3. Autonomic responding to aversive words without conscious valence
discrimination
Laetitia Silverta, Sylvain Delplanquea, Hammou Bouwalerh
Universit de Lille, France
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A growing body of data suggests that the emotional dimension of a
stimulus can be processed without conscious identification of the
stimulus. The arousal system could be activated by unrecognised
biologically significant stimuli through simple physical stimulus
features related to threat, without any evaluation of the meaning of the
stimulus. However, unconscious processing of emotionally laden words
cannot rely only on perceptual features but must include some analysis
of symbolic meaning. The first aim of the present study was to assess
whether masked (unrecognised) aversive words can elicit enhanced skin
conductance responses (SCRs), a major autonomic index of emotional
arousal, in normal participants. Our second aim was to determine whether
any autonomic activation related to affective value of words is
independent from access of this value to consciousness. Thus, the
presentation duration of masked aversive and neutral words was
determined, for each participant, in such a way that (1) identification
was precluded, (2) valence discrimination was at chance, as indicated by
performance in a forced-choice two-alternative task and by confidence
ratings of the responses, and (3) emotional and neutral words were not
detected differentially. SCRs were recorded during masked and unmasked
presentations of both types of word. SCRs elicited by unmasked words,
and also by masked words, were of greater magnitude when the words were
emotional than when they were neutral. Consequently, in normal
participants, autonomic activation can be a discriminative marker of the
affective dimension of unrecognised verbal material in the absence of
conscious valence identification.
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