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- Title
Hemispheric Asymmetry and Human Classical Conditioning to Verbal and Non-Verbal Visual CSs.
- Authors
Hugdahl, Kenneth; Kvale, Gerd; Nordby, Helge; Overmier, J. Bruce
- Abstract
A new paradigm called "the dichoptic acquisition paradigm" was developed to study the effects of hemispheric asymmetry on classical electrodermal conditioning. The paradigm Involves three phases: 1) A habituation phase where two different color-words written in two incongruent colors are tachistoscopically displayed bilaterally to the visual half-fields left and right of center fixation; 2) An acquisition phase, wherein the display is followed by a 105dB while noise on each trial; and 3) An extinction phase, where each of the four CS cues (two color-words and two colors) are separately presented bilaterally for simultaneous input to both hemispheres. Here the color-words are now presented in grey against a black background, and the colors as color-bars against the same background. A control group had no UCS presentations. Bilateral skin conductance responses (SCRs) of right-handed males were used to evaluate conditioning. Conditioning to the CS color- word previously presented in the right half-field (i.e. initial left-hemisphere input) during acquisition led to larger SCRs during extinction, than the color-word previously presented in the left half-field (i.e. initial right-hemisphere input). In contrast, the CS color cue previously presented in the left half-field during acquisition resulted in larger SCRs during the first extinction trial, than the CS color cue previously presented In the right half-field. Thus, the present experiment revealed effects of hemispheric asymmetry on human electrodermal conditioning.
- Subjects
GALVANIC skin response; ASYMMETRIC synthesis; COLOR; GRAY; BLACK; SCIENTIFIC experimentation
- Publication
Psychophysiology, 1987, Vol 24, Issue 5, p557
- ISSN
0048-5772
- Publication type
Article
- DOI
10.1111/j.1469-8986.1987.tb00337.x