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Partial reinforcement training and retrieval pre-exposure did not alter retention to the auditory cue during retrieval. (a) Rats were trained to 100% or 50% reinforcement auditory fear conditioning with or without ‘retrieval pre-exposure' the day before training. The groups that received partial reinforcement froze significantly more during the training session (b), but all groups showed equal retention to the auditory cue during the retrieval session (c). *P<0.05 from no retrieval.
