summation

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sum·ma·tion

(sŭm-ā'shŭn),
The aggregation of a number of similar neural impulses or stimuli.
[Mediev. L. summatio, fr. summo, pp. -atus, to sum up, fr. L. summa, sum]

summation

(sə-mā′shən)
n.
1. The act or process of adding; addition.
2. A sum or aggregate.
3. A concluding argument after the presentation of a legal case, especially an argument made to a judge or jury by an attorney for a party as to why that party should prevail.
4. Physiology The process by which multiple or repeated stimuli can produce a response in a nerve, muscle, or other part that one stimulus alone cannot produce.

sum·ma·tion

(sŭ-mā'shŭn)
The aggregation of a number of similar neural impulses or stimuli.
[Mediev. L. summatio, fr. summo, pp. -atus, to sum up, fr. L. summa, sum]

summation

the production of an effect by the repetition of stimuli, any single one of which would be insufficient to produce an effect, as in muscular contraction where summation brings about TETANUS which results from a series of stimuli. See RODS and CONES CELLS for the effect of summation in the eye.

summation 

Increased effect produced by a series of stimuli applied either simultaneously or successively (provided the intervals are greater than the latent period). Binocular summation usually occurs when the two eyes are stimulated; thus binocular brightness is greater than monocular, except in the unusual Fechner's paradox. Two or more stimuli falling within the excitatory region of a receptive field will increase the excitatory response and similarly two or more stimuli falling within the inhibitory region of a receptive field will increase the inhibition: this is called spatial summation. The summation may also occur if successive stimulations are received by the same retinal region: this is called temporal summation. See complex cell; simple cell; receptive field; lateral inhibition.

sum·ma·tion

(sŭ-mā'shŭn)
Aggregation of several similar neural impulses or stimuli.
[Mediev. L. summatio, fr. summo, pp. -atus, to sum up, fr. L. summa, sum]
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