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His experiments were intended to determine the absolute and difference, or differential, thresholds. Weber was able to define absolute and difference threshold statistically, which led to the establishment of Weber's Law and the concept of just noticeable difference to describe threshold perception of stimuli.
The absolute threshold can be compared to the difference threshold, which is the measure of how different two stimuli must be for the subject to notice that they are not the same. [ 2 ] Vision
The JND is a statistical, rather than an exact quantity: from trial to trial, the difference that a given person notices will vary somewhat, and it is therefore necessary to conduct many trials in order to determine the threshold. The JND usually reported is the difference that a person notices on 50% of trials.
Regardless of the sensory domain, there are three main areas of investigation: absolute thresholds, discrimination thresholds (e.g. the just-noticeable difference), and scaling. A threshold (or limen) is the point of intensity at which the participant can just detect the presence of a stimulus (absolute threshold [15]) or the difference between ...
The two different methods produce different thresholds [1] [2] and minimal audible field thresholds are often 6 to 10 dB better than minimal audible pressure thresholds. [2] It is thought that this difference is due to: monaural vs binaural hearing. With minimal audible field both ears are able to detect the stimuli but with minimal audible ...
In physiology, psychology, or psychophysics, a limen or a liminal point is a sensory threshold of a physiological or psychological response. Such points delineate boundaries of perception; that is, a limen defines a sensory threshold beyond which a particular stimulus becomes perceivable, and below which it remains unperceivable.
In electrophysiology, the threshold potential is the critical level to which a membrane potential must be depolarized to initiate an action potential.
A tone at the frequency of 4000 Hz is presented for 60 seconds at an intensity of 5 decibels above the patient's absolute threshold of hearing. If the patient stops hearing the tone before 60 seconds, the intensity level is increased by another 5 decibels with the procedure repeated until the tone can be heard for the full 60 seconds or until no decibel level can be found where the tone can be ...