scholarly journals The role of auditory distance information in visual size perception

2020 ◽  
Vol 41 (1) ◽  
pp. 331-333
Author(s):  
Daiki Yamasaki ◽  
Hiroshi Ashida
Keyword(s):  
Size Perception ◽  
Distance Information ◽  
Auditory Distance ◽  
Visual Size

Size–Distance Scaling With Absolute and Relative Auditory Distance Information

2020 ◽  
Vol 33 (1) ◽  
pp. 109-126
Author(s):  
Daiki Yamasaki ◽  
Hiroshi Ashida
Keyword(s):  
Size Perception ◽  
Relative Distance ◽  
Size Estimation ◽  
Absolute Distance ◽  
Distance Information ◽  
Auditory Distance ◽  
3D Space ◽  
Visual Spatial ◽  
Sound Sequence ◽  
Visual Size

Abstract In the dynamic 3D space, it is critical for survival to perceive size of an object and rescale it with distance from an observer. Humans can perceive distance via not only vision but also audition, which plays an important role in the localization of objects, especially in visually ambiguous environments. However, whether and how auditory distance information contributes to visual size perception is not well understood. To address this issue, we investigated the efficiency of size–distance scaling by using auditory distance information that was conveyed by binaurally recorded auditory stimuli. We examined the effects of absolute distance information of a single sound sequence (Experiment 1) and relative distance information between two sound sequences (Experiment 2) on visual size estimation performances in darkened and well-lit environments. We demonstrated that humans could perform size–distance disambiguation by using auditory distance information even in darkness. Curiously, relative distance information was more efficient in size–distance scaling than absolute distance information, suggesting a high reliance on relative auditory distance information in our visual spatial experiences. The results highlight a benefit of audiovisual interaction for size–distance processing and calibration of external events under visually degraded situations.

A motor signal and ?visual? size perception

1996 ◽  
Vol 110 (3) ◽  
Author(s):  
DavidP. Carey ◽  
Kevin Allan
Keyword(s):  
Size Perception ◽  
Motor Signal ◽  
Visual Size

scholarly journals Development of a sensory and perceptual assessment test for psychosis and schizophrenia

2020 ◽  
Author(s):  
Maria Lucia de Bustamante Simas ◽  
Ana Cristina Taunay C. A. Maranhão ◽  
Flora Silva Teixeira ◽  
Aline Mendes Lacerda ◽  
Carlos Henrique Resende Freire ◽  
...  
Keyword(s):  
Assessment Tool ◽  
Size Perception ◽  
Psychotic Symptoms ◽  
Control Group ◽  
Salvador Dali ◽  
Ex Post ◽  
Perceptual Test ◽  
Quasi Experimental ◽  
Visual Size ◽  
Experimental Group

Results from the development of a novel sensory and perceptual test to assess the level of altered visual size perception in people with schizophrenia are presented. Here we compare the performances in a visual sensory and perceptual test between a control group and an experimental group of people diagnosed with schizophrenia. We have been using paintings by Salvador Dalí and Rorschach plates to assess images size perception. In this transversal, ex-post-fact and quasi-experimental study we show differences between EG (Experimental Group) and CG (Control Group). Schizophrenics in-patients as compared to controls perceived sizes about 1.3 fold greater than healthy volunteers (p=0.006), thus showing that size perception is altered in schizophrenia. Together with previous results, this particular sensory test for size perception seems to be a useful assessment tool to evaluate the degree and severity of psychotic symptoms in prodromal schizophrenic states, and neuropsychiatric patients in general. It may help prevent acute crisis with proper, and most likely, lower dosages of medication.

Obstacle Avoidance of Omnidirectional Intelligent Wheelchair Based on Multi-Sensors

2015 ◽  
Vol 742 ◽  
pp. 590-593 ◽  
Author(s):  
Xiu Zhi Li ◽  
Zhao Liu ◽  
Song Min Jia
Keyword(s):  
Obstacle Avoidance ◽  
Information Fusion ◽  
Visual Information ◽  
Distance Information ◽  
Wheelchair Users ◽  
Optical Flow Method ◽  
Intelligent Wheelchair ◽  
Handicapped People ◽  
Relevant Community

As the number of handicapped people increases worldwidely, the role of electric wheelchair becomes important to enhance their mobility. In the relevant community, attention is mainly directed to how to solve the problems in motion control for the wheelchair users, and scarce reports have appeared concerning obstacle avoidance of wheelchair. In this paper, we present a new method of obstacle avoidance for omnidirectional intelligent wheelchair bases on multi-sensors information fusion. Distance information acquired from ultrasonic sensors and visual information acquired from monocular camera are combined together, in which optical flow method is employed to distinguish obstacles. Extensive experiments have been conducted in the laboratory. As shown in experimental results that, the developed omnidirectional intelligent wheelchair works correctly and effectively in obstacle avoidance.

