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Author Spotlight: Insights into Visual Cortex Research Through Wide-View fMRI Mapping
Published on: December 8, 2023
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Effects of healthy aging on human primary visual cortex
Alyssa A Brewer1, Brian Barton1
1Department of Cognitive Sciences, University of California, Irvine, USA.
Health
|February 17, 2016
Summary
Aging impacts the primary visual cortex (V1), causing reduced V1 surface area and decreased fMRI signal coherence. Population receptive field sizes increase in older adults, affecting visual processing.
Area of Science:
- Neuroscience
- Vision Science
- Aging Research
Background:
- Aging commonly leads to decreased visual acuity due to ocular and neural changes.
- Primary visual cortex (V1) shows reduced responses to visual stimuli in normally aging individuals.
- The impact of aging on V1 visual field representations and population receptive field sizes remains unclear.
Purpose of the Study:
- To investigate age-related changes in retinotopic representations and population receptive fields in human V1.
- To compare V1 structure and function between healthy young and aging adults using advanced neuroimaging techniques.
Main Methods:
- Employed functional magnetic resonance imaging (fMRI) and population receptive field (pRF) modeling.
- Measured angular and eccentric retinotopic representations in V1 of young (24-36 years) and aging (57-70 years) adults.
- Utilized drifting checkerboard stimuli to map visual field representations.
Main Results:
- Aging subjects exhibited a significant decrease in V1 surface area within 0-3 degrees eccentricity (p=0.039).
- fMRI BOLD signal coherence was significantly reduced in aging subjects in the peripheral eccentricity band (7-10 degrees) (p=0.029).
- Population receptive field sizes were significantly larger in the foveal representation (0-3 degrees) of V1 in aging subjects (p=0.019).
Conclusions:
- Normal aging alters primary visual cortex organization, including reduced V1 area and impaired signal coherence.
- Increased pRF sizes in aging V1 suggest compensatory mechanisms or altered neural processing.
- Findings are crucial for understanding normal aging and for clinical comparisons in age-related visual disorders.
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