information while being engaged in a demanding task is crucial in daily life. Yet, limited attentional resources restrict information processing. To date, it is still debated whether there are distinct pools of attentional resources for each sensory modality and to what extent the process of multisensory integration is dependent on attentional resources. We addressed these two questions using a dual task paradigm. Specifically, participants performed a multiple object tracking task and a detection task either separately or simultaneously...
January 2017: I-Perception
https://www.readbyqxmd.com/read/28203352/a-glossy-simultaneous-contrast-conjoint-measurements-of-gloss-and-lightness
#9
Sabrina Hansmann-Roth, Pascal Mamassian
Interactions between the albedo and the gloss on a surface are commonplace. Darker surfaces are perceived glossier (contrast gloss) than lighter surfaces and darker backgrounds can enhance perceived lightness of surfaces. We used maximum likelihood conjoint measurements to simultaneously quantify the strength of those effects. We quantified the extent to which albedo can influence perceived gloss and physical gloss can influence perceived lightness. We modeled the contribution of lightness and gloss and found that increasing lightness reduced perceived gloss by about 32% whereas gloss had a much weaker influence on perceived lightness of about 12%...
January 2017: I-Perception
https://www.readbyqxmd.com/read/28203351/pink-cricket-balls-may-be-visually-challenging-at-sunset
#10
Joshua M Adie, Derek H Arnold
Cricket is one of the world's most popular sports, followed by hundreds of millions of people. It can be dangerous, played with a hard ball flying at great velocities, and accidents have occasionally been fatal. Traditionally, cricket has been played during the day, using a dark red ball. Since the late 1970s, a shorter form of one-day cricket has been played both during the day and at night under floodlights. To overcome visibility issues, one-day cricket uses a white ball, and players wear coloured clothing...
January 2017: I-Perception
https://www.readbyqxmd.com/read/28203350/separate-and-simultaneous-adjustment-of-light-qualities-in-a-real-scene
#11
Ling Xia, Sylvia C Pont, Ingrid Heynderick
Humans are able to estimate light field properties in a scene in that they have expectations of the objects' appearance inside it. Previously, we probed such expectations in a real scene by asking whether a "probe object" fitted a real scene with regard to its lighting. But how well are observers able to interactively adjust the light properties on a "probe object" to its surrounding real scene? Image ambiguities can result in perceptual interactions between light properties. Such interactions formed a major problem for the "readability" of the illumination direction and diffuseness on a matte smooth spherical probe...
January 2017: I-Perception
https://www.readbyqxmd.com/read/28203349/depth-perception-and-the-history-of-three-dimensional-art-who-produced-the-first-stereoscopic-images
#12
Kevin R Brooks
The history of the expression of three-dimensional structure in art can be traced from the use of occlusion in Palaeolithic cave paintings, through the use of shadow in classical art, to the development of perspective during the Renaissance. However, the history of the use of stereoscopic techniques is controversial. Although the first undisputed stereoscopic images were presented by Wheatstone in 1838, it has been claimed that two sketches by Jacopo Chimenti da Empoli (c. 1600) can be to be fused to yield an impression of stereoscopic depth, while others suggest that Leonardo da Vinci's Mona Lisa is the world's first stereogram...
January 2017: I-Perception
https://www.readbyqxmd.com/read/28096972/objects-versus-shadows-as-influences-on-perceived-object-motion
#13
Marouane Ouhnana, Frederick A A Kingdom
The motion trajectory of an object's cast shadow has been shown to alter the perceived trajectory of a casting object, an effect that holds even if the cast shadow appears unrealistic. This raises the question of whether a cast shadow per se is necessary for this influence, a question that has been studied only with stationary targets. We examined the relative influence of a shadow and a spherical object on the perceived motion trajectory of an identical spherical object, using a paradigm similar to Kersten, Mamassian, and Knill's ball-in-box animation...
November 2016: I-Perception
https://www.readbyqxmd.com/read/27994845/crossmodal-modulation-of-spatial-localization-by-mimetic-words
#14
Akihiko Gobara, Yuki Yamada, Kayo Miura
The present study investigated whether aurally presented mimetic words affect the judgment of the final position of a moving object. In Experiment 1, horizontal apparent motion of a visual target was presented, and an auditory mimetic word of "byun" (representing rapid forward motion), "pitari" (representing stop of motion), or "nisahi" (nonsense syllable) was presented via headphones. Observers were asked to judge which of two test stimuli was horizontally aligned with the target. The results showed that forward displacement in the "pitari" condition was significantly smaller than in the "byun" and "nisahi" conditions...
