It is customary to consider sound as being the province of auditory perception alone. However, recent findings and theory have emphasized the interactive nature of the sensory modalities as well as the ways in which sensory processing underlies higher cognition. For example, multisensory processing, in which multiple senses (vision, audition, touch) are used in concert, is beginning to be regarded as the norm, not the exception to perception. Furthermore, “embodied cognition” theories, that stress the close coupling of brain, body, and sensory systems, emphasize the importance of understanding how the dynamics of modality-specific constraints affect higher level cognition such as learning and memory. To put it another way: because the brain is an integrated functional system, sensory processing (and, by extension, the effects of sensory deprivation) are not completely independent from the rest of neurocognition and thus may have secondary effects on the brain and cognition as a whole.
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Social Development means development of the Society . Society can be developed by spreading the knowledge in the Society . Knowledge can be spread among the people of the society by means of papers and media programs .Those people who are not educated cannot read papers and can understand the programs through multimedia like television , so the best way to develop the society is making the use of sound . By making use of sound we can communicate with the people of the society and understand their demands and we can discuss with them the various things for the development of the society.By making the use of sound we can talk about the advantages of the education and also we can suggest them certain plans which will lead to the development of the society.  In Short , we can say that the sound is the primary means of the Social development without it actual development of the society is not possible at all . 
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