About 90% of humans are right-handed. Thus, for these individuals, the left cerebral hemisphere is said to be dominant over the right cerebral hemisphere.
For 96% of humans, the speech center is located in the left cerebral hemisphere.
Thus, an injury to the left cerebral hemisphere is generally more serious than an injury to the right cerebral hemisphere.
Memory is that faculty which enables an individual to store and retrieve factual items (sensations, impressions, facts, and ideas).
Memory is ultimately the result of the unceasing flow of sensory information into the CNS.
These items are stored in the CNS; just exactly how and where is the subject of much research and
All sensory inputs are collated against these stored items in order to arrive at an appropriate action decision. (Often, no action is the most appropriate decision.)
Two Types of Memory
At present, at least two types of memory are recognized in the human brain
• short-term memory
• long-term memory
A common example of short-term memory is the ability to hold a phone number in mind for a number of seconds without "memorizing" it.
Short-term memory is usually limited to about seven bits of information.
A portion of the cerebral cortex known as the hippocampus is thought to be important in transferring information from short-term memory to long-term memory.
If the hippocampus is nonfunctional, the individual can learn nothing, but his previously long-term memory remains intact.
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