Complex-unoriented cells in a subregion of primate area 18
Nature
|May 23, 1985
Summary
Researchers found that the secondary visual cortex (area 18) in primates, like the primary visual cortex (area 17), has functional subdivisions related to color and form processing. This supports the idea of parallel pathways for visual information.
Area of Science:
- Neuroscience
- Primate Visual System
Background:
- Primary visual cortex (area 17) in primates shows histological subdivisions based on cytochrome oxidase staining.
- These subdivisions in area 17 correlate with functional specializations for color (cytochrome-dark) and form (cytochrome-light) processing.
Purpose of the Study:
- To investigate if the secondary visual area (area 18) in primates also exhibits functional subdivisions corresponding to cytochrome oxidase staining patterns.
- To determine if the segregation of form and color information is maintained in area 18.
Main Methods:
- Histological staining for the mitochondrial enzyme cytochrome oxidase in primate visual cortical areas.
- Correlation of histological patterns with functional visual processing (color vs. form).
Main Results:
- Area 18, receiving input from area 17, demonstrates functional subdivisions that align with cytochrome oxidase staining.
- The segregation of form and color information processing is preserved in area 18.
Conclusions:
- Functional subdivisions based on cytochrome oxidase staining exist in both primary (area 17) and secondary (area 18) visual cortices of primates.
- Form and color information appear to travel through parallel pathways in the primate visual system.
- Differences between cells in areas 17 and 18 suggest spatial generalization as a step in hierarchical visual information processing.
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