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Updated: Aug 12, 2026
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Targeted Labeling of Neurons in a Specific Functional Micro-domain of the Neocortex by Combining Intrinsic Signal and Two-photon Imaging
Published on: December 12, 2012
Specificity of intrinsic connections in primate primary visual cortex
Summary
Intrinsic lateral connections in macaque monkey visual cortex (area 17) show a clear preference for cytochrome oxidase blobs or nonblob regions. This segregation suggests functional compartmentalization within the visual processing system.
Area of Science:
- Neuroscience
- Visual Cortex Research
- Primate Brain Studies
Background:
- Recent studies suggest patchy intrinsic lateral connections in macaque area 17.
- The relationship between these connections and cytochrome oxidase blobs is not well understood.
Purpose of the Study:
- To investigate the relationship between intrinsic lateral connections in area 17 and cytochrome oxidase blobs.
- To determine if connectional patterns segregate with blob and nonblob territories.
Main Methods:
- Multiple small injections of horseradish peroxidase into layers 2 and 3 of area 17 in macaque monkeys.
- Injections were targeted to be entirely within a single blob or entirely outside a blob.
- Tracing of anterograde transport to identify connected regions.
Main Results:
- Injections centered in blobs resulted in preferential labeling of nearby blobs, avoiding nonblob areas.
- Injections centered in nonblob areas predominantly labeled surrounding nonblob regions, avoiding blobs.
- Similar blob/nonblob segregation was observed in layer 5, while layers 4 and 6 showed restricted labeling.
Conclusions:
- Intrinsic lateral connections in macaque area 17 exhibit a strong preference for either blob or nonblob territories.
- This segregation indicates functionally distinct pathways within the cytochrome oxidase blobs and interblob regions.
- Findings support a compartmentalized organization of visual processing in the primate cortex.
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