This research was supported by NSF Grant BNS-81-20476, NIMH Grant MH- 47840 & MH-25642, NINCDS Grant NS-18033, Research Scientist Develop- ment Award MH-00004, a grant from the Air Force Office of Scientific Re- search and the State of Connecticut. Some of the results in this chapter were submitted to the Yale Graduate School in partial fulfillment of the requirement for a Ph.D. to Janice Hitchcock. Our sincere thanks are extended to Lee Schlesinger, who tested many of the animals used for these studies, to Bruce Kapp for helpful discussions about the brainstem projections of the amygdala, to Ariel Deutsch and Robert Roth for collaboration on the PHA--L studies, to James Cassella and John Kehne for comments on the manuscript, and to Leslie Fields for help in typing. Special thanks are extended to Don Weisz for alerting us some years ago to the importance of the amygdala in fear.
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