Abstract
Summary
Medullary unit activity was recorded during application of a periodic pressure waveform to the carotid sinus of the cat. Poststimulus time histograms revealed twice as many cells showing increased activity to the pressure rise as those showing a decrease. Many cells showed surprisingly long latencies (up to 90° phase shift). In addition, two (of 33) cells increased activity through a pressure range independent of the direction of change. Cells were often found in the region between the paramedian reticular nucleus and the nucleus ambiguus as well as in the vicinity of tractus solitarius.
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