The role of the left and right inferior frontal gyrus in processing metaphoric and unrelated co-speech gestures
Gestures are an integral part of in-person conversations and complement the meaning of the speech they accompany. The neural processing of co-speech gestures is supported by a mostly left-lateralized network of fronto-temporal regions. However, in contrast to iconic gestures, metaphoric as well as u...
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doaj-de519d7ab8aa45d8ae3a677b5e896fde2021-07-03T04:44:22ZengElsevierNeuroImage1095-95722021-08-01237118182The role of the left and right inferior frontal gyrus in processing metaphoric and unrelated co-speech gesturesMiriam Steines0Arne Nagels1Tilo Kircher2Benjamin Straube3Department of Psychiatry and Psychotherapy, Philipps-Universität Marburg, Rudolf-Bultmann-Straße 8, Marburg 35039, Germany; Center for Mind, Brain and Behavior - CMBB, Hans-Meerwein-Straße 6, Marburg 35032, Germany; Corresponding author at: Department of Psychiatry and Psychotherapy, Philipps-Universität Marburg, Rudolf-Bultmann-Straße 8, Marburg 35039, Germany.Department of Psychiatry and Psychotherapy, Philipps-Universität Marburg, Rudolf-Bultmann-Straße 8, Marburg 35039, GermanyDepartment of Psychiatry and Psychotherapy, Philipps-Universität Marburg, Rudolf-Bultmann-Straße 8, Marburg 35039, Germany; Center for Mind, Brain and Behavior - CMBB, Hans-Meerwein-Straße 6, Marburg 35032, GermanyDepartment of Psychiatry and Psychotherapy, Philipps-Universität Marburg, Rudolf-Bultmann-Straße 8, Marburg 35039, Germany; Center for Mind, Brain and Behavior - CMBB, Hans-Meerwein-Straße 6, Marburg 35032, GermanyGestures are an integral part of in-person conversations and complement the meaning of the speech they accompany. The neural processing of co-speech gestures is supported by a mostly left-lateralized network of fronto-temporal regions. However, in contrast to iconic gestures, metaphoric as well as unrelated gestures have been found to more strongly engage the left and right inferior frontal gyrus (IFG), respectively. With this study, we conducted the first systematic comparison of all three types of gestures and resulting potential laterality effects.During collection of functional imaging data, 74 subjects were presented with 5 s videos of abstract speech with related metaphoric gestures, concrete speech with related iconic gestures and concrete speech with unrelated gestures. They were asked to judge whether the content of the speech and gesture matched or not.Differential contrasts revealed that both abstract related and concrete unrelated compared to concrete related stimuli elicited stronger activation of the bilateral IFG. Analyses of lateralization indices for IFG activation further showed a left hemispheric dominance for metaphoric gestures and a right hemispheric dominance for unrelated gestures.Our results give support to the hypothesis that the bilateral IFG is activated specifically when processing load for speech-gesture combinations is high. In addition, laterality effects indicate a stronger involvement of the right IFG in mismatch detection and conflict processing, whereas the left IFG performs the actual integration of information from speech and gesture.http://www.sciencedirect.com/science/article/pii/S1053811921004596Inferior frontal gyrusMetaphoric gesturesUnrelated gesturesLateralityfMRIIndividual differences |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Miriam Steines Arne Nagels Tilo Kircher Benjamin Straube |
spellingShingle |
Miriam Steines Arne Nagels Tilo Kircher Benjamin Straube The role of the left and right inferior frontal gyrus in processing metaphoric and unrelated co-speech gestures NeuroImage Inferior frontal gyrus Metaphoric gestures Unrelated gestures Laterality fMRI Individual differences |
author_facet |
Miriam Steines Arne Nagels Tilo Kircher Benjamin Straube |
author_sort |
Miriam Steines |
title |
The role of the left and right inferior frontal gyrus in processing metaphoric and unrelated co-speech gestures |
title_short |
The role of the left and right inferior frontal gyrus in processing metaphoric and unrelated co-speech gestures |
title_full |
The role of the left and right inferior frontal gyrus in processing metaphoric and unrelated co-speech gestures |
title_fullStr |
The role of the left and right inferior frontal gyrus in processing metaphoric and unrelated co-speech gestures |
title_full_unstemmed |
The role of the left and right inferior frontal gyrus in processing metaphoric and unrelated co-speech gestures |
title_sort |
role of the left and right inferior frontal gyrus in processing metaphoric and unrelated co-speech gestures |
publisher |
Elsevier |
series |
NeuroImage |
issn |
1095-9572 |
publishDate |
2021-08-01 |
description |
Gestures are an integral part of in-person conversations and complement the meaning of the speech they accompany. The neural processing of co-speech gestures is supported by a mostly left-lateralized network of fronto-temporal regions. However, in contrast to iconic gestures, metaphoric as well as unrelated gestures have been found to more strongly engage the left and right inferior frontal gyrus (IFG), respectively. With this study, we conducted the first systematic comparison of all three types of gestures and resulting potential laterality effects.During collection of functional imaging data, 74 subjects were presented with 5 s videos of abstract speech with related metaphoric gestures, concrete speech with related iconic gestures and concrete speech with unrelated gestures. They were asked to judge whether the content of the speech and gesture matched or not.Differential contrasts revealed that both abstract related and concrete unrelated compared to concrete related stimuli elicited stronger activation of the bilateral IFG. Analyses of lateralization indices for IFG activation further showed a left hemispheric dominance for metaphoric gestures and a right hemispheric dominance for unrelated gestures.Our results give support to the hypothesis that the bilateral IFG is activated specifically when processing load for speech-gesture combinations is high. In addition, laterality effects indicate a stronger involvement of the right IFG in mismatch detection and conflict processing, whereas the left IFG performs the actual integration of information from speech and gesture. |
topic |
Inferior frontal gyrus Metaphoric gestures Unrelated gestures Laterality fMRI Individual differences |
url |
http://www.sciencedirect.com/science/article/pii/S1053811921004596 |
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