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Cardiac stimulus intensity and heartbeat detection: Effects of tilt‐induced changes in stroke volume
Author(s) -
RING CHRISTOPHER,
LIU XIAOQING,
BRENER JASPER
Publication year - 1994
Publication title -
psychophysiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.661
H-Index - 156
eISSN - 1469-8986
pISSN - 0048-5772
DOI - 10.1111/j.1469-8986.1994.tb02348.x
Subject(s) - heartbeat , psychology , stroke volume , stimulus (psychology) , stroke (engine) , tilt (camera) , cardiology , intensity (physics) , audiology , heart rate , neuroscience , medicine , cognitive psychology , blood pressure , optics , computer security , computer science , mechanical engineering , physics , engineering
The effects of variations in stroke volume on the intensity of cardiac stimuli was examined in a series of three experiments that empolyed classical psychophsical methods to assess heartbeat detection. Stroke volume was manipulated by passive body tilt and recorded using impedance cardiography while subjects performed heartbeat detection tasks. The postural manipulation generated little or no change in contractility or momentum but did produce substantial changes in stroke volume. However, this potential source of variation in cardiac stimulus magnitude did not influence either the precision of heartbeat detection or the temporal location of heartbeat sensations. It is concluded that the intensity dimension of the heartbeat stimulus is not determined by stroke volume.