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Contact: Dr. Gregory J. Quirk
University of Puerto Rico, Medical Sciences Campus

Rats Freezing to a Tone (1 of 2)

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Caption: Laboratory rats listening to a tone (indicated by light on bottom right) that had been paired with shock. Control rats froze with fear but rats injected with brain-derived neurotrophic factor (BDNF) were not afraid, continuing to press a bar for food.

Credit: Dr. Gregory Quirk, Univ. Puerto Rico

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Related news release: Inducing a safety memory in the brain

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