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Tactile-to-Visual Cross-Modal Transfer of Texture Categorisation Following Training: An fMRI Study

We investigated the neural underpinnings of texture categorisation using exemplars that were previously learned either within modalities (visual training and visual test) or across modalities (tactile training and visual test). Previous models of learning suggest a decrease in activation in brain re...

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Autores principales: O’Callaghan, Georgia, O’Dowd, Alan, Simões-Franklin, Cristina, Stapleton, John, Newell, Fiona N.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Frontiers Media S.A. 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6001281/
https://www.ncbi.nlm.nih.gov/pubmed/29946245
http://dx.doi.org/10.3389/fnint.2018.00024
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author O’Callaghan, Georgia
O’Dowd, Alan
Simões-Franklin, Cristina
Stapleton, John
Newell, Fiona N.
author_facet O’Callaghan, Georgia
O’Dowd, Alan
Simões-Franklin, Cristina
Stapleton, John
Newell, Fiona N.
author_sort O’Callaghan, Georgia
collection PubMed
description We investigated the neural underpinnings of texture categorisation using exemplars that were previously learned either within modalities (visual training and visual test) or across modalities (tactile training and visual test). Previous models of learning suggest a decrease in activation in brain regions that are typically involved in cognitive control during task acquisition, but a concomitant increase in activation in brain regions associated with the representation of the acquired information. In our study, participants were required to learn to categorise fabrics of different textures as either natural or synthetic. Training occurred over several sessions, with each fabric presented either visually or through touch to a participant. Pre- and post-training tests, in which participants categorised visual images only of the fabrics, were conducted during a functional magnetic resonance imaging (fMRI) scan. Consistent with previous research on cognitive processes involved in task acquisition, we found that categorisation training was associated with a decrease in activation in brain regions associated with cognitive systems involved in learning, including the superior parietal cortex, dorsal anterior cingulate cortex (dACC), and the right dorsolateral prefrontal cortex (DLFC). Moreover, these decreases were independent of training modality. In contrast, we found greater activation to visual textures in a region within the left medial occipital cortex (MOC) following training. There was no overall evidence of an effect of training modality in the main analyses, with texture-specific regional changes associated with both within- (visual) and cross- (touch) modal training. However, further analyses suggested that, unlike categorisation performance following within-modal training, crossmodal training was associated with bilateral activation of the MOC. Our results support previous evidence for a multisensory representation of texture within early visual regions of the cortex and provide insight into how multisensory categories are formed in the brain.
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spelling pubmed-60012812018-06-26 Tactile-to-Visual Cross-Modal Transfer of Texture Categorisation Following Training: An fMRI Study O’Callaghan, Georgia O’Dowd, Alan Simões-Franklin, Cristina Stapleton, John Newell, Fiona N. Front Integr Neurosci Neuroscience We investigated the neural underpinnings of texture categorisation using exemplars that were previously learned either within modalities (visual training and visual test) or across modalities (tactile training and visual test). Previous models of learning suggest a decrease in activation in brain regions that are typically involved in cognitive control during task acquisition, but a concomitant increase in activation in brain regions associated with the representation of the acquired information. In our study, participants were required to learn to categorise fabrics of different textures as either natural or synthetic. Training occurred over several sessions, with each fabric presented either visually or through touch to a participant. Pre- and post-training tests, in which participants categorised visual images only of the fabrics, were conducted during a functional magnetic resonance imaging (fMRI) scan. Consistent with previous research on cognitive processes involved in task acquisition, we found that categorisation training was associated with a decrease in activation in brain regions associated with cognitive systems involved in learning, including the superior parietal cortex, dorsal anterior cingulate cortex (dACC), and the right dorsolateral prefrontal cortex (DLFC). Moreover, these decreases were independent of training modality. In contrast, we found greater activation to visual textures in a region within the left medial occipital cortex (MOC) following training. There was no overall evidence of an effect of training modality in the main analyses, with texture-specific regional changes associated with both within- (visual) and cross- (touch) modal training. However, further analyses suggested that, unlike categorisation performance following within-modal training, crossmodal training was associated with bilateral activation of the MOC. Our results support previous evidence for a multisensory representation of texture within early visual regions of the cortex and provide insight into how multisensory categories are formed in the brain. Frontiers Media S.A. 2018-06-07 /pmc/articles/PMC6001281/ /pubmed/29946245 http://dx.doi.org/10.3389/fnint.2018.00024 Text en Copyright © 2018 O’Callaghan, O’Dowd, Simões-Franklin, Stapleton and Newell. http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
spellingShingle Neuroscience
O’Callaghan, Georgia
O’Dowd, Alan
Simões-Franklin, Cristina
Stapleton, John
Newell, Fiona N.
Tactile-to-Visual Cross-Modal Transfer of Texture Categorisation Following Training: An fMRI Study
title Tactile-to-Visual Cross-Modal Transfer of Texture Categorisation Following Training: An fMRI Study
title_full Tactile-to-Visual Cross-Modal Transfer of Texture Categorisation Following Training: An fMRI Study
title_fullStr Tactile-to-Visual Cross-Modal Transfer of Texture Categorisation Following Training: An fMRI Study
title_full_unstemmed Tactile-to-Visual Cross-Modal Transfer of Texture Categorisation Following Training: An fMRI Study
title_short Tactile-to-Visual Cross-Modal Transfer of Texture Categorisation Following Training: An fMRI Study
title_sort tactile-to-visual cross-modal transfer of texture categorisation following training: an fmri study
topic Neuroscience
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6001281/
https://www.ncbi.nlm.nih.gov/pubmed/29946245
http://dx.doi.org/10.3389/fnint.2018.00024
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