Alho K, Huotilainen M, Tiitinen H, Ilmoniemi R J, Knuutila J, Näätänen R
Department of Psychology, University of Helsinki, Finland.
Neuroreport. 1993 Apr;4(4):391-4. doi: 10.1097/00001756-199304000-00012.
Responses of the human brain to a complex sound pattern were recorded with a 24 channel magnetometer. The sound pattern consisted of 9 successive 50 ms segments, each with a different frequency. An infrequent change in the frequency of one of the segments elicited a magnetic mismatch response (MMNm) which peaked at about 200 ms after the deviant segment onset and resembled the electrical mismatch negativity (MMN). The equivalent current dipole which best explained the MMNm was located in the supratemporal auditory cortex, suggesting that a memory trace for the sound pattern was stored in that region.
用24通道磁力计记录了人类大脑对复杂声音模式的反应。该声音模式由9个连续的50毫秒片段组成，每个片段都有不同的频率。其中一个片段频率的罕见变化引发了磁失配反应（MMNm），该反应在异常片段开始后约200毫秒达到峰值，类似于电失配负波（MMN）。最能解释MMNm的等效电流偶极位于颞上听觉皮层，这表明声音模式的记忆痕迹存储在该区域。
