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Estimating receptive field size from fMRI data in human striate and extrastriate visual cortex
A T Smith1, K D Singh, A L Williams
1Department of Psychology, Royal Holloway, University of London, Egham TW20 0EX, UK. a.t.smith@rhul.ac.uk
Cerebral Cortex (New York, N.Y. : 1991)
|November 16, 2001
Summary
Functional magnetic resonance imaging (fMRI) revealed that neuronal receptive field sizes increase across human visual areas, from V1 to V4. This progression, consistent across eccentricities, aligns with findings in macaque monkeys.
Area of Science:
- Neuroscience
- Human visual cortex research
Background:
- Understanding neuronal receptive field sizes is crucial for mapping visual processing.
- Previous studies in non-human primates provide a basis for comparison.
Purpose of the Study:
- To estimate average receptive field sizes in human striate and extrastriate visual areas.
- To investigate how receptive field size varies across different visual areas and stimulus eccentricity.
Main Methods:
- Functional magnetic resonance imaging (fMRI) was employed to measure neuronal activity.
- Retinotopic mapping procedures were used to delineate visual area boundaries.
- Receptive field size estimates were derived from the temporal dynamics of fMRI activation patterns.
Main Results:
- Receptive fields are smallest in the primary visual cortex (V1).
- Receptive field size progressively increases in areas V2, V3/VP, V3A, and V4.
- In all studied areas, receptive field size increases with stimulus eccentricity.
Conclusions:
- The human visual system exhibits a systematic increase in receptive field size from early to later visual areas.
- These findings in humans are consistent with neurophysiological data from macaque monkeys.
- The study provides valuable insights into the organization of the human visual cortex.