Fig. 2

ASR testing paradigm. Gap detection was composed of three types of trials: a silent period followed by a startle sound (solid black bar), i.e., “sound-off startle” or “SOS” trial (A), a background tone immediately followed by a startle sound, i.e., “no gap” or “NG” trial (B), and a background tone interrupted by a 50 ms silent period before reintroduction of the tone for 50 ms before the startle sound, i.e., “gap” or “G” trial (C). In each trial, Fmax (indicated by the arrow), the maximum force exerted during the startle response, was recorded.