Cargando…
Action Without Awareness: Reaching to an Object You Do Not Remember Seeing
BACKGROUND: Previous work by our group has shown that the scaling of reach trajectories to target size is independent of obligatory awareness of that target property and that “action without awareness” can persist for up to 2000 ms of visual delay. In the present investigation we sought to determine...
Autores principales: | , , , |
---|---|
Formato: | Texto |
Lenguaje: | English |
Publicado: |
Public Library of Science
2008
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2568811/ https://www.ncbi.nlm.nih.gov/pubmed/18953411 http://dx.doi.org/10.1371/journal.pone.0003539 |
_version_ | 1782160037491245056 |
---|---|
author | Heath, Matthew Maraj, Anika Godbolt, Bryan Binsted, Gordon |
author_facet | Heath, Matthew Maraj, Anika Godbolt, Bryan Binsted, Gordon |
author_sort | Heath, Matthew |
collection | PubMed |
description | BACKGROUND: Previous work by our group has shown that the scaling of reach trajectories to target size is independent of obligatory awareness of that target property and that “action without awareness” can persist for up to 2000 ms of visual delay. In the present investigation we sought to determine if the ability to scale reaching trajectories to target size following a delay is related to the pre-computing of movement parameters during initial stimulus presentation or the maintenance of a sensory (i.e., visual) representation for on-demand response parameterization. METHODOLOGY/PRINCIPAL FINDINGS: Participants completed immediate or delayed (i.e., 2000 ms) perceptual reports and reaching responses to different sized targets under non-masked and masked target conditions. For the reaching task, the limb associated with a trial (i.e., left or right) was not specified until the time of response cuing: a manipulation that prevented participants from pre-computing the effector-related parameters of their response. In terms of the immediate and delayed perceptual tasks, target size was accurately reported during non-masked trials; however, for masked trials only a chance level of accuracy was observed. For the immediate and delayed reaching tasks, movement time as well as other temporal kinematic measures (e.g., times to peak acceleration, velocity and deceleration) increased in relation to decreasing target size across non-masked and masked trials. CONCLUSIONS/SIGNIFICANCE: Our results demonstrate that speed-accuracy relations were observed regardless of whether participants were aware (i.e., non-masked trials) or unaware (i.e., masked trials) of target size. Moreover, the equivalent scaling of immediate and delayed reaches during masked trials indicates that a persistent sensory-based representation supports the unconscious and metrical scaling of memory-guided reaching. |
format | Text |
id | pubmed-2568811 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2008 |
publisher | Public Library of Science |
record_format | MEDLINE/PubMed |
spelling | pubmed-25688112008-10-27 Action Without Awareness: Reaching to an Object You Do Not Remember Seeing Heath, Matthew Maraj, Anika Godbolt, Bryan Binsted, Gordon PLoS One Research Article BACKGROUND: Previous work by our group has shown that the scaling of reach trajectories to target size is independent of obligatory awareness of that target property and that “action without awareness” can persist for up to 2000 ms of visual delay. In the present investigation we sought to determine if the ability to scale reaching trajectories to target size following a delay is related to the pre-computing of movement parameters during initial stimulus presentation or the maintenance of a sensory (i.e., visual) representation for on-demand response parameterization. METHODOLOGY/PRINCIPAL FINDINGS: Participants completed immediate or delayed (i.e., 2000 ms) perceptual reports and reaching responses to different sized targets under non-masked and masked target conditions. For the reaching task, the limb associated with a trial (i.e., left or right) was not specified until the time of response cuing: a manipulation that prevented participants from pre-computing the effector-related parameters of their response. In terms of the immediate and delayed perceptual tasks, target size was accurately reported during non-masked trials; however, for masked trials only a chance level of accuracy was observed. For the immediate and delayed reaching tasks, movement time as well as other temporal kinematic measures (e.g., times to peak acceleration, velocity and deceleration) increased in relation to decreasing target size across non-masked and masked trials. CONCLUSIONS/SIGNIFICANCE: Our results demonstrate that speed-accuracy relations were observed regardless of whether participants were aware (i.e., non-masked trials) or unaware (i.e., masked trials) of target size. Moreover, the equivalent scaling of immediate and delayed reaches during masked trials indicates that a persistent sensory-based representation supports the unconscious and metrical scaling of memory-guided reaching. Public Library of Science 2008-10-27 /pmc/articles/PMC2568811/ /pubmed/18953411 http://dx.doi.org/10.1371/journal.pone.0003539 Text en This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose. https://creativecommons.org/publicdomain/zero/1.0/ This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration, which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose. |
spellingShingle | Research Article Heath, Matthew Maraj, Anika Godbolt, Bryan Binsted, Gordon Action Without Awareness: Reaching to an Object You Do Not Remember Seeing |
title | Action Without Awareness: Reaching to an Object You Do Not Remember Seeing |
title_full | Action Without Awareness: Reaching to an Object You Do Not Remember Seeing |
title_fullStr | Action Without Awareness: Reaching to an Object You Do Not Remember Seeing |
title_full_unstemmed | Action Without Awareness: Reaching to an Object You Do Not Remember Seeing |
title_short | Action Without Awareness: Reaching to an Object You Do Not Remember Seeing |
title_sort | action without awareness: reaching to an object you do not remember seeing |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2568811/ https://www.ncbi.nlm.nih.gov/pubmed/18953411 http://dx.doi.org/10.1371/journal.pone.0003539 |
work_keys_str_mv | AT heathmatthew actionwithoutawarenessreachingtoanobjectyoudonotrememberseeