Rauschecker J P, Tian B, Hauser M
Laboratory of Neurophysiology, National Institute of Mental Health, Poolesville, MD 20837, USA.
Science. 1995 Apr 7;268(5207):111-4. doi: 10.1126/science.7701330.
Neurons in the superior temporal gyrus of anesthetized rhesus monkeys were exposed to complex acoustic stimuli. Bandpassed noise bursts with defined center frequencies evoked responses that were greatly enhanced over those evoked by pure tones. This finding led to the discovery of at least one new cochleotopic area in the lateral belt of the nonprimary auditory cortex. The best center frequencies of neurons varied along a rostrocaudal axis, and the best bandwidths of the noise bursts varied along a mediolateral axis. When digitized monkey calls were used as stimuli, many neurons showed a preference for some calls over others. Manipulation of the calls' frequency structure and playback of separate components revealed different types of spectral integration. The lateral areas of the monkey auditory cortex appear to be part of a hierarchical sequence in which neurons prefer increasingly complex stimuli and may form an important stage in the preprocessing of communication sounds.
将麻醉后的恒河猴颞上回中的神经元暴露于复杂的声学刺激下。具有特定中心频率的带通噪声脉冲诱发的反应比纯音诱发的反应大大增强。这一发现导致在非初级听觉皮层的外侧带中发现了至少一个新的耳蜗定位区域。神经元的最佳中心频率沿前后轴变化，噪声脉冲的最佳带宽沿内外侧轴变化。当使用数字化的猴子叫声作为刺激时，许多神经元对某些叫声表现出偏好。对叫声频率结构的操纵以及单独成分的回放揭示了不同类型的频谱整合。猴子听觉皮层的外侧区域似乎是一个层次序列的一部分，其中神经元更喜欢越来越复杂的刺激，并且可能在交流声音的预处理中形成一个重要阶段。
