Perception in psychiatry can be defined as the analysis of sensory information within the brain, integration within the brain with or without effect of prior knowledge and to give response to surroundings. As we go through our day, we are surrounded by the rich stimuli of modern life and we rely heavily on our sight to inform us of where we are placed within this world. Various theory’s have been proposed to explain, what is perception. Perception results from complex interactions among sensory and cognitive processes across hierarchical levels in the brain. It is mandatory to understand brain, its structure, what is CNS and basically what is mean by perception. Central nervous system and its response is more important in case of perception. Alteration in stimuli or response results in abnormal perception, maybe in visual, odour, haptic, tactile etc. Main cause is unknown still but abnormal perception observed in various diseases like Schizophrenia, Parkinson’s diseases, amblyopia, Hallucination, delusion, mania, Psychosis, Autism spectrum disorder (ASD) etc. Various cure are available that could not completey cure the disease but reduces the symptoms.
