Abstract：
:Animals promote their survival by avoiding rapidly approaching objects that indicate threats. In mice, looming-evoked defensive responses are triggered by the superior colliculus (SC) which receives direct retinal inputs. However, the specific neural circuits that begin in the retina and mediate this important behaviour remain unclear. Here we identify a subset of retinal ganglion cells (RGCs) that controls mouse looming-evoked defensive responses through axonal collaterals to the dorsal raphe nucleus (DRN) and SC. Looming signals transmitted by DRN-projecting RGCs activate DRN GABAergic neurons that in turn inhibit serotoninergic neurons. Moreover, activation of DRN serotoninergic neurons reduces looming-evoked defensive behaviours. Thus, a dedicated population of RGCs signals rapidly approaching visual threats and their input to the DRN controls a serotonergic self-gating mechanism that regulates innate defensive responses. Our study provides new insights into how the DRN and SC work in concert to extract and translate visual threats into defensive behavioural responses.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Huang L,Yuan T,Tan M,Xi Y,Hu Y,Tao Q,Zhao Z,Zheng J,Han Y,Xu F,Luo M,Sollars PJ,Pu M,Pickard GE,So KF,Ren Cdoi
10.1038/ncomms14908subject
Has Abstractpub_date
2017-03-31 00:00:00pages
14908issn
2041-1723pii
ncomms14908journal_volume
8pub_type
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