Plasticity of the cortical body map

Plasticity of the cortical body map - Plasticity of the...

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Plasticity of the cortical body map o In monkeys after prolonged stimulation, neurons that did not initially respond are now responding, expanding the cortical area in the brain that responds to the stimulus o In humans, after one year intensive training in braille reading there was an enlargement of cortical finger map o What is the functional significance of cortical enlargement? Measuring tactile acuity One point or two o Back has the highest threshold o Tip of the tongue has smallest threshold Grating vertical or horizontal o Receptor mechanism of tactile acuity Merkel – SA – likely involved in tactile acuity, increased firing when the stimulus is applied There is high density of Merkel receptor fibers in the fingertips The concept of receptive field – property of a cortical neuron o Receptive field is the area of the skin surface where some activity causes a change in that neuron o Excitatory center with and inhibitory surround o Receptor density is related to size of cortical receptive fields
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Plasticity of the cortical body map - Plasticity of the...

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