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The Optical Fractionator Technique to Estimate Cell Numbers in a Rat Model of Electroconvulsive Therapy

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The effect of viewing eccentricity on enumeration.

Melanie Palomares¹, Paul R Smith, Carole Holley Pitts

¹Department of Psychology, University of South Carolina, Columbia, South Carolina, United States of America. paloma@sc.edu

|June 23, 2011

Summary

Visual enumeration accuracy decreases with viewing distance, but scaling stimulus size with cortical magnification preserves this ability. Subitizing, the precise counting of few items, remains unaffected by eccentricity.

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Area of Science:

Visual perception
Cognitive neuroscience
Psychophysics

Background:

Visual acuity and contrast sensitivity decline with increasing viewing eccentricity.
Understanding how visual enumeration is affected by eccentricity is crucial for visual neuroscience.

Purpose of the Study:

To evaluate the impact of visual eccentricity on visual enumeration.
To determine if subitizing capacity decreases with eccentric viewing.
To investigate the role of cortical magnification in mitigating eccentricity effects on enumeration.

Main Methods:

Participants enumerated visual gratings under two conditions: constant stimulus size and size scaled by cortical magnification.
Enumeration accuracy, precision, and subitizing capacity were measured across different viewing eccentricities.

Main Results:

Enumeration accuracy and precision decreased with increasing eccentricity, but cortical magnification scaling normalized these effects.
Subitizing capacities remained constant across all eccentricities, unaffected by size scaling.
Size scaling modulated variation coefficients, indicating its influence on enumeration precision at larger eccentricities.

Conclusions:

The decline in enumeration accuracy and precision with eccentricity is attributed to spatial resolution limitations.
The precise number system (subitizing) is limited to small numerosities, while the approximate number system extends across larger numerosities.
Cortical magnification plays a key role in maintaining visual enumeration performance across different viewing eccentricities.