Potential wave mechanisms in cat cortex

摘要: Abstract Evidence is presented for two types of potential-wave responses apical dendrites cortex. The shorter-latency these decreases when its afferents are stimulated at 6 per sec. or faster, and the longer-latency process increases in amplitude. incremental sequences include classical recruiting waves following thalamic stimulation, similar from cortex to stimulation other regions cortex, stimulating locally lead position. Four groups size ranges fibers activating can be differentiated. largest those afferent radiations sensory primary projection areas. next smaller activate somewhat association area stimulated. A third group division activates decremental short-latency fourth waves. From conduction time, latter inferred consist unmyelinated fibers. property appears a function excitability cycle one type dendritic synapse, which shows periods facilitation. After first stimulus, second effective during 15 msec. duration response first, after period depression relative refractoriness follows. At sixth tenth this passes over into supernormal excitability. That is, repetition an initial stimulus causes increased phase. Spontaneously arising spindles nembutalized decerebrate preparations show close resemblances trains, interaction indicates that they may occur same elements. In fact what apparently spontaneous spindle appear repetitive if frequency less than discharge. This phenomenon seems related “doubling” each finally paroxysmal afterdischarge. Certain relations between waves, different loci but recorded leads across indicate initiated synapses via paths fiber types, impinging on dendrites. Inferences seem reasonable will account alpha rhythm as processes elements, activated patterns.