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强度辨别阈
相关语句
  intensity difference limen
     Intensity difference limen (ΔI) was measured in normal subjects with theamplitude modulation (AM)method.
     本工作用调幅检测法测定了正常受试者的强度辨别阈(△I)。
短句来源
  “强度辨别阈”译为未确定词的双语例句
     With a newly designed FM/AM/φM sound stimulator, accurate measurements of auditory discriminating thresholds of frequency (Δf), intensity (ΔI) and phase (Δφ) were performed psychophysically in humans and electrophysiologically in guinea pigs.
     本工作用一种结构简单操作方便的新型调频调幅调相声刺激器,准确地在人(用心理物理方法)和豚鼠(用电生理方法)测定了听觉的频率辨别阈(Δf)、强度辨别阈(ΔI)和相位辨别阈(Δ)。
短句来源
     Measurements of auditory discriminating thresholds of frequency (△f), phase (△φ) and intensity (△I) of repetitive clicks and hearing thresholds (HT) of pure tones were performed in human subjects with no history of ear pathology, the range of age being 17-67 years.
     测定了不同年龄无耳病史受试者对重复短声的频率辨别阈(△f)、相位别阈(△φ)、强度辨别阈(△I)及对不同频率纯音的听阈(HT),分析了△f、△φ、△I及HT与年龄的关系。
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  相似匹配句对
     Measurement of auditory discriminating thresholds
     听觉辨别的测定
短句来源
     threshold intensity had no significant difference.
     强度变化不明显。
短句来源
     According to the model, limen of logarithm loudness is independent of intensity.
     这个模型认为 ,响度对数的辨别不随信号强度变化 .
短句来源
     Intensity difference limen (ΔI) was measured in normal subjects with theamplitude modulation (AM)method.
     本工作用调幅检测法测定了正常受试者的强度辨别(△I)。
短句来源
     LOCALIZATION OF SOUND SOURCE AND DIFFERENTIAL THRESHOLD OF SOUND SOURCE POSITION
     声源定位与声源位置辨别
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Psycho-physiological studies on human subjects were carried out in highmountains at an altitude of 4,000 m. above sea level. The tests employedwere: (1) visual functions (color discrimination, depth perception and criticalflicker frequency), (2)auditory functions (auditory threshold, auditory fatigue,intensity discrimination and sound localization); (3)attention steadiness; (4)memory and association; (5) four fundamental operations; (6) hand-footcoordination and reaction time;(7) pursuit movement and motor skill....

Psycho-physiological studies on human subjects were carried out in highmountains at an altitude of 4,000 m. above sea level. The tests employedwere: (1) visual functions (color discrimination, depth perception and criticalflicker frequency), (2)auditory functions (auditory threshold, auditory fatigue,intensity discrimination and sound localization); (3)attention steadiness; (4)memory and association; (5) four fundamental operations; (6) hand-footcoordination and reaction time;(7) pursuit movement and motor skill. Theresults show that some of these mental functions seemed somewhat changedunder hypoxia. In general, there were no apparent effects of hypoxia on brainfunctions and mental Performances in high mountains at an altitude of 4,000m. above sea level.

本文报告了海拔4,000米左右低氧对脑功能的影响,并观察了高原现场驾驶汽车劳动6小时后脑功能的变化。所用测试指标如下:视觉机能(颜色分辨、深度觉、视觉疲劳和视觉注意稳定性等测验);听觉机能(听阈测验、听觉疲劳、声音强度辨别阈和声源定向等测定);记忆联想和演算能力测定;反应时和手脚协同活动反应;驾驶追踪动作和汽车穿桩实验等多种综合指标。结果表明,一些指标有影响,另一些指标没有影响。总的看来,海拔4,000米左右的高原现场对人的感觉机能和脑功能没有明显的影响。

Intensity difference limen (ΔI) was measured in normal subjects with theamplitude modulation (AM)method. When the carrier is a white noise at 20-30dB SL and the modulating signal is a quasi-rectangular pulse of 200 ms duration,the mean ΔI amounts to only 0. 27 dB which is smaller than results of any previousdetermination using method of either AM or signal comparison of a white noise ora pure tone (Tab.1). Change of the rise and fall time of the modulating signalfrom 0 to 15 ms affects very little theΔI values.ΔI...

Intensity difference limen (ΔI) was measured in normal subjects with theamplitude modulation (AM)method. When the carrier is a white noise at 20-30dB SL and the modulating signal is a quasi-rectangular pulse of 200 ms duration,the mean ΔI amounts to only 0. 27 dB which is smaller than results of any previousdetermination using method of either AM or signal comparison of a white noise ora pure tone (Tab.1). Change of the rise and fall time of the modulating signalfrom 0 to 15 ms affects very little theΔI values.ΔI "sharpens" with increaseof the modulation duration t and reaches a limit at a critical time, T, of about 100ms. ThereafterΔI approximates to a constant K.When t is smaller than T,theΔI-t relationship can be described byΔI=K(T/t)~(1/2).

本工作用调幅检测法测定了正常受试者的强度辨别阈(△I)。当载波为白噪声,其强度为阈上20—30dB,调幅信号为一波宽200ms的准矩形波时,△I平均只0.27dB,比以往用白噪声或纯音调幅法和信号比较法测得的结果都小(表1)。改变调幅波的上升下降时间(0—15ms)对△I无明显影响。△I随调幅时程t的增长而变小,并以t达到临界时间T(约100ms)时为极限。此后△I即等于常数K。当t 小于T时,△I与t的函数关系可表达为△I=K(T/t)~(1/2)。

AM-evoked slow cortical responses (SCR) were recorded in awake guinea pigs and the response thresholds (ΔI) in terms of amplitude increment in dB were determined. A qua-sirectangular pulse of 200 ms duration and with a repetition rate of I/sec served as the modulator. The typical AM-evoked SCR assumes a positive-negative-positive triphasic waveform appearing 40 -200 ms after the on-set or off-set of modulation. For white noise, for repetitive clicks (1000 pps) and for pure tones (125 Hz-16 kHz) in a very wide...

AM-evoked slow cortical responses (SCR) were recorded in awake guinea pigs and the response thresholds (ΔI) in terms of amplitude increment in dB were determined. A qua-sirectangular pulse of 200 ms duration and with a repetition rate of I/sec served as the modulator. The typical AM-evoked SCR assumes a positive-negative-positive triphasic waveform appearing 40 -200 ms after the on-set or off-set of modulation. For white noise, for repetitive clicks (1000 pps) and for pure tones (125 Hz-16 kHz) in a very wide carrier level range (30-90 dB SPL), the ΔI values are only around 0.5 dB, quite close to those for human obtained by psychophysical methods, suggesting that the SCR ΔI values can represent the intensity difference limens for the animals, A ΔI curve for guinea pig, i.e., the functional curve of A/ versus, I, is constructed. This ΔI curve is supposed to be the first complete and convincing one for animals.

在清醒豚鼠记录了声音调幅诱发的皮层慢反应(SCR),并测定了反应阈(△I,以加幅的dB数表示)。调制波是时程200ms的准矩形波,每秒一次。调幅诱发的典型SCR呈正负正三相波,出现在调制开始或结束后40—200ms内。用白噪声、重复短声和纯音作载波,在基幅强度30—90dBSPL的范围内△I仅0.5dB左右,和人的心理物理测试结果相近,表明用SCR测得的△I能代表动物的强度辨别阈。本实验所得的豚鼠△I与I的函数曲线,可算是动物第一条较完整的△I曲线。

 
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