Phillips D P, Farmer M E
Department of Psychology, Dalhousie University, Halifax, Nova Scotia, Canada.
Behav Brain Res. 1990 Nov 15;40(2):85-94. doi: 10.1016/0166-4328(90)90001-u.
This paper explores the nature of the processing disorder which underlies the speech discrimination deficit in the syndrome of acquired word deafness following from pathology to the primary auditory cortex. A critical examination of the evidence on this disorder revealed the following. First, the most profound forms of the condition are expressed not only in an isolation of the cerebral linguistic processor from auditory input, but in a failure of even the perceptual elaboration of the relevant sounds. Second, in agreement with earlier studies, we conclude that the perceptual dimension disturbed in word deafness is a temporal one. We argue, however, that it is not a generalized disorder of auditory temporal processing, but one which is largely restricted to the processing of sounds with temporal content in the milliseconds to tens-of-milliseconds time frame. The perceptual elaboration of sounds with temporal content outside that range, in either direction, may survive the disorder. Third, we present neurophysiological evidence that the primary auditory cortex has a special role in the representation of auditory events in that time frame, but not in the representation of auditory events with temporal grains outside that range.
本文探讨了加工障碍的本质，该障碍是后天性词聋综合征中言语辨别缺陷的基础，其从病理学角度追溯至初级听觉皮层。对该障碍相关证据的批判性审视揭示了以下几点。首先，该病症最严重的形式不仅表现为大脑语言处理器与听觉输入的隔离，甚至还表现为对相关声音的感知精细化过程的失败。其次，与早期研究一致，我们得出结论，词聋中受干扰的感知维度是时间维度。然而，我们认为这并非听觉时间加工的普遍障碍，而是主要局限于对毫秒到几十毫秒时间框架内具有时间内容的声音的加工。超出该范围的任何方向上具有时间内容的声音的感知精细化过程可能不受该障碍影响。第三，我们提供神经生理学证据表明，初级听觉皮层在该时间框架内听觉事件的表征中具有特殊作用，但在该范围之外具有时间粒度的听觉事件的表征中则没有。
