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Functional relationship between somatosensory cortex and specialized afferent pathways in the monkey.
Experimental Neurology
|February 1, 1983
Summary
The primate dorsal funiculus (DF) and extra-DF pathways process distinct tactile information. Area 3b receives both, while area 2 specifically processes DF information crucial for movement-based discrimination.
Area of Science:
- Neuroscience
- Somatosensory System
- Tactile Perception
Background:
- Primate dorsal funiculus (DF) is vital for tactile discrimination involving movement.
- Extra-DF spinal afferent fibers are sufficient for tactile discrimination without movement.
Purpose of the Study:
- Investigate the association between cortical regions and the specialized tactile roles of DF and extra-DF afferent systems.
- Define the cortical distribution and processing of DF and extra-DF information.
Main Methods:
- Monkeys performed two tasks: one DF-dependent, one mediated by extra-DF pathways.
- Cortical lesions were made in various areas (3b, 1, 5, 7, 2) to assess task performance.
- Impact of lesions on DF and extra-DF mediated tasks determined information processing pathways.
Main Results:
- Lesions in area 3b impaired both tasks, with greater impact on DF tests.
- Lesions in areas 1, 5, or 7 had no effect on either task.
- Ablation of area 2's forelimb region selectively impaired DF discriminations.
Conclusions:
- Both DF and extra-DF tactile information converge in area 3b.
- Extra-DF information projects diffusely to widespread cortical regions, allowing for resilience to limited ablations.
- DF information is transmitted compactly to a focal region within area 2.