Organization of auditory areas in the superior temporal gyrus of marmoset monkeys revealed by real-time optical imaging
Organization of auditory areas in the superior temporal gyrus of marmoset monkeys revealed by real-time optical imaging
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DOI：
10.1007/s00429-017-1574-0
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发表时间：
2018-05-01
影响因子：
3.1
通讯作者：
Song, Wen-Jie
中科院分区：
文献类型：
--
作者：
Nishimura, Masataka;Takemoto, Makoto;Song, Wen-Jie
灵长类动物听觉皮层的流行模型提出了一个核心带副耳带结构。该模型提出了三个听觉区域的侧带区域，但是，它可能包含更多，因为这个区域已经被映射到一个有限的空间分辨率。为了探索这种可能性，我们研究了听觉领域的侧带区域的绒猴使用高分辨率的光学成像技术。根据对纯音的反应，我们确定了上级颞回的多个区域。核心区的三个区域，初级区（A1），吻侧区（R），和嘴颞区，很容易确定其频率梯度和位置直接腹侧的外侧沟。三个带区被确定为频率梯度和相对位置A1和R，与以前的研究一致：尾外侧区，中间外侧区，和前外侧区（AL）。然而，在R和AL之间，我们发现了两个额外的区域。第一个位于R的尾腹侧，在腹尾方向上具有频率梯度，我们将其命名为内侧前外侧（MAL）区域。第二个是位于MAL和AL区域之间的一个没有明显tonotopy（NT）的小区域。MAL和NT区域均对宽范围的频率（至少2-24 kHz）作出反应。我们的研究结果表明，带区域caudoventral R比以前提出的更复杂，因此，我们呼吁目前的灵长类动物听觉皮层模型的改进。
The prevailing model of the primate auditory cortex proposes a core-belt-parabelt structure. The model proposes three auditory areas in the lateral belt region; however, it may contain more, as this region has been mapped only at a limited spatial resolution. To explore this possibility, we examined the auditory areas in the lateral belt region of the marmoset using a high-resolution optical imaging technique. Based on responses to pure tones, we identified multiple areas in the superior temporal gyrus. The three areas in the core region, the primary area (A1), the rostral area (R), and the rostrotemporal area, were readily identified from their frequency gradients and positions immediately ventral to the lateral sulcus. Three belt areas were identified with frequency gradients and relative positions to A1 and R that were in agreement with previous studies: the caudolateral area, the middle lateral area, and the anterolateral area (AL). Situated between R and AL, however, we identified two additional areas. The first was located caudoventral to R with a frequency gradient in the ventrocaudal direction, which we named the medial anterolateral (MAL) area. The second was a small area with no obvious tonotopy (NT), positioned between the MAL and AL areas. Both the MAL and NT areas responded to a wide range of frequencies (at least 2-24 kHz). Our results suggest that the belt region caudoventral to R is more complex than previously proposed, and we thus call for a refinement of the current primate auditory cortex model.