Retinal origin of direction selectivity in the superior colliculus

Area of Science:

• Neuroscience
• Visual Processing
• Sensory Systems

Background:

• Detecting environmental motion direction is vital for survival.
• The neural circuits underlying direction selectivity in the superior colliculus (SC) remain largely uncharacterized.

Purpose of the Study:

• To investigate the origin of direction selectivity in the superior colliculus (SC).
• To determine the contribution of retinal inputs versus intracollicular circuits to SC direction selectivity.

Main Methods:

• Optogenetic isolation of retinal inputs to individual SC neurons.
• Two-photon calcium imaging in transgenic mice.
• Analysis of neural responses to visual stimuli.

Main Results:

• Direction selectivity in the SC is established by the convergence of already-selective retinal ganglion cells.
• Intracollicular circuits amplify, but do not create, direction selectivity.
• Reduced retinal selectivity significantly impairs SC direction selectivity.

Conclusions:

• Direction selectivity in the SC is primarily of retinal origin.
• Altered retinal feature selectivity leads to deficits in central visual processing within the SC.