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On the basis of studies finding heart rate deceleration among severely violent (SV) batterers (JM Gottman et al., 1995) and unsuccessful psychopaths (SS Ishikawa, A. Raine, T. Lencz, S. Bihrle, & L. Lacasse, 2001), this study compares the physiological reactivity of SV batterers (n= 35) with low-level violent (LLV) batterers (n= 37) and nonviolent men (n= 21) during 2 laboratory tasks. Men's heart rate and skin conductance level were recorded during baseline, a conflict discussion, and a standardized anger induction. Results suggest that autonomic hyporeactivity is a risk marker for antisocial features among SV men, whereas autonomic hyperreactivity is a risk marker among LLV men. Psychophysiological responding appears to be a stronger correlate of general antisocial behavior than of intimate partner abuse.(PsycInfo Database Record (c) 2022 APA, all rights reserved)