scholarly journals Influence of peripheral vision on object categorization in central vision

2019 ◽  
Vol 19 (14) ◽  
pp. 7 ◽  
Author(s):  
Alexia Roux-Sibilon ◽  
Audrey Trouilloud ◽  
Louise Kauffmann ◽  
Nathalie Guyader ◽  
Martial Mermillod ◽  
...  
Keyword(s):  
Peripheral Vision ◽  
Object Categorization ◽  
Central Vision

scholarly journals Influence of peripheral vision on object categorization in central vision

2019 ◽  
Author(s):  
Alexia Roux-Sibilon ◽  
Audrey Trouilloud ◽  
Louise Kauffmann ◽  
Nathalie Guyader ◽  
Martial Mermillod ◽  
...  
Keyword(s):  
Predictive Models ◽  
Visual Recognition ◽  
Peripheral Vision ◽  
Object Categorization ◽  
Congruence Effect ◽  
Central Vision ◽  
Visual Processes ◽  
Spatial Frequencies ◽  
Level Information ◽  
Rapid Processing

Predictive models of visual recognition state that predictions based on the rapid processing of low spatial frequencies (LSF) may guide the subsequent processing of high spatial frequencies (HSF). While the HSF signal necessarily comes from central vision, most of the LSF signal comes from peripheral vision. The present study aimed at understanding how LSF in peripheral vision may be used to generate predictive signals that guide visual processes in central vision. In two experiments, participants performed an object categorization task in central vision while a semantically congruent or incongruent scene background was displayed in peripheral vision. In Experiment 1, results showed a congruence effect when the peripheral scene was displayed before the object onset. In Experiment 2, results showed a congruence effect only when the peripheral scene was intact, thus carrying a semantic meaning, but not when it was phase-scrambled, thus carrying only low-level information. The study suggests that the low resolution of peripheral vision facilitates the processing of foveated objects in the visual scene, in line with predictive models of visual recognition.

Second-Order Reversed Phi

2017 ◽  
Author(s):  
Zhong-Lin Lu ◽  
George Sperling
Keyword(s):  
Peripheral Vision ◽  
Forward Direction ◽  
Second Order ◽  
Central Vision ◽  
Third Order ◽  
Texture Contrast ◽  
Direction Opposite ◽  
Reversed Motion

A second-order reversed-phi stimulus is composed of moving features (areas filled with texture) whose overall amount of texture-contrast is reversed between successive frames. In peripheral vision, the stimulus is perceived as moving in the reversed direction (opposite to the feature displacement). In central vision, it is perceived in the forward direction at low temporal frequencies but in the reversed direction at high temporal frequencies. Moving the observer away from the displays has the same effect as changing from central to periphery vision: reversed motion becomes more dominant. The illusion demonstrates the different properties of the second- and third-order motion systems.

scholarly journals Comparison of giale sensatiofrom the light source in the central vision and the peripheral vision.(Part 2)

1989 ◽  
Vol 73 (Appendix) ◽  
pp. 83-83
Author(s):  
Masanobu Nishimura ◽  
Hanji Satone ◽  
Toru Tutui ◽  
Hajimu Nakamura ◽  
Yoshihiko Tabuchi
Keyword(s):  
Light Source ◽  
Peripheral Vision ◽  
Central Vision

scholarly journals Are Visual Peripheries Forever Young?

2015 ◽  
Vol 2015 ◽  
pp. 1-13 ◽  
Author(s):  
Kalina Burnat
Keyword(s):  
Visual Processing ◽  
Visual Experience ◽  
Peripheral Vision ◽  
Postnatal Life ◽  
Central Vision ◽  
Central Processing ◽  
Afferent Projections ◽  
Vision Processing ◽  
Experimental Findings ◽  
Normal Perception

The paper presents a concept of lifelong plasticity of peripheral vision. Central vision processing is accepted as critical and irreplaceable for normal perception in humans. While peripheral processing chiefly carries information about motion stimuli features and redirects foveal attention to new objects, it can also take over functions typical for central vision. Here I review the data showing the plasticity of peripheral vision found in functional, developmental, and comparative studies. Even though it is well established that afferent projections from central and peripheral retinal regions are not established simultaneously during early postnatal life, central vision is commonly used as a general model of development of the visual system. Based on clinical studies and visually deprived animal models, I describe how central and peripheral visual field representations separately rely on early visual experience. Peripheral visual processing (motion) is more affected by binocular visual deprivation than central visual processing (spatial resolution). In addition, our own experimental findings show the possible recruitment of coarse peripheral vision for fine spatial analysis. Accordingly, I hypothesize that the balance between central and peripheral visual processing, established in the course of development, is susceptible to plastic adaptations during the entire life span, with peripheral vision capable of taking over central processing.

scholarly journals Reliance on central vs. peripheral vision for visual search in younger and older adults

