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A freezing-like posture to pictures of mutilation

Authors


  • Grants from federal and state Brazilian research agencies CNPq, PRONEX-MCT, FAPERJ, and CAPES-COFECUB funded this research. The authors thank Prof. Peter Lang for invaluable comments and suggestions.

Address reprint requests to: Eliane Volchan, Institute of Biophysics Carlos Chagas Filho, Federal University of Rio de Janeiro, Av. Brigadeiro Trompowski s/n, Ilha do Fundao, Rio de Janeiro, 21949-900, Brazil. E-mail: evolchan@biof.ufrj.br.

Abstract

Postural sway and heart rate were recorded in young men viewing emotionally engaging pictures. It was hypothesized that they would show a human analog of “freezing” behavior (i.e., immobility and heart rate deceleration) when confronted with a sustained block of unpleasant (mutilation) images, relative to their response to pleasant/arousing (sport action) or neutral (objects) pictures. Volunteers stood on a stabilometric platform during picture viewing. Significantly reduced body sway was recorded during the unpleasant pictures, along with increased mean power frequency (indexing muscle stiffness). Heart rate during unpleasant pictures also showed the expected greater deceleration. This pattern resembles the “freezing” and “fear bradycardia” seen in many species when confronted with threatening stimuli, mediated by neural circuits that promote defensive survival.

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