Bidirectional encoding of motion contrast in the mouse superior colliculus

Male 0301 basic medicine vision Superior Colliculi QH301-705.5 Science Motion Perception Gene Expression superior colliculus Mice Motion 03 medical and health sciences Genes, Reporter Orientation direction selectivity Animals Biology (General) GABAergic Neurons center-surround interactions Visual Cortex saliency Glutamate Decarboxylase Q R Molecular Imaging Mice, Inbred C57BL Luminescent Proteins Medicine Female Visual Fields two-photon imaging Photic Stimulation Neuroscience Red Fluorescent Protein
DOI: 10.7554/elife.35261 Publication Date: 2018-07-02T12:08:29Z
ABSTRACT
Detection of salient objects in the visual scene is a vital aspect of an animal’s interactions with its environment. Here, we show that neurons in the mouse superior colliculus (SC) encode visual saliency by detecting motion contrast between stimulus center and surround. Excitatory neurons in the most superficial lamina of the SC are contextually modulated, monotonically increasing their response from suppression by the same-direction surround to maximal potentiation by an oppositely-moving surround. The degree of this potentiation declines with depth in the SC. Inhibitory neurons are suppressed by any surround at all depths. These response modulations in both neuronal populations are much more prominent to direction contrast than to phase, temporal frequency, or static orientation contrast, suggesting feature-specific saliency encoding in the mouse SC. Together, our findings provide evidence supporting locally generated feature representations in the SC, and lay the foundations towards a mechanistic and evolutionary understanding of their emergence.
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