STIMULUS RISE TIME, INTENSITY, AND BANDWIDTH EFFECTS ON ACOUSTIC STARTLE AMPLITUDE AND PROBABILITY
STIMULUS RISE TIME, INTENSITY, AND BANDWIDTH EFFECTS ON ACOUSTIC STARTLE AMPLITUDE AND PROBABILITY
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DOI：
10.1111/j.1469-8986.1986.tb00682.x
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发表时间：
1986-11-01
期刊：
影响因子：
3.7
通讯作者：
BERG, WK
中科院分区：
文献类型：
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作者：
BLUMENTHAL, TD;BERG, WK
眶周肌电反应的幅度和概率进行了评估，为各种刺激。在实验1中，50 ms持续时间的宽带噪声（20- 20 K Hz）和音调（1000 Hz），在95和100 dB（A），上升/下降时间为2.5，10和25 ms，提出。噪声刺激比音调更有效的反应幅度和概率。刺激强度影响音调的两个措施，但只有噪音的反应幅度。增加刺激上升/下降时间对噪声没有显著影响，但导致音调的概率降低。在实验2中，50 ms持续时间1000 Hz的音调，在98和102 dB（A），上升/下降时间为1，2.5，5和10 ms。响应幅度不受上升/下降时间变化的影响，但上升/下降时间从5 ms增加到10 ms导致概率降低。这些数据表明，惊吓反应可以反映刺激带宽，强度和上升/下降时间的操纵，惊吓幅度和概率以不同的方式反映这些操纵。这两个反应措施可能表明部分独立的潜在机制的活动，与惊吓“触发器”确定响应概率和惊吓“放大器”确定阈值以上刺激的响应幅度。
The amplitude and probability of periorbital EMG responses were assessed for a variety of stimuli. In Experiment 1, 50-ms duration broadband noise (20-20K Hz) and tones (1000 Hz), at 95 and 100 dB(A), with rise/fall times of 2.5, 10, and 25 ms, were presented. Noise stimuli were more effective than tones for both response amplitude and probability. Stimulus intensity affected both measures for tones, but only response amplitude for noise. Increasing stimulus rise/fall time had no significant effect for noise, but resulted in lower probability for tones. In Experiment 2, 50-ms duration 1000 Hz tones, at 98 and 102 dB(A), with rise/fall times of 1, 2.5, 5, and 10 ms were presented. Response amplitude was not affected by rise/fall time changes, but increasing rise/fall time from 5 to 10 ms resulted in lower probability. These data show that the startle response can reflect manipulations of stimulus bandwidth, intensity, and rise/fall time, and that startle amplitude and probability reflect these manipulations in different ways. The two response measures may indicate the activity of partially independent underlying mechanisms, with a startle "trigger" determining response probability and a startle "amplifier" determining response amplitude for suprathreshold stimuli.