PT  - JOURNAL ARTICLE
AU  - Ashley L. Russell
AU  - Karen G. Dixon
AU  - Jason W. Triplett
TI  - Diverse modes of binocular interactions in the mouse superior colliculus
AID  - 10.1101/2020.12.14.422574
DP  - 2021 Jan 01
TA  - bioRxiv
PG  - 2020.12.14.422574
4099  - http://biorxiv.org/content/early/2021/12/03/2020.12.14.422574.short
4100  - http://biorxiv.org/content/early/2021/12/03/2020.12.14.422574.full
AB  - The superior colliculus (SC) integrates visual and other sensory information to regulate critical reflexive and innate behaviors, such as prey capture. In the mouse, the vast majority of retinal ganglion cells (RGCs) innervate the SC, including inputs from both the contralateral (contra-RGCs) and ipsilateral (ipsi-RGCs) eye. Despite this, previous studies revealed minimal neuronal responses to ipsilateral stimulation and few binocular interactions in the mouse SC. More recent work suggests that ipsi-RGC function and innervation of the SC are critical for efficient prey capture, raising the possibility that binocular interactions in the mouse SC may be more prevalent than previously thought. To explore this possibility, we investigated eye-specific and binocular influences on visual responses and tuning of SC neurons, focusing on the anteromedial region. While the majority of SC neurons were primarily driven by contralateral eye stimulation, we observed that a substantial proportion of units were influenced or driven by ipsilateral stimulation. Clustering based on differential responses to eye-specific stimulus presentation revealed five distinct putative subpopulations and multiple modes of binocular interaction, including facilitation, summation, and suppression. Each of the putative subpopulations exhibited selectivity for orientation, and differences in spatial frequency tuning and spatial summation properties were observed between subpopulations. Further analysis of orientation tuning under different ocular conditions supported differential modes of binocular interaction between putative subtypes. Taken together, these data suggest that binocular interactions in the mouse SC may be more prevalent and diverse than previously understood.Competing Interest StatementThe authors have declared no competing interest.