Neuro-physiological basis of sensations Visual senses Muscle movement sensations, static sensations

The lower absolute sensitivity threshold of sensation, which first appears under the weakest effect of the stimulant, is called. The presence of a certain sensation under the influence of a large-scale exposure, the disappearance of the sensation as a result of increasing exposure, or the painful sensation is called a high absolute sensation threshold .
Absolute sensitivity is the ability to perceive weak stimuli, and discrimination sensitivity is the ability to perceive weak differences between stimuli. The initial sensation that occurs under the influence of the smallest size of the sensoris called the absolute threshold of sensitivity . Physiologist GV Gershuni and his colleagues have shown that sounds below the sensory threshold can cause changes in brain electrical activity and pupil dilation. The sphere of action of sensitizers that do not create sensations was called "subsensory sphere" by GV Gershuni.
There is an inverse relationship between sensitivity (threshold) and the strength of the stimulus: the greater the force required to produce the sensation, the lower the sensitivity in the person. Sensitivity thresholds are different for each person.
The size of the lower and upper absolute thresholds changes under the influence of various conditions: human age and activity characteristics, receptor performance characteristics, strength and duration of exposure, etc. A high level of sensitivity is achieved during adolescence.
In addition to absolute sensitivity, there is also relative sensitivity - sensitivity to changes in the intensity of the effect. Relative sensitivity is measured by the onset of differentiation . The smallest addition to the power of a sessant in an activity that produces a barely perceptible difference as the power of the senses is called the discrimination threshold or the multidimensional threshold.


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