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Updated: Aug 11, 2026

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Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings
Published on: August 1, 2018
Specificity of visual and motor cortex neurons activity in behavior
Acta Neurobiologiae Experimentalis
|January 1, 1982
Summary
Visual and motor cortex neurons activate during behavior, but visual input isn't essential. Sensory feedback, both visual and motor, influences neuronal activity patterns in these brain regions.
Area of Science:
- Neuroscience
- Behavioral Neuroscience
Background:
- The interplay between sensory input and motor output is crucial for adaptive behavior.
- Understanding the roles of the visual cortex (VC) and motor cortex (MC) in processing environmental and executive behavioral cues is essential.
Purpose of the Study:
- To investigate the necessity of visual inflow for neuronal activation in the VC and MC.
- To examine how sensory feedback (visual and motor) modulates neuronal activity patterns in the VC and MC during a behavioral task.
Main Methods:
- Recording unit activity in the visual cortex (VC) and motor cortex (MC) of rabbits.
- Monitoring head and lower jaw movements, and electromyography (EMG) of the masseter muscle.
- Manipulating visual input by using occluders and altering motor feedback by impeding head movement.
Main Results:
- Neuronal activation in both MC and VC occurred even without visual input, indicating visual inflow is not strictly necessary.
- Closing the eyes altered neuronal activity patterns, with more pronounced changes observed in the VC.
- VC neurons exhibited greater susceptibility to activity changes following both visual and motor sensory influences compared to MC neurons.
Conclusions:
- The visual cortex and motor cortex are involved in behavioral mechanisms, influenced by both environmental and executive factors.
- Neuronal activity in the VC and MC can be modulated by sensory feedback, with the VC showing higher sensitivity to these modulations.
Related Concept Videos
Vision
Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.
Somatosensation
The somatosensory system relays sensory information from the skin, mucous membranes, limbs, and joints. Somatosensation is more familiarly known as the sense of touch. A typical somatosensory pathway includes three types of long neurons: primary, secondary, and tertiary. Primary neurons have cell bodies located near the spinal cord in groups of neurons called dorsal root ganglia. The sensory neurons of ganglia innervate designated areas of skin called dermatomes.
Motor and Sensory Areas of the Cortex
The cerebral cortex, the brain's outermost layer, is pivotal in processing complex cognitive tasks, emotions, and various sensory inputs and executing voluntary motor activities. This intricate structure is divided into three primary functional areas: the motor areas, sensory areas, and association areas.
Motor Areas
The motor areas located in the frontal lobe are central to controlling voluntary movements. This region is further subdivided into the primary motor cortex and the premotor cortex.
Motor Areas
The motor areas located in the frontal lobe are central to controlling voluntary movements. This region is further subdivided into the primary motor cortex and the premotor cortex.
Association Areas of the Cortex
Association areas are regions of the cerebral cortex that do not have a specific sensory or motor function. Instead, they integrate and interpret information from various sources to enable higher cognitive processes such as memory, learning, and decision-making. Some key association areas include the following:
Prefrontal Association Area: This area is located in the frontal lobe and is involved in planning, decision-making, and moderating social behavior. It connects with primary motor areas,...
Prefrontal Association Area: This area is located in the frontal lobe and is involved in planning, decision-making, and moderating social behavior. It connects with primary motor areas,...
Somatosensory, Motor, and Association Cortex
The somatosensory cortex in the parietal lobes is crucial for interpreting sensory data such as touch, temperature, and proprioception. The somatosensory cortex, situated in the parietal lobes, plays a vital role in interpreting sensory information like touch, temperature, and proprioception—awareness of body position. This specialized brain region features an organized structure wherein neurons at the top primarily process sensations originating from the lower body. In contrast, those at the...

