Cargando…
Response of the multiple-demand network during simple stimulus discriminations
The multiple-demand (MD) network is sensitive to many aspects of task difficulty, including such factors as rule complexity, memory load, attentional switching and inhibition. Many accounts link MD activity to top-down task control, raising the question of response when performance is limited by the...
Autores principales: | , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Academic Press
2018
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6019735/ https://www.ncbi.nlm.nih.gov/pubmed/29753108 http://dx.doi.org/10.1016/j.neuroimage.2018.05.019 |
_version_ | 1783335173457182720 |
---|---|
author | Wen, Tanya Mitchell, Daniel J. Duncan, John |
author_facet | Wen, Tanya Mitchell, Daniel J. Duncan, John |
author_sort | Wen, Tanya |
collection | PubMed |
description | The multiple-demand (MD) network is sensitive to many aspects of task difficulty, including such factors as rule complexity, memory load, attentional switching and inhibition. Many accounts link MD activity to top-down task control, raising the question of response when performance is limited by the quality of sensory input, and indeed, some prior results suggest little effect of sensory manipulations. Here we examined judgments of motion direction, manipulating difficulty by either motion coherence or salience of irrelevant dots. We manipulated each difficulty type across six levels, from very easy to very hard, and additionally manipulated whether difficulty level was blocked, and thus known in advance, or randomized. Despite the very large manipulations employed, difficulty had little effect on MD activity, especially for the coherence manipulation. Contrasting with these small or absent effects, we observed the usual increase of MD activity with increased rule complexity. We suggest that, for simple sensory discriminations, it may be impossible to compensate for reduced stimulus information by increased top-down control. |
format | Online Article Text |
id | pubmed-6019735 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | Academic Press |
record_format | MEDLINE/PubMed |
spelling | pubmed-60197352018-08-15 Response of the multiple-demand network during simple stimulus discriminations Wen, Tanya Mitchell, Daniel J. Duncan, John Neuroimage Article The multiple-demand (MD) network is sensitive to many aspects of task difficulty, including such factors as rule complexity, memory load, attentional switching and inhibition. Many accounts link MD activity to top-down task control, raising the question of response when performance is limited by the quality of sensory input, and indeed, some prior results suggest little effect of sensory manipulations. Here we examined judgments of motion direction, manipulating difficulty by either motion coherence or salience of irrelevant dots. We manipulated each difficulty type across six levels, from very easy to very hard, and additionally manipulated whether difficulty level was blocked, and thus known in advance, or randomized. Despite the very large manipulations employed, difficulty had little effect on MD activity, especially for the coherence manipulation. Contrasting with these small or absent effects, we observed the usual increase of MD activity with increased rule complexity. We suggest that, for simple sensory discriminations, it may be impossible to compensate for reduced stimulus information by increased top-down control. Academic Press 2018-08-15 /pmc/articles/PMC6019735/ /pubmed/29753108 http://dx.doi.org/10.1016/j.neuroimage.2018.05.019 Text en © 2018 The Authors http://creativecommons.org/licenses/by/4.0/ This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Wen, Tanya Mitchell, Daniel J. Duncan, John Response of the multiple-demand network during simple stimulus discriminations |
title | Response of the multiple-demand network during simple stimulus discriminations |
title_full | Response of the multiple-demand network during simple stimulus discriminations |
title_fullStr | Response of the multiple-demand network during simple stimulus discriminations |
title_full_unstemmed | Response of the multiple-demand network during simple stimulus discriminations |
title_short | Response of the multiple-demand network during simple stimulus discriminations |
title_sort | response of the multiple-demand network during simple stimulus discriminations |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6019735/ https://www.ncbi.nlm.nih.gov/pubmed/29753108 http://dx.doi.org/10.1016/j.neuroimage.2018.05.019 |
work_keys_str_mv | AT wentanya responseofthemultipledemandnetworkduringsimplestimulusdiscriminations AT mitchelldanielj responseofthemultipledemandnetworkduringsimplestimulusdiscriminations AT duncanjohn responseofthemultipledemandnetworkduringsimplestimulusdiscriminations |