Audiovisual stimulus presentation. Short movies of vocalizations or other motion was dissected into auditory and visual components and presented. (a) Each cell was tested with the auditory alone (A), a static image from the movie (Vs), a combination of the auditory and the static image (AVs), a version of the movie without any sound (Vm) and the movie plus the sound (AVm); Adapted from
Sugihara et al. (2006). (b) In addition each cell was tested with an offset audio-visual stimulus (Async) where the auditory stimulus, in this case, a vocalization, preceded the face movie stimulus.