# Testing the effects of visual field on perceptual organization as a potential source of unexplained visual dysfunction in macular degeneration

> **NIH NIH R21** · UNIVERSITY OF IOWA · 2020 · $187,730

## Abstract

Project Summary
 The goal of this work is to characterize changes in visual processes that transform the 2-dimensional
retinal image into object-based 3-dimensional representations of the world as a function of location within the
visual field. These processes—referred to collectively as perceptual organization—are critical to the success
of more complex visual tasks including important everyday tasks like reading, recognizing individuals, and
following dynamic events on a screen or in the world. The underlying neurophysiology of the most
fundamental components of perceptual organization suggest the hypothesis that perceptual organization is
relatively poor for information in peripheral regions of the visual field compared to central regions. We will test
that hypothesis in this work. Part of the significance of this work is that macular degeneration, which is the
leading cause of blindness in people over the age of 65, and is expected to affect nearly 2 million individuals
in the U.S. by 2020, is characterized by progressive loss of vision in central regions of the visual field.
Individuals with macular degeneration therefore have to learn to rely on information in their periphery, and
many interventions for the disease focus on increasing the size of peripheral information to compensate for
known decreases in spatial resolution with eccentricity. Despite the success of these interventions to improve
sensitivity to peripheral stimuli, many patients continue to suffer dysfunction in more complex, and critical for
everyday life, tasks such as reading and recognizing faces. We hypothesize that an important part of this
residual dysfunction is caused by the need to rely on peripheral perceptual organization which yields relatively
poor 3D models of the world, even if edges and other low-level features are perfectly discriminable. This
project will (1) quantify a set of four basic perceptual organization processes that are directly relatable to the
simple neurophysiological mechanisms that have been identified and that provide motivation for the basic
hypothesis, (2) test the hypothesis that an important downstream process that depends on perceptual
organization – object-based attention — also decreases in effectiveness in more peripheral regions of the
visual field and (3) test the hypothesis that changes in perceptual organization as a function of location in the
visual field can predict changes in object-based attention within individual observers. If this work provides
support for the basic hypotheses being tested, then follow-up work will extend the measurements to patients
with central visual-field loss and ask whether their specific dysfunctions can be accounted for by reliance on
relatively poor perceptual organization and if so, seek to develop interventions that either improve or
compensate specifically for this dependence.

## Key facts

- **NIH application ID:** 9898382
- **Project number:** 5R21EY029432-02
- **Recipient organization:** UNIVERSITY OF IOWA
- **Principal Investigator:** CATHLEEN M MOORE
- **Activity code:** R21 (R01, R21, SBIR, etc.)
- **Funding institute:** NIH
- **Fiscal year:** 2020
- **Award amount:** $187,730
- **Award type:** 5
- **Project period:** 2019-04-01 → 2022-03-31

## Primary source

NIH RePORTER: https://reporter.nih.gov/project-details/9898382

## Citation

> US National Institutes of Health, RePORTER application 9898382, Testing the effects of visual field on perceptual organization as a potential source of unexplained visual dysfunction in macular degeneration (5R21EY029432-02). Retrieved via AI Analytics 2026-05-24 from https://api.ai-analytics.org/grant/nih/9898382. Licensed CC0.

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