Skip to main content
. 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 5.

Figure 5

As in Experiment I, 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 with 7-s unmasked novel CSs. These CSs were paired with one of the Phase I stimuli. Group BLOCK CSs were paired with CS1+. Group CONTROL CSs were paired with CS1−. The blocking stimulus was presented during the last second of all trials. The UCS coterminated with the blocking stimulus on all CS+ trials.