Abstract
The central nervous system (CNS) comprises some fifty billion neurons. From the simplest reflex to the most complex activity, all behavior depends on the special ability of these neurons to communicate with the environment, with other neurons within the nervous system, and with muscles and glands. Communication between neurons is accomplished by electrochemical depolarization at nerve cell membranes that travels along cell processes to trigger the release of chemical neurotransmitters at synaptic clefts. These transmitters drift across the synaptic cleft and attach to receptor sites on the postsynaptic membrane effecting one of two possible changes: depolarization which biases membrane potentials of receiving neurons so that action potentials are more likely to occur (excitation), or hyperpolarization which decreases the likelihood of cell firing (inhibition). At any time, the probability of action potentials depends on the temporal and spatial summation of these excitatory and inhibitory effects. Thus, all behavior is controlled by excitatory and inhibitory neuronal activity and reflects an ongoing and dynamic shifting of the predominance of the two effects [55]. The importance of inhibition within the CNS is eloquently described by McGeer et al. [49, pg 133].
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Dustman, R.E., Shearer, D.E., Emmerson, R.Y. (1991). Evoked Potentials and EEG Suggest CNS Inhibitory Deficits in Aging. In: Armstrong, D., Marmor, M.F., Ordy, J.M. (eds) The Effects of Aging and Environment on Vision. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-3758-8_13
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