spatial summation

(noun)

the effect when simultaneous impulses received at different places on the neuron add up to fire the neuron

Related Terms

  • axon hillock
  • temporal summation

Examples of spatial summation in the following topics:

  • Signal Summation

    • Signal summation occurs when impulses add together to reach the threshold of excitation to fire a neuron.
    • Summation, either spatial or temporal, is the addition of these impulses at the axon hillock .
    • Together, synaptic summation and the threshold for excitation act as a filter so that random "noise" in the system is not transmitted as important information.
    • Spatial summation means that the effects of impulses received at different places on the neuron add up so that the neuron may fire when such impulses are received simultaneously, even if each impulse on its own would not be sufficient to cause firing.
    • Temporal summation means that the effects of impulses received at the same place can add up if the impulses are received in close temporal succession.
  • Species Distribution

    • Scientists gain insight into a species' biology and ecology from studying spatial distribution of individuals.
    • Scientists gain additional insight into a species' biology and ecology from studying how individuals are spatially distributed.
    • Dispersion or distribution patterns show the spatial relationship between members of a population within a habitat.
  • Gene Expression for Spatial Positioning

    • A spatial pattern of gene expression reorganizes the mesoderm into groups of cells called somites with spaces between them.
    • Describe the role genes play in development and ensuring proper spatial positioning
  • Reception

    • Vestibular sensation, which is an organism's sense of spatial orientation and balance, proprioception (position of bones, joints, and muscles), and the sense of limb position that is used to track kinesthesia (limb movement) are part of somatosensation.
  • Cleavage, the Blastula Stage, and Gastrulation

    • The cells in the blastula rearrange themselves spatially to form three layers of cells in a process known as gastrulation.
  • Organogenesis

    • A spatial pattern of gene expression reorganizes the mesoderm into groups of cells called somites, with spaces between them.
  • Integration of Signals from Mechanoreceptors

    • However, the neurons are able to discriminate fine detail due to patterns of excitation and inhibition relative to the field, which leads to spatial resolution.
  • CAM and C4 Photosynthesis

    • C4 plants, in contrast, concentrate CO2 spatially, with a RuBisCO reaction centre in a "bundle sheath cell" that is inundated with CO2.
  • The Vestibular System

    • The fluid-filled semicircular canals are tubular loops set at oblique angles, arranged in three spatial planes.
  • Electron Orbitals

    • Although useful to explain the reactivity and chemical bonding of certain elements, the Bohr model of the atom does not accurately reflect how electrons are spatially distributed surrounding the nucleus.
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