Size Discrimination with Low Spatial Frequencies

Perception ◽  
1982 ◽  
Vol 11 (6) ◽  
pp. 707-720 ◽  
Author(s):  
Robert A Smith
Keyword(s):  
Fourier Spectrum ◽  
Low Frequency ◽  
Current Theory ◽  
Size Perception ◽  
Size Discrimination ◽  
Low Frequencies ◽  
Spatial Frequencies ◽  
Vertical Bars ◽  
The Fourier Transform ◽  
Visual Size

The hypothesis that visual size is determined from the low-frequency Fourier spectrum of the image has been tested in a variety of ways. The fact that size discrimination of vertical bars is unimpaired when high spatial frequencies are filtered out of the image by blurring, and the fact that spatial-frequency adaptation alters perceived size, argue in favor of such hypothesis. However, the hypothesis is weakened by the observation that discrimination is also unimpaired by filtering low frequencies out of the image and by the observation that some manipulations which alter the Fourier transform produce no corresponding perceptual change. No current theory of size perception appears to fit all of these data.

scholarly journals The Mechanisms of Size Constancy

2015 ◽  
Vol 28 (3-4) ◽  
pp. 253-283 ◽  
Author(s):  
Irene Sperandio ◽  
Irene Sperandio ◽  
Philippe A. Chouinard
Keyword(s):  
Visual Experience ◽  
Distance Perception ◽  
Brain Area ◽  
Size Perception ◽  
Retinal Images ◽  
Size Constancy ◽  
Constant Size ◽  
Sensory Modalities ◽  
The Brain

Size constancy is the result of cognitive scaling operations that enable us to perceive an object as having the same size when presented at different viewing distances. In this article, we review the literature on size and distance perception to form an overarching synthesis of how the brain might combine retinal images and distance cues of retinal and extra-retinal origin to produce a perceptual visual experience of a world where objects have a constant size. A convergence of evidence from visual psychophysics, neurophysiology, neuropsychology, electrophysiology and neuroimaging highlight the primary visual cortex (V1) as an important node in mediating size–distance scaling. It is now evident that this brain area is involved in the integration of multiple signals for the purposes of size perception and does much more than fulfil the role of an entry position in a series of hierarchical cortical events. We also discuss how information from other sensory modalities can also contribute to size–distance scaling and shape our perceptual visual experience.

Changes in visual size perception in Schizophrenia and Depression

2020 ◽  
Vol 14 (4) ◽  
pp. 140-153
Author(s):  
Aline Mendes Lacerda ◽  
Maria Lúcia De Bustamante Simas ◽  
Geórgia Mônica Marques de Menezes
Keyword(s):  
Visual Angle ◽  
Size Perception ◽  
Control Group ◽  
Schizophrenia Group ◽  
Depression Group ◽  
Visual Size

The objective of this research was to measure possible changes in visual size perception of patients with depression and schizophrenia. Three groups were compared: Control Group (CG), Schizophrenia Group (SchG) and Depression Group (DepG). The diameter of the first figure seen by the participants in each painting was recorded in degrees of visual angle. The SchG perceived images 1.47 larger than CG and the DepG 1.28 larger than CG, whereas SchG selected images 1.15 larger than DepG, F (2, 57) = 17.677, p < .0001. These findings suggest there are changes in visual size perception related to depression and schizophrenia.

scholarly journals The Role of Vision in Auditory Distance Perception

Perception ◽  
10.1068/p7153 ◽  
2012 ◽  
Vol 41 (2) ◽  
pp. 175-192 ◽  
Author(s):  
Esteban R Calcagno ◽  
Ezequiel L Abregú ◽  
Manuel C Eguía ◽  
Ramiro Vergara
Keyword(s):  
Sound Source ◽  
Visual Information ◽  
Auditory Perception ◽  
Horizontal Plane ◽  
Visual Cues ◽  
Distance Perception ◽  
Apparent Distance ◽  
Multisensory Interaction ◽  
Auditory Distance

In humans, multisensory interaction is an important strategy for improving the detection of stimuli of different nature and reducing the variability of response. It is known that the presence of visual information affects the auditory perception in the horizontal plane (azimuth), but there are few researches that study the influence of vision in the auditory distance perception. In general, the data obtained from these studies are contradictory and do not completely define the way in which visual cues affect the apparent distance of a sound source. Here psychophysical experiments on auditory distance perception in humans are performed, including and excluding visual cues. The results show that the apparent distance from the source is affected by the presence of visual information and that subjects can store in their memory a representation of the environment that later improves the perception of distance.

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