scholarly journals Dividing attention between two simultaneous visual tasks I: The Parvocellular system & the Koniocellular system

2010 ◽  
Vol 9 (8) ◽  
pp. 210-210
Author(s):  
S. Maeda ◽  
A. Nagy ◽  
S. Watamaniuk
Keyword(s):  
Parvocellular System ◽  
Visual Tasks

scholarly journals ASYMMETRY IN REGARD TO THE EFFECTS OF MAGNOCELLULAR AND PARVOCELLULAR LESIONS

2021 ◽  
Author(s):  
Bernt Skottun
Keyword(s):  
Lateral Geniculate Nucleus ◽  
Cell Number ◽  
Visual Task ◽  
The Other ◽  
Visual Stream ◽  
Magnocellular System ◽  
Lateral Geniculate ◽  
Parvocellular System ◽  
Visual Tasks ◽  
Number Of Cells

The placing of lesions in the magno- and parvocellular layers of the Lateral Geniculate Nucleus (LGN) of the visual stream has been used in attempts to assess the contributions of the two systems to various visual tasks. However, because there are about ten times as many parvocellular cells as magnocellular cells a lesion blocking the parvocellular input would be expected to have a larger deleterious impact than one blocking the magnocellular input. Thus, a visual task that depends upon all inputs, i.e. which is not linked specifically to either the magno- or parvocellular systems, would be expected to be more severely affected by a lesion in the parvocellular system than by one in the magnocellular system simply on the basis of the number of cells involved. A larger impact of a parvocellular lesion can, therefore, not be taken to mean that the task in question is specifically, or predominantly, linked to this system. Effects following magnocellular lesions (and not observed following parvocellular lesions), on the other hand, cannot be accounted for on the basis of cell number. There is, therefore, an asymmetry, in regard to the significance of the effects of lesions placed in the magno- and parvocellular layers of the LGN.

Differential Use of Verbal Coding by Young and Older Adults in Static and Dynamic Visual Tasks

2013 ◽  
Author(s):  
Mark J. Horne ◽  
Ian Deary ◽  
Louise Brown ◽  
Robert H. Logie
Keyword(s):  
Older Adults ◽  
Visual Tasks

scholarly journals Lighting for pedestrians: Does multi-tasking affect the performance of typical pedestrian tasks?

2021 ◽  
pp. 147715352110026
Author(s):  
Y Mao ◽  
S Fotios
Keyword(s):  
Emotion Recognition ◽  
Recognition Task ◽  
Obstacle Detection ◽  
Detection Task ◽  
Facial Emotion Recognition ◽  
Facial Emotion ◽  
Impaired Performance ◽  
Lighting Conditions ◽  
Multiple Tasks ◽  
Visual Tasks

Obstacle detection and facial emotion recognition are two critical visual tasks for pedestrians. In previous studies, the effect of changes in lighting was tested for these as individual tasks, where the task to be performed next in a sequence was known. In natural situations, a pedestrian is required to attend to multiple tasks, perhaps simultaneously, or at least does not know which of several possible tasks would next require their attention. This multi-tasking might impair performance on any one task and affect evaluation of optimal lighting conditions. In two experiments, obstacle detection and facial emotion recognition tasks were performed in parallel under different illuminances. Comparison of these results with previous studies, where these same tasks were performed individually, suggests that multi-tasking impaired performance on the peripheral detection task but not the on-axis facial emotion recognition task.

Visual tasks and postural sway in children with and without autism spectrum disorders

2010 ◽  
Vol 31 (6) ◽  
pp. 1536-1542 ◽  
Author(s):  
Chih-Hui Chang ◽  
Michael G. Wade ◽  
Thomas A. Stoffregen ◽  
Chin-Yu Hsu ◽  
Chien-Yu Pan
Keyword(s):  
Autism Spectrum Disorders ◽  
Postural Sway ◽  
Autism Spectrum ◽  
Visual Tasks ◽  
Spectrum Disorders

The Relation between Angle of Display and Performance in a Prolonged Visual Task

1950 ◽  
Vol 2 (4) ◽  
pp. 176-181 ◽  
Author(s):  
D. C. Fraser
Keyword(s):  
Present Experiment ◽  
Visual Task ◽  
The Other ◽  
Vertical Position ◽  
Display Surface ◽  
Visual Tasks ◽  
And Performance

An experiment is described to test the relation between angle of display and performance in prolonged visual tasks, using the Clock Test in three positions of display surface, vertical, at an angle of 45 degrees to the horizontal, and horizontal. In every case the line of regard was kept at right-angles to the display surface. The results indicate that significantly fewer stimuli are missed in the vertical position of the display surface than in the other two. The deterioration observed in the second half-hour of the original Clock Test experiments was not found in the present experiment, and two possible reasons for this are discussed briefly.

Development of Efficiency in Visual Functioning: Rationale for a Comprehensive Program

1979 ◽  
Vol 73 (4) ◽  
pp. 121-126 ◽  
Author(s):  
Natalie C. Barraga ◽  
Marcia E. Collins
Keyword(s):  
Visual System ◽  
Visual Functioning ◽  
Comprehensive Program ◽  
Outdoor Environments ◽  
Visual Tasks ◽  
Indoor And Outdoor Environments ◽  
Indoor And Outdoor

The rationale for a comprehensive program in visual functioning is based upon an assumed interaction between: (a) functions performed by the visual system, (b) developmental visual tasks organized in keeping with perceptual/cognitive milestones, and (c) a variety of indoor and outdoor environments.

scholarly journals Attention during active visual tasks: Counting, pointing, or simply looking

2009 ◽  
Vol 49 (9) ◽  
pp. 1017-1031 ◽  
Author(s):  
John D. Wilder ◽  
Eileen Kowler ◽  
Brian S. Schnitzer ◽  
Timothy M. Gersch ◽  
Barbara A. Dosher
Keyword(s):  
Visual Tasks
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