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(?) major, (underlined)Apr.9, 1960 III  20

frequently repeated.
  In fact, by the time I had repeated my "Coooooooo" notes many times, both birds were performing a great many Tsh's, preening movements, and gaping and retching movements, one right after the other, in more or less a complete "jumble," one right after the other in almost any order.
  When I began to leave pauses between my "Cooooooos." Both birds continued Tsh's, preening movements, and gaping and retching movements for at least several records after a "Coooooo" had stopped. They were also apt to start them again if David and I began to talk in our normal voices a few records after a "Coooooo," (this is something they have never done before when we have talked together). I also got the impression that they were apt to perform a particularly vigorous burst of preening immediately after a "Coooooo,"
(?) of whether or not David and I were talking. Such preening looked very much like an "expression" of "relief."
  I can't imagine what the significance of this behavior could have been unless my "Cooooooo"s were literally hurting their ears. If so, it is interesting that they performed preening movements as a reaction to a type of discomfort which preening couldn't possibly help to remove!!! (as to remove are underlined)
  The only fact which might suggest that this behavior was not a reaction to discomfort or pain was that M reacted sooner than Hrr, and continued to react more strongly (i.e. to perform more Tsh's, preening, and gaping & retching) than Hrr throughout the experiment.