math, physics, and chemistry : medicopsychology : traditional Chinese medicinal materials > absolute threshold



Contents ·No. 1 ·English Expression ·Containing Phrases ·More results... No. 1 绝对阈限 绝对阈限 　　Absolute threshold (absolute threshold) is reliable for the minimal intensity of stimulation caused by sensory (physical energy). Determine the absolute threshold detection method is the implementation of operations: The Tai or a small change from large to small amount of stimulation, or randomly show different strength of stimulation to detect the feeling people respond to different stimuli, which create a psychological measure function (psychometric function), plotted for each stimulus intensity (x-axis coordinate) is aware of the percentage (y-axis coordinates). Psychophysical function curve does not exist a unique, real absolute threshold, because the intensity is not an absolute value, than it once, feeling always bound to happen reliably, less than it once, feeling completely occur. Mental capacity to make almost always a smooth curve s-shaped curve, indicating that the increase with the amount of stimulation, awareness of the stimulus does not occur to the gradual increase in the awareness rate, and finally always aware of the correct stimulus. This curve means: feeling from scratch is a gradual process rather than mutations. Moreover, the existence of such a situation: people's behavior that they seem to perceive the stimulus, even if the stimulus intensity is below the threshold. This phenomenon is called "subliminal perception." In addition, there is a regular tendency to response bias (responsebias), is due to various non-sensory factors, people prefer to respond in a special way, a common form: hope, expectation, and habit. These forms of people's feeling of being changed or distorted. To this end, usually in the sense of exploration work to monitor experimental techniques used to check whether there is response bias. 　　View of the above, in order to make a relatively suitable threshold that we used on the absolute threshold that definition: half (50%) of the probability of the stimulus can be the smallest amount of sense, called the absolute threshold. Here, 50% chance that the threshold is relatively clear of in order to measure the threshold of the actual implementation of the operation, therefore this definition is also called operational definition (operational definition). 　　Absolute calibration of the absolute threshold sensitivity. The lower the absolute threshold, which can cause the amount of sensory stimulation to be smaller and more, the higher the absolute sensitivity, that is more sensitive to stimuli. In other words, absolute threshold, and inversely proportional to the absolute sensitivity. With the letter s stands for absolute sensitivity, with r represent absolute thresholds, the relationship between the two figures can be expressed as: s = 1 / r Translated by Google English Expression :  absolute threshold Containing Phrases taste absolute threshold