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首页> 外文会议>17th international conference on biomagnetism advances in biomagnetism - Biomag2010 >Observing Mismatch Fields from Human Auditory Discrimination of Heavily Damped Frequency Component Adjustments
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Observing Mismatch Fields from Human Auditory Discrimination of Heavily Damped Frequency Component Adjustments

机译：从人耳听觉辨别重阻尼频率分量调整中观察到不匹配字段

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The aim of this study was to test the brain's ability to discriminate frequency shifts of heavily damped components of a complex sound. Since the auditory system is tonotopically organized, heavily damped transients should generate more activity than lightly damped partials. The increased activity increases the 'categorical resolution'. This work attempts to test this by detecting the 'Mismatch Field' from human subjects during a defined hearing task. Since the hearing system evolved in a complex environment, complex synthetic audio samples are constructed similar to the sound of a guitar. The sounds presented to the subject consisted of repetitive 'standard' tones, with occasional 'deviant' epochs. Standards differ from deviants in that one of the anharmonic frequency components of the heavily damped partials is transposed. The partials representing the more sustained vibrations of the string are identical for both standard and deviant. The randomized samples were presented to the subject's right ear with an average random inter-stimulus interval of 1 second over a duration of 17 minutes. The subject was then submitted to an active discrimination task where they actively attempted to count the deviants. The magnetic field responses from the brain were then detected using whole head magnetometer. The grand averaged samples were then band-pass and localized. Although the subjects could not actively discriminate the sound samples, mismatches were observed originating from the auditory cortex. These results suggest the auditory system is able to distinguish at a sensory level, shifts in the heavily damped spectral structure of complex sounds even though some cannot do so attentively. This could be due to the greater analysis given by the human brain to determining the pitch center rather then the sound timbre, yet some trained musicians have the ability to distinguish these subtle differences.
机译：这项研究的目的是测试大脑辨别复杂声音中高阻尼分量的频移的能力。由于听觉系统是局部性地组织的，因此高阻尼瞬态应该比轻阻尼部分产生更多的活动。活动的增加增加了“分类分辨率”。这项工作试图通过在定义的听力任务中检测到人类受试者的“失配场”来对此进行测试。由于听力系统是在复杂的环境中发展的，因此构造复杂的合成音频样本类似于吉他的声音。呈现给对象的声音包括重复的“标准”音调，偶尔还会出现“异常”时期。标准与偏差的不同之处在于，对高阻尼分量的非谐频率分量之一进行了转置。对于标准弦和偏差弦，代表弦线更持久振动的部分相同。将随机样本以平均随机刺激间隔1秒（在17分钟的持续时间内）呈现给受试者的右耳。然后，对象被送往积极的歧视任务，他们在其中积极尝试计算偏差。然后使用全头磁强计检测来自大脑的磁场响应。然后对总体平均样本进行带通和定位。尽管受试者无法积极地区分声音样本，但观察到听觉皮层不匹配。这些结果表明，听觉系统能够在感觉水平上进行区分，即使某些声音不能专心地进行，在复杂声音的高阻尼频谱结构中也会发生变化。这可能是由于人脑对确定音调中心而不是声音音色进行了更大的分析，但是一些受过训练的音乐家能够区分这些细微的差异。

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