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Är hjärnhalvorna selektivt specialiserade på positiva och negativa emotioner? En visuell halvfältsstudie

Sjöberg, Klas and Tunander, Anders (2004)
Department of Psychology
Abstract
Thirty right-handed participants were presented with emotional pictures either to the left or to the right visual field. The pictures were shown for a duration of 150 ms to make sure that they were exclusively presented to one hemisphere only. Eye movements were recorded with electroocularogram for each participant throughout the test. A total of 30 pictures were chosen on the basis of their valence and categorised into three groups, negative, neutral and positive. Participants were asked to rate the pictures on a scale from one, beeing the most negative to nine, beeing the most positive. A repeated measures ANOVA revealed a difference between how the pictures were rated depending on which hemisphere recieved the stimuli. Pictures... (More)
Thirty right-handed participants were presented with emotional pictures either to the left or to the right visual field. The pictures were shown for a duration of 150 ms to make sure that they were exclusively presented to one hemisphere only. Eye movements were recorded with electroocularogram for each participant throughout the test. A total of 30 pictures were chosen on the basis of their valence and categorised into three groups, negative, neutral and positive. Participants were asked to rate the pictures on a scale from one, beeing the most negative to nine, beeing the most positive. A repeated measures ANOVA revealed a difference between how the pictures were rated depending on which hemisphere recieved the stimuli. Pictures presented to the left hemisphere were rated as more positive than when presented to the right. A closer analysis showed that this result was not consistent through the three valence groups. An interaction effect showed that the negative and neutral pictures were rated as more positive when presented to the left hemisphere, this bias was not found for the positive pictures. Hence the difference in rating could only be attributed to the negative and neutral pictures. The data suggests that the right and left hemispheres are differentially involved in the processing of emotion, at least for negative and neutral pictures. Keywords: Laterality, emotion, brain assymetry, IAPS (Less)
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author
Sjöberg, Klas and Tunander, Anders
supervisor
organization
year
type
M2 - Bachelor Degree
subject
keywords
Psychology, Psykologi
language
Swedish
id
1356341
date added to LUP
2004-11-08
date last changed
2004-11-08
@misc{1356341,
  abstract     = {Thirty right-handed participants were presented with emotional pictures either to the left or to the right visual field. The pictures were shown for a duration of 150 ms to make sure that they were exclusively presented to one hemisphere only. Eye movements were recorded with electroocularogram for each participant throughout the test. A total of 30 pictures were chosen on the basis of their valence and categorised into three groups, negative, neutral and positive. Participants were asked to rate the pictures on a scale from one, beeing the most negative to nine, beeing the most positive. A repeated measures ANOVA revealed a difference between how the pictures were rated depending on which hemisphere recieved the stimuli. Pictures presented to the left hemisphere were rated as more positive than when presented to the right. A closer analysis showed that this result was not consistent through the three valence groups. An interaction effect showed that the negative and neutral pictures were rated as more positive when presented to the left hemisphere, this bias was not found for the positive pictures. Hence the difference in rating could only be attributed to the negative and neutral pictures. The data suggests that the right and left hemispheres are differentially involved in the processing of emotion, at least for negative and neutral pictures. Keywords: Laterality, emotion, brain assymetry, IAPS},
  author       = {Sjöberg, Klas and Tunander, Anders},
  keyword      = {Psychology,Psykologi},
  language     = {swe},
  note         = {Student Paper},
  title        = {Är hjärnhalvorna selektivt specialiserade på positiva och negativa emotioner? En visuell halvfältsstudie},
  year         = {2004},
}