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Sensory deprivation or perceptual isolation [1] is the deliberate reduction or removal of stimuli from one or more of the senses. Simple devices such as blindfolds or hoods and earmuffs can cut off sight and hearing, while more complex devices can also cut off the sense of smell, touch, taste, thermoception (heat-sense), and the ability to know which way is down.
Constructional apraxia cannot be localized to a specific hemisphere or cerebral area because drawing and constructional tasks require both perceptual and motor functioning. [ 7 ] [ 9 ] It has been linked to parietal lesions in the left and right hemisphere, stroke and Alzheimer's disease.
Saccadic masking, also known as (visual) saccadic suppression, is the phenomenon in visual perception where the brain selectively blocks visual processing during eye movements in such a way that neither the motion of the eye (and subsequent motion blur of the image) nor the gap in visual perception is noticeable to the viewer.
Visual agnosia is an impairment in recognition of visually presented objects. It is not due to a deficit in vision (acuity, visual field, and scanning), language, memory, or intellect. [1]
Perceptual adaptation is a phenomenon that occurs for all of the senses, including smell and touch. An individual can adapt to a certain smell with time. Smokers, or individuals living with smokers, tend to stop noticing the smell of cigarettes after some time, whereas people not exposed to smoke on a regular basis will notice the smell instantly.
The Ganzfeld effect (from German for "complete field"), or perceptual deprivation, is a phenomenon of perception caused by exposure to an unstructured, uniform stimulation field. [1] The effect is the result of the brain amplifying neural noise in order to look for the missing visual signals.
Such perceptual abnormalities may also extend to the senses of hearing, taste, and smell. An important differentiation between hallucination and derealization is that an individual does not hear, see, or experience things that are not real or visible during derealization, rather, one experiences their immediate surroundings as distant or dreamlike.
Ocular parallax is a perceptual effect where the rotation of the eye causes perspective-dependent image shifts. This happens because the optical center and the rotation center of the eye are not the same. [23] Ocular parallax does not require head movement. It is separate and distinct from motion parallax.