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. Author manuscript; available in PMC: 2017 Jan 29.
Published in final edited form as: Behav Neurosci. 2010 Aug;124(4):478–489. doi: 10.1037/a0019927

Figure 1.

Figure 1

We manipulated awareness in a fear conditioning task, and assessed the effects of conditioning without awareness on subsequent learning. (a) During Phase I, we presented 20 differential conditioning trials. We presented 15-ms CSs that were masked by a 7.985-s masking stimulus to block CS1 perception. We presented an immediate shock UCS on CS1+ trials. (b) During Phase II, we split participants into two groups that underwent differential acquisition and extinction with 8-s unmasked CSs. We exposed one group to the same CSs (CSS) and another to different CSs (CSD). For both groups, the UCS coterminated with the CS+.