The current position relating to animal hypnosis in relation to human hypnosis is briefly reviewed and it is suggested that progress in animal studies may reactivate the old controversy as to whether there is any useful analogy. The present results arose as serendipity in another study in which 88 S`s were tested on the SHSS : A and then divided into a placebo group receiving nicotinic acid, and a drug group receiving diazepam plus nicotinic acid, and re-tested on the SHSS : B. Seventeen Ss dropped out before re-test. While both placebo and drug groups of males (n = 32) increased slightly on re-test, with the females (n=39) the placebo group decreased slightly and the drug group decreased significantly on re-test. It is suggested that these results can be compared with the animal studies using tranquillizing drugs and habituation as the results are similar, and support the fear hypothesis. It is suggested that, in the conditions of the experiment, a greater proportion of the females may have been situationally more fear-prone.