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    题名: Detection of sinusoidal amplitude modulation in logarithmic frequency sweeps across wide regions of the spectrum
    作者: Hsieh,IH;Saberi,K
    贡献者: 認知與神經科學研究所
    关键词: AUDITORY-CORTEX;MIXED MODULATION;SPEECH;DISCRIMINATION;SELECTIVITY;PERCEPTION;SOUNDS;NOISE;LATERALIZATION;SENSITIVITY
    日期: 2010
    上传时间: 2012-03-27 18:21:25 (UTC+8)
    出版者: 國立中央大學
    摘要: Many natural sounds such as speech contain concurrent amplitude and frequency modulation (AM and FM), with the FM components often in the form of directional frequency sweeps or glides. Most studies of modulation coding, however, have employed one modulation type in stationary carriers, and in cases where mixed-modulation sounds have been used, the FM component has typically been confined to an extremely narrow range within a critical band. The current study examined the ability to detect AM signals carried by broad logarithmic frequency sweeps using a 2-alternative forced-choice adaptive psychophysical design. AM-detection thresholds were measured as a function of signal modulation rate and carrier sweep frequency region. Thresholds for detection of AM in a sweep carrier ranged from 8 dB for an AM rate of 8 Hz to -30 dB at 128 Hz. Compared to thresholds obtained for stationary carriers (pure tones and filtered Gaussian noise), detection of AM carried by frequency sweeps substantially declined at low (12 dB at 8 Hz) but not high modulation rates. Several trends in the data, including sweep- versus stationary-carrier threshold patterns and effects of frequency region were predicted from a modulation filterbank model with an envelope-correlation decision statistic. (C) 2010 Elsevier B.V. All rights reserved.
    關聯: HEARING RESEARCH
    显示于类别:[認知與神經科學研究所 ] 期刊論文

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