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In human eye: Spatial summation
In spatial summation, two stimuli falling on nearby areas of the retina add their effects; though either alone may be inadequate to evoke the sensation of light, they may do so when presented simultaneously. Thus, the threshold luminance of a test patch required…
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type of summation

In summation
…several conducting fibres is called spatial summation.
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summation

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summation

physiology

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Related Topics:: neuromuscular junction; Bunsen-Roscoe law; spatial summation; temporal summation; Ricco’s law

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summation, in physiology, the additive effect of several electrical impulses on a neuromuscular junction, the junction between a nerve cell and a muscle cell. Individually the stimuli cannot evoke a response, but collectively they can generate a response. Successive stimuli on one nerve are called temporal summation; the addition of simultaneous stimuli from several conducting fibres is called spatial summation.

spatial summation

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type of summation

summation