Physiological Psychology by Thomas Brown (Auth.)
By Thomas Brown (Auth.)
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The saga of intercourse adjustments in mind and behaviour starts off with a tiny sperm swimming towards a big egg, to give a contribution its tiny Y chromosome plus its copies of the opposite chromosomes. Genetic, anatomic and physiologic changes within the male happen, making his mind and behaviour diversified in particular respects from his sister.
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Additional info for Physiological Psychology
The synaptic terminal of the postsynaptic cell might now only release half as much neurotransmitter as it would have if it had not been inhibited by this axo-axonic contact. This phenomenon is called presynaptic inhibition, because it tends to inhibit the amount of neurotransmitter which is released in response to an action potential in the postsynaptic cell's terminal. Presynaptic inhibition differs from postsynaptic inhibition in that the former occurs because of the result of excitatory neurotransmitter Axon affecting the cell just before its synaptic terminal.
This kind of integration is called spatial summation. Spatial summation also means that two depolarizing inputs, each of which is too small to trigger an action potential at the hillock, can sum together to reach threshold. Normally, since many neurons are providing input to the neuron which is doing the integrating, the axon hillock is spatially summating quite a number of inputs. Whenever the spatial summation of all the inputs which reach the axon hillock at the same time produces a depolarization which reaches the axon's threshold, the axon hillock will fire off an action potential.
Re-uptake. Instead of being inactivated by enzymes on the postsynaptic membrane, some neurotransmitters are taken back up directly into the synaptic terminal. 5 time in which to affect the postsynaptic membrane. Synapses which Ionic movements during an IPSP. synaptic transmission 35 use the neurotransmitter norepinephrine, for example, use this reuptake mechanism to terminate the effects of the neurotransmitter on the next cell. alternative kinds of The process of synaptic transmission which we have been discussing communication applies mainly to axo—dendritic and axo-somatic contacts.