Z. Bergman

Z. Bergman was a researcher affiliated with the Hebrew University of Jerusalem during the 1960s, where he collaborated with prominent psychophysiologists Solomon Kugelmass and Israel Lieblich on pioneering studies of deception detection. While specific biographical details about Bergman remain limited in the historical record, his work emerged from one of the most active research programs in psychophysiological detection during this formative period of polygraph science.

Bergman's primary contribution to polygraph research was the 1967 study "The role of 'lying' in psychophysiological detection," published in Psychophysiology with Kugelmass and Lieblich. This influential study examined whether the act of lying itself was necessary for psychophysiological detection, demonstrating that differential physiological responses occurred whether examinees denied special knowledge about items or claimed special knowledge about all items. The work was cited in the National Research Council's landmark 2003 review of polygraph science as part of the evidence base for understanding arousal theory in deception detection—the concept that detection occurs because of differential arousal value of stimuli regardless of whether deception per se is involved.

The Hebrew University research group that included Bergman was notably productive during the mid-1960s, conducting laboratory studies on realistic stress, galvanic skin response (GSR), and the concealed information test paradigm. Their experimental work demonstrated that stress levels did not significantly impair detection efficiency, a finding that proved important for establishing the generalizability of laboratory polygraph research to real-world forensic settings. The team's research was supported by the U.S. Air Force Office of Scientific Research, reflecting the international military and security interest in improving lie detection methods during the Cold War era.