Popova N S, Dovedova E L
Zh Vyssh Nerv Deiat Im I P Pavlova. 1984 Sep-Oct;34(5):926-31.
Complex study of the opioid tetrapeptide amid (TPA) effect on metabolism and neurophysiological processes of different cortical areas, caudate nucleus n. accumbens allowed to detect prolonged (several days) specific action on these structures. The influence was manifested in certain changes of transmitter metabolism, background bioelectric activity, as well as in changes of EEG reactions to adequate afferent signals. The duration of the detected changes significantly exceeded the duration of anti-pain TPA effect.