Figure 1.
Timing of CS+ and CS− trial types. Two hundred trials of two conditioned stimuli were presented (100 CS+ and 100 CS−). Each CS lasted 850 msec and each trial lasted 2000 msec with a variable intertrial interval (ITI) of 5–7 sec. Shaded areas indicate the time window that was sampled to classify eyeblinks as CRs. (CS) conditioned stimulus, (US) unconditioned stimulus, (CR) conditioned response, (ISI) interstimulus interval.
