The periphery effect in cat retinal ganglion cells: variation with functional class and eccentricity

Area of Science:

• Neuroscience
• Retinal Physiology
• Visual System Circuitry

Background:

• The periphery effect (PE) describes retinal ganglion cell responses to stimuli outside their receptive field center.
• Understanding PE variations across cell types and retinal locations is crucial for mapping visual processing pathways.

Purpose of the Study:

• To investigate the periphery effect (PE) in different classes of cat retinal ganglion cells (Y, X, and W).
• To determine how the strength of the PE varies with retinal eccentricity and cell class.

Main Methods:

• Ganglion cell classes (Y, X, W) were identified using response latency to optic chiasm stimulation and receptive field properties.
• The strength of the PE was measured using rotating windmill and counterphased grating stimuli.
• PE strength was analyzed in relation to retinal eccentricity and cell type.

Main Results:

• The PE was consistently stronger in Y-cells compared to X-cells.
• For both X- and Y-cells, PE strength significantly increased with retinal eccentricity.
• Approximately 47% of W-cells exhibited a PE, with 36% showing excitatory and 11% inhibitory responses; PE in W-cells also increased with eccentricity.

Conclusions:

• The periphery effect's strength varies significantly across Y, X, and W retinal ganglion cell classes.
• Retinal eccentricity is a key factor influencing the strength of the PE in all studied cell types.
• Observed variations in PE suggest complex circuitry within the inner plexiform layer of the retina.