Extinction in Goldfish: Facilitation by Intracranial Injection of RNA from Brains of Extinguished Donors

Science  05 Jun 1970:
Vol. 168, Issue 3936, pp. 1234-1236
DOI: 10.1126/science.168.3936.1234


Extracts rich in RNA were prepared from the brains of goldfish that had acquired and then extinguished a light-signaled avoidance to shock in an aquatic shuttle-box. Recipient fish injected intracranially with such extracts extinguished the response significantly faster than those injected with extracts prepared from brains of naive donors.