title: Classical conditioning of human systolic pressure: replication and extension using three stimulus durations.
abstract: Recent efforts have demonstrated classical conditioning of human systolic pressure (De Leon, 1972). The present research attempted a replication with longer sessions and to maximize the CS+, CS- differentiation by varying CS+ durations. Student volunteers (N = 64) underwent four, 50 minute sessions, three conditioning and one extinction, distributed over two weeks. Shock (UCS) occurred intermittently in light-on (CS+) and never in light-off (CS-). Results closely replicated the earlier work, revealing a characteristic UCR, a significant CS+, CS- differential and, conditioned elevations failed to adapt within and across sessions. The pressure differential was inversely related to CS+ duration. Clarification of conditioning influences requires follow-up research on these clients outside of the laboratory. Nevertheless, these studies provide firm experimental evidence for implicating stimulus variables in the origins of certain hypertensive states.
mesh_terms: D000293:Adolescent; D000328:Adult; D001794:Blood Pressure; D003214:Conditioning, Classical; D004597:Electroshock; D005108:Extinction, Psychological; D005260:Female; D006801:Humans; D008297:Male; D013599:Systole