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. Author manuscript; available in PMC: 2009 Nov 1.
Published in final edited form as: Dev Psychobiol. 2008 Nov;50(7):647–664. doi: 10.1002/dev.20335

Figure 1.

Figure 1

Illustration of stimuli used in the interstimulus interval (ISI) discrimination (Experiment 1a) and temporal uncertainty (Experiment 1b) procedures. All CSs preceded, overlapped, and coterminated with a 100 ms shock US. The CS durations were 380 ms (short CS) and 980 ms (long CS) with ISIs between CS and US onset of 280 and 880 ms, respectively. Adaptive CRs were recorded from the last 200 ms of the CS period prior to US onset. Tasks were identical in design with the exception that the short CS and long CS were of different sensory modalities in ISI discrimination while the same CS was used for both ISIs in temporal uncertainty (Reprinted from Brown et al., 2008).