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Top-Down Control of Rhythm Perception Modulates Early Auditory Responses

机译:高压控制节奏感知调制早期听觉反应

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Our perceptions are shaped by both extrinsic stimuli and intrinsic interpretation. The perceptual experience of a simple rhythm, for example, depends upon its metrical interpretation (where one hears the beat). Such interpretation can be altered at will, providing a model to study the interaction of endogenous and exogenous influences in the cognitive organization of perception. Using magnetoencephalography (MEG), we measured brain responses evoked by a repeating, rhythmically ambiguous phrase (two tones followed by a rest). In separate trials listeners were instructed to impose different metrical organizations on the rhythm by mentally placing the downbeat on either the first or the second tone. Since the stimulus was invariant, differences in brain activity between the two conditions should relate to endogenous metrical interpretation. Met-rical interpretation influenced early evoked neural responses to tones, specifically in the upper beta range (20-30 Hz). Beta response was stronger (by 64% on average) when a tone was imagined to be the beat, compared to when it was not. A second experiment established that the beta increase closely resembles that due to physical accents, and thus may represent the genesis of a subjective accent. The results demonstrate endoge-nous modulation of early auditory responses, and suggest a unique role for the beta band in linking of endogenous and exogenous processing. Given the suggested role of beta in motor processing and long-range intracortical coordination, it is hypothesized that the motor system influences metrical interpretation of sound, even in the absence of overt movement.
机译:我们的看法是通过外在刺激和内在解释的形状。例如,简单的节奏的感知体验取决于其韵律解释(其中一个人听到节拍)。这种解释可以随意改变,提供模型,以研究认知组织在认知组织中内源性和外源性影响的相互作用。使用磁脑(MEG),我们测量了通过重复,有节奏地模糊的短语引起的脑响应(两个色调,然后休息)。在单独的试验中,指示侦听者通过精神上将下跳或第二个音调在精神上放在节奏中,对节奏进行不同的韵律组织。由于刺激性不变,因此两个条件之间的大脑活动的差异应与内源性估算解释有关。欧马克基解释影响了早期诱发的神经反应对音调,特别是在上β(20-30Hz)中。当一个音调被想象为节拍时,β响应更强(平均平均为64%),而不是。第二个实验确定,β增加到严格类似地,由于物理口音,因此可能代表主观口音的成因。结果证明了早期听觉反应的内外调节,并表明了β带连接内源性和外源性加工方面的独特作用。鉴于Beta在电机加工中的建议作用和远程内在协调,也是假设电动机系统影响声音的韵律解释,即使在没有公开运动的情况下也是如此。

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