Receptive fields of single cells and topography in mouse visual cortex

Area of Science:

• Neuroscience
• Visual System Research
• Mammalian Visual Cortex

Background:

• The visual cortex processes visual information, with its organization varying across species.
• Understanding the mouse visual cortex provides insights into mammalian visual processing.

Purpose of the Study:

• To construct a topographic map of the mouse visual cortex (area 17).
• To characterize neuronal responses to visual stimuli, including orientation selectivity and receptive field types.
• To investigate the representation of the binocular visual field and interhemispheric projections.

Main Methods:

• Single-unit recordings in the visual cortex of C57 Black/6J mice.
• Stimulation with oriented line stimuli and measurement of neuronal responses.
• Construction of topographic maps based on receptive field properties.

Main Results:

• 45% of striate cortex neurons responded to oriented moving stimuli (simple, complex, hypercomplex).
• Horizontal orientation was the most preferred; 55% of receptive fields were circularly symmetric.
• Higher optimal stimulus velocities were observed compared to cats.
• Over one-third of striate cortex represents the binocular visual field, with significant ipsilateral eye input.
• Topographic mapping revealed similarities to other mammals, with unique ipsilateral hemifield representation.

Conclusions:

• The mouse visual cortex exhibits a detailed topographic organization and diverse neuronal response properties.
• The study provides a comprehensive map of the mouse visual cortex, including area 17 and adjacent areas (18a, 18).
• Findings contribute to understanding mammalian visual system evolution and function.