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Most of the studies of the effects of ECT on animals were done in the 1940s and '50s. There are at least seven studies documenting brain damage in shocked animals (cited by Friedberg in Morgan, 1991, p. 29). The best known study is that of Hans Hartelius (1952), in which brain damage was consistently found in cats given a relatively short course of ECT. He concluded: "The question of whether or not irreversible damage to the nerve cells may occur in association with ECT must therefore be answered in the affirmative."
Human autopsy studies were done on persons who died during or shortly after ECT (some died as a result of massive brain damage). There are more than twenty reports of neuropathology in human autopsies, dating from to 1940s to 1978 (Morgan, 1991, p. 30; Breggin, 1985, p.4). Many of these patients had what is called modern or "modified" ECT.