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A computer search of the literature for papers indexed under "flashbacks" produced a list of 70 references, many found in publications on the topics of substance abuse and trauma. Several of these were letters or papers written in languages other than English. In all, the author reviewed 55 papers. Although most of these papers contained comments that addressed the subject matter to some extent as recurrences or reminiscences of past happenings, the variability in the use of the term leaves many unresolved questions regarding the veridicality of the imagery. Nothing in the presentations reviewed by the author clearly demonstrates the unidimensional nature of flashbacks nor any recognizable neurophysiological correlate. The content of a flashback appears to be at least as likely to be the product of imagination as it is of memory.
Fred H. Frankel (Sat,) studied this question.