![]() The condensation disks sustain 2D spatial patterns of phase and amplitude of carrier waves in the beta and gamma EEG. The sensory-driven action potentials condense into mesoscopic wave packets like molecules forming raindrops from vapor. They form when sensory input destabilizes the primary receiving areas by local state transitions. Mesoscopic activity bridges the gap by the formation of wave packets. Macroscopic activity of the whole forebrain expressed by behavior is perceptual. Microscopic activity expressed by action potentials is sensory. Three levels of brain function are hypothesized to mediate transition from sensation and perception. The driven activity induces hemisphere-wide, self-organized patterns of neural activity called wave packets. Stimulus-activated receptors drive cortical neurons directly (olfactory) or indirectly through thalamocortical relays. Sensing and perceiving involve enormous numbers of widely distributed dendritic and action potentials in cortex, before, during and after stimulus arrival but with differing spatiotemporal patterns.
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