are neurons in the brain's visual system that respond to particular features of a stimulus.

The cells of the visual cortex are neurons in the brain's visual system that respond to particular features of a stimulus.

Explanation:

These neurons respond to stimuli presented to both eyes. Simple cells receive innervation directly from thalamic cells and respond to light stimuli with defined orientation and with specific configuration and location in the visual field. Complex cells also respond to the orientation parameter.  

These cells trigger action potentials when the visual stimulus appears within their receptive field.

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