2020 ◽  
Author(s):  
Anne-Sophie Laurin ◽  
Julie Ouerfelli-Éthier ◽  
Laure Pisella ◽  
Aarlenne Zein Khan
Keyword(s):  
Older Adults ◽  
Visual Search ◽  
Peripheral Vision ◽  
Reaction Times ◽  
Central Vision ◽  
Younger Adults ◽  
Serial Search ◽  
Attentional Resources ◽  
Search Tasks ◽  
Fixation Durations

Older adults show declines performing visual search, but their nature is unclear. We propose that it is related to greater attentional reliance on central vision. To investigate this, we tested how occluding central vision would affect younger and older adults in visual search. Participants (14 younger, M = 21.6 years; 16 older, M = 69.6 years) performed pop-out and serial search tasks in full view and with different sized gaze-contingent artificial central scotomas (no scotoma, 3°, 5° or 7° diameter).In pop-out search, older adults showed longer search times for peripheral targets during full viewing. Their reaction times, saccades and fixation durations also increased as a function of scotoma size, contrary to younger adults. These declines may reflect a relative impairment in peripheral visual attention for global processing in aging.In serial search, despite older adults being generally slower, we found no difference between groups in reaction time increases for eccentric targets and for bigger scotomas. These results may come from the difficulty of serial search, in which both groups used centrally limited attentional windows.We conclude that older adults allocate more attentional resources towards central vision compared to younger adults, impairing their peripheral processing primarily in pop-out visual search.

Reduced Contrast Sensitivity Function in Central and Peripheral Vision by Disability Glare

Perception ◽  
2020 ◽  
Vol 49 (12) ◽  
pp. 1348-1361
Author(s):  
Di Wu ◽  
Na Liu ◽  
Pengbo Xu ◽  
Kewei Sun ◽  
Wei Xiao ◽  
...  
Keyword(s):  
Contrast Sensitivity ◽  
Traffic Accidents ◽  
Peripheral Vision ◽  
Visual Fields ◽  
Real Life ◽  
Sensitivity Function ◽  
Visual Performance ◽  
Contrast Sensitivity Function ◽  
Central Vision ◽  
Disability Glare

Various glares can decrease visual performance and cause discomfort, thus increasing drivers’ risk for traffic accidents in real life. The current study aimed to systematically investigate glare sensitivity in the central and peripheral visual fields by measuring contrast sensitivity function (CSF) under nonglare, steady glare, and transient glare conditions. Nine observers with normal visual acuity in the dominant eye were enrolled. The CSF in central and peripheral vision (the 5° upper left visual field) was measured in a mesopic environment while the stimulus was displayed under three conditions: nonglare, steady glare, and transient glare. An orientation identification task was used to obtain the CSF. After the experiment, the observers were asked to report their level of discomfort in the presence of the glare. The area under the log CSF (AULCSF) and cut-off spatial frequency served as indicators of visual performance. In agreement with previous studies, both steady and transient glare reduced the AULCSF and cut-off frequency. However, the AULCSF and cut-off frequency were reduced more for central vision than for nearly peripheral vision. In addition, the extent of the decreases in the AULCSF and cut-off frequency was greater for steady glare than for transient glare; in contrast, more discomfort was associated with transient glare than steady glare.

Implantation of the First IMT Macular Lens in Age-Related Macular Degeneration (Literature Review)

2019 ◽  
Vol 4 (4) ◽  
pp. 56-60
Author(s):  
M. M. Bikbov ◽  
O. I. Orenburkina ◽  
A. E. Babushkin
Keyword(s):  
Visual Field ◽  
Macular Degeneration ◽  
Peripheral Vision ◽  
Age Related Macular Degeneration ◽  
Central Vision ◽  
Central Visual Field ◽  
Visual Rehabilitation ◽  
Age Related ◽  
Terminal Form ◽  
Special Programs

This review presents the characteristics and results of clinical studies of patients with age-related macular degeneration implanted with the developed for this purpose first macular IOL – intraocular macular telescope (IMT). This lens was designed specifically for patients with the most severe or terminal form of age-related macular degeneration and is designed for monocular implantation to provide central vision while maintaining peripheral vision of the paired eye, which is important for maintaining the balance and orientation of patients. This device allows patients to see both in dynamic and static situations in the near, intermediate and far ranges. The disadvantages of this lens are a decrease in the visual field and depth of focus (which excludes its bilateral implantation), the need for a large (10–12 mm) incision for implantation, which can cause an increase in corneal astigmatism and the risk of complications, in particular, the pupillary block with an increase in intraocular pressure. There are also difficulties in the study of the fundus after its implantation to assess the small changes in the macula or to identify possible postoperative complications after cataract surgery (macular oedema, etc.). Also after the implantation of this lens, there is need for special programs of visual rehabilitation. The patient’s commitment to the rehabilitation measures for the adaptation of the central visual field of the operated eye with the peripheral vision of the second eye is crucial for success of the IMT macular telescope implantation procedure.

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