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Preksha Dhyana :
temporal lobe which interprets auditory information. Hidden inside the temporal lobe is the area concerned with taste and smell.
The pre-frontal region which lies in front of the motor area is very well-developed in man. It has no primary sensory or motor functions, but is connected with other cortical regions and with some of the deeper structures of the brain. It is involved in the control of emotions and the storage of information, and it is the part of the brain concerned, above all, with personality and intellect.
A general picture of the abilities of the two hemispheres has been developed by various experimental studies. The left brain reads, writes and speaks fluently and does diffcult arithmetic. The right half seems rather stupid in comparison for verbal capabilities, but has a keener sense of shape, form etc. as well as a flair for musical rhythm and melody. Specialization of two halves is not an inherent difference in capacity, for if one side is damaged, the other one can be retrained to take over all functions. Dominance of one half over the other is responsible for "handedness”.
Memory is of two types-'temporary' and 'long-term' memory. Each memory is stored in redundant fashion on many different parts of the brain and is multiplyingly repeated. The storage and retrieval of memories seem to involve both electrical and chemical phenomena including the formation of engram (memory trace). Each of the neurons in a particular engram may be interconnected with numerous other memory traces, and from these interconnections the brain builds up its intricate “filing system".
Thalamus and Hypothalamus. At the base of the cerebral hemispheres, buried deep within the brain, are important structures, including the thalamus and the hypothalamus.
Thalamus is situated near the midline. It is a pair of egg-shaped masses of grey matter. It is predominantly a sensory relay station with incoming fibres from the spinal 1. Memory trace engram is fixation of a particular pattern of firing
neurobs.
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