November 2016: I-Perception
https://www.readbyqxmd.com/read/27994844/circling-around-the-uncanny-valley-design-principles-for-research-into-the-relation-between-human-likeness-and-eeriness
#15
REVIEW
Stephanie Lay, Nicola Brace, Graham Pike, Frank Pollick
The uncanny valley effect (UVE) is a negative emotional response experienced when encountering entities that appear almost human. Research on the UVE typically investigates individual, or collections of, near human entities but may be prone to methodological circularity unless the properties that give rise to the emotional response are appropriately defined and quantified. In addition, many studies do not sufficiently control the variation in human likeness portrayed in stimulus images, meaning that the nature of stimuli that elicit the UVE is also not well defined or quantified...
November 2016: I-Perception
https://www.readbyqxmd.com/read/27994843/the-role-of-vertical-disparity-in-distance-and-depth-perception-as-revealed-by-different-stereo-camera-configurations
#16
Cyril Vienne, Justin Plantier, Pascaline Neveu, Anne-Emmanuelle Priot
Vertical binocular disparity is a source of distance information allowing the portrayal of the layout and 3D metrics of the visual space. The role of vertical disparity in the perception of depth, size, curvature, or slant of surfaces was revealed in several previous studies using cue conflict paradigms. In this study, we varied the configuration of stereo-cameras to investigate how changes in the horizontal and vertical disparity fields, conflicting with the vergence cue, affect perceived distance and depth...
November 2016: I-Perception
https://www.readbyqxmd.com/read/27928495/a-new-version-of-the-beuchet-chair-illusion
#17
Richard Wiseman
The Beuchet Chair is a powerful and highly popular optical illusion. The illusion involves two reasonably large pieces of apparatus: an oversized chair seat and four normal-sized chair legs. When properly arranged and viewed from a precise location, a person standing on the seat appears to be much smaller than they actually are. Although compelling, the illusion is relatively challenging and expensive to construct, requires a large amount of space to stage, and is not especially portable. Here, I outline a new version of the illusion that just involves a small piece of cardboard, a cloth, and a tripod...
November 2016: I-Perception
https://www.readbyqxmd.com/read/27895887/symmetry-lasts-longer-than-random-but-only-for-brief-presentations
#18
Ruth Ogden, Alexis D J Makin, Letizia Palumbo, Marco Bertamini
Previous research has shown that explicit emotional content or physical image properties (e.g., luminance, size, and numerosity) alter subjective duration. Palumbo recently demonstrated that the presence or absence of abstract reflectional symmetry also influenced subjective duration. Here, we explored this phenomenon further by varying the type of symmetry (reflection or rotation) and the objective duration of stimulus presentation (less or more than 1 second). Experiment 1 used a verbal estimation task in which participants estimated the presentation duration of reflection, rotation symmetry, or random square-field patterns...
November 2016: I-Perception
https://www.readbyqxmd.com/read/27895886/back-to-the-ussr-how-colors-might-shape-the-political-perception-of-east-versus-west
#19
Fabian Gebauer, Marius H Raab, Claus-Christian Carbon
People typically process information to confirm their prior held attitudes and stereotypes. As the political relations between NATO and Russia have distinctively drifted apart in recent years, we were interested in how far old-established color depictions referring to the Cold War's demarcations (USSR = red; NATO = blue) might reinforce people's political perception of an East versus West antagonism nowadays. Participants received a fabricated news article in which both world powers were either depicted on a map as Russia = red and NATO = blue or vice versa (Study 1)...
November 2016: I-Perception
https://www.readbyqxmd.com/read/27895885/facing-the-spectator
#20
Jan Koenderink, Andrea van Doorn, Baingio Pinna, Robert Pepperell
We investigated the familiar phenomenon of the uncanny feeling that represented people in frontal pose invariably appear to "face you" from wherever you stand. We deploy two different methods. The stimuli include the conventional one-a flat portrait rocking back and forth about a vertical axis-augmented with two novel variations. In one alternative, the portrait frame rotates whereas the actual portrait stays motionless and fronto-parallel; in the other, we replace the (flat!) portrait with a volumetric object...
November 2016: I-Perception
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