English: Supplementary Movie 1 Acute silencing of CaMKIIa (+) ILSCm neurons in a mouse blocks the innate defensive responses to upper field LS. Mouse is stimulated with the upper field LS alone or in combination with optogenetics inhibition of CaMKIIa (+) ILSCm neurons (4X playing speed). The duration of LS is indicated by the appearance of "Stimulus on" text, and the duration of continuous 588-nm laser is indicated by the appearance of yellow "Light on" text.