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Recordings of encephalographic electrical waves show, amid their jagged spikes and hieroglyph swirls, a signature downward dip signifying that a neur… - Thomas Lewis
" "Recordings of encephalographic electrical waves show, amid their jagged spikes and hieroglyph swirls, a signature downward dip signifying that a neuronal mandate for motion is under way: the so-called readiness wave. While the motor cortex produces motion, the readiness wave appears to signal intent. So we should look here for will. When experimenters placed their subjects in front of a clock, however, they found that the conscious experience of a decision to move occurs after the readiness wave has already passed. What we feel as the conscious spark of resolve in this case proves to be an afterthought, not the majestic nexus of initiative we might imagine. Just where and how the early glimmers of intention coalesce, like glittering dust motes into the swirling jinni of action, remains beyond the ken of today’s science. The more we discover, the more we find that we do not know.
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Recordings of encephalographic electrical waves show, amid their jagged spikes and hieroglyph swirls, a signature downward dip signifying that a neuronal mandate for motion is under way: the so-called readiness wave. While the motor cortex produces motion, the readiness wave appears to signal intent. So we should look here for will.
Additional quotes by Thomas Lewis
When trying to fathom an immense, intricate system, drawing direct arrows of causality between micro and macro-components is perilous. Which stock caused the crash of ’29? Which person triggered the outbreak of World War I? Which word of Poe’s “The Rave” suffuses it with an atmosphere of brooding melancholy?
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The scientific basis for separating neocortical from limbic brain matter rests on solid neuroanatomical, cellular, and empirical grounds. As viewed through the microscope, limbic areas exhibit a far more primitive cellular organization than their neocortical counterparts. Certain radiographic dyes selectively stain limbic structures, thus painting the molecular dissimilarity between the two brains in clean, vivid strokes. One researcher made an antibody that binds to cells of the hippocampus — a limbic component — and found that those same fluorescent markers stuck to all parts of the limbic brain, lighting it up like a biological Christmas tree, without coloring the neocortex at all. Large doses of some medications destroy limbic tissue while leaving the neocortex unscathed, a sharp-shooting feat enabled by evolutionary divergence in the chemical composition of limbic and neocortical cell membranes.
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