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Visual or spatial extinction, also known as pseudohemianopia, is the inability to perceive two simultaneous stimuli in each visual field. [15] It is thus believed that extinction is caused by sensory neglect, and that extinction reflects an attentional deficit rather than a contralesional deficit in primary perceptual processing. [16]
This photo shows tactile markings identifying stairs for visually impaired people. The somatosensory system , or somatic sensory system is a subset of the sensory nervous system . It has two subdivisions, one for the detection of mechanosensory information related to touch, and the other for the nociception detection of pain and temperature. [ 1 ]
When presented with stimuli, eye saccades from fixation point are more common in extinction patients, are longer in duration, and show ipsilesional bias in movement. [6] Some evidence for a slight increase in detection of eccentric stimuli in the ipsilesional visual field – i.e. slightly improved peripheral vision. [6]
The tactile image is then projected onto the tongue via the ribbon cable where the tongue's receptors pick up the signal. After training, subjects are able to associate certain types of stimuli to certain types of visual images. [7] [41] In this way, tactile sensation can be used for visual perception.
Stereognosis (Tactile Gnosis) is defined as the ability to tell the difference and identify objects via touch in the absence of visual or auditory contact. The subject will need to be able to recognize temperature, spatial properties, texture, and size to reach an accurate conclusion to what the object is. [ 13 ]
Tactile defensiveness: negative reaction to tactile stimuli; Visual perceptual deficits: poor form and space perception and visual motor functions; Somatodyspraxia: poor motor planning (related to poor information coming from the tactile and proprioceptive systems) Auditory-language problems
Tactile stimulation is used in clinical psychology through the method of prompting. Prompting is the use of a set of instructions designed to guide a participant through learning a behavior. A physical prompt involves stimulation in the form of physically guided behavior in the appropriate situation and environment.
The visual system is very static, in that it does not move around much, but the hands and other parts used in tactile sensory collection can freely move around. This movement of the hands must be included in the mapping of both the tactile and visual sensations, otherwise one would not be able to comprehend where they were moving their hands ...