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[Neurons in monkey parietal association cortex sensitive to axis orientation]

H Ohtsuka¹, Y Tanaka, M Kusunoki

¹Department of Ophthalmology, Nihon University School of Medicine, Tokyo, Japan.

Nippon Ganka Gakkai Zasshi

|January 1, 1995

Summary

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Neurons in the parietal cortex discriminate object orientation. This study found specific neurons in the posterior parietal association cortex (PPC) that are selective for the axis orientation of visual stimuli in 3D space.

Area of Science:

Neuroscience
Visual Perception
Computational Neuroscience

Context:

Parietal cortex lesions impair hand-object orientation adjustment and orientation judgment.
This suggests a critical role for the parietal cortex in object orientation discrimination.

Purpose:

To investigate the orientation selectivity of visual neurons in the posterior parietal association cortex (PPC) of alert, behaving monkeys.
To understand how the brain represents object orientation in three-dimensional space.

Summary:

Recorded 23 orientation-selective neurons in the caudal intraparietal sulcus (IPS) of monkeys.
Neurons responded selectively to the axis orientation of visual stimuli, including 2D slits and 3D objects.
Many neurons exhibited position-invariant, wide receptive fields, responding to longitudinal axis orientation in 3D space.

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Impact:

Provides evidence for axis orientation selective neurons in the parietal cortex.
Suggests these neurons are crucial for representing object orientation in 3D space.
Informs our understanding of spatial cognition and sensorimotor integration deficits associated with parietal lesions.