Abstract

The inability of temporal lobe damaged patients to perform the ABLB and satisfactorily balance tones of equal intensity has been called “decruitment”. Poor performance has been attributed to an abnormally slow growth of loudness in the ear contralateral to the lesion. Seven patients with temporal lobe damage, seven with brain damage exclusive of the auditory system, and seven normals were asked to match loudness (ABLB) and to build a Sone scale by halving and doubling the loudness of a 1000 Hz tone. The normals performed all tasks well. The braindamaged (non-auditory system) showed slight variation on the ABLB, and normal Sone scales. The temporal lobe group evidenced decruitment on the ABU, but produced normal Sone scales. Decruitment is apparently not an abnormal growth of loudness, but rather the inability to integrate and relate auditory tasks presented dichotically.

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