Temporal resolution of the human primary auditory cortex in gap detection
Temporal resolution of the human primary auditory cortex in gap detection
复制标题
间隙检测中人类初级听觉皮层的时间分辨率
作者：
A. Rupp;A. Gutschalk;Sebastian Hack;M. Scherg
通过记录插入600 ms宽带噪声脉冲中间的3、6和9 ms间隙诱发的磁中潜伏期场（MAEF），研究初级听皮层的时间分辨力。时空源建模表明，一个显着的神经代表所反映的MAEF反应是目前在间隙持续时间低至3 SMS。由噪声突发的开始、间隙和偏移引起的MAEF波形的比较表明，阈值附近的差距相关响应在很大程度上由跟随差距的突发的开始决定。电生理导出的最小可检测间隙非常类似于在相同受试者中获得的2.0 ms的心理声学阈值。
The temporal resolution of the primary auditory cortex was studied by recording the magnetic middle latency fields (MAEF) evoked by gaps of 3, 6 and 9 ms inserted in the middle of 600 ms broadband noise bursts. Spatio-temporal source modelling showed that a significant neural representation as reflected by MAEF responses is present at gap durations as low as 3 sms. The comparison of the MAEF waveforms elicited by the onset, gap and offset of the noise bursts indicates that the gap related response near threshold is largely determined by the onset to the burst following the gap. The electro-physiologically derived minimum detectable gap closely resembled the psychoacoustic threshold of 2.0 ms obtained in the same subjects.