Abstract
IN STUDIES employing the method of double simultaneous stimulation it was found that a subject may give one of three types of responses. Depending on various factors in the test situation, the subject may (a) perceive and correctly localize both stimuli (expected normal); (b) perceive and correctly localize one stimulus but not perceive the other, even though the latter was perceptible to the patient on single stimulation, and (c) perceive and correctly localize one stimulus and perceive but mislocalize the other. The first response needs no comment, for it is the expected normal. The second type of response was reported in a series of communications under the heading of the phenomenon of extinction.1The third type of response has been described to some extent in previous articles2under the heading of the phenomenon of displacement. However, the last phenomenon has not been stressed to any extent. It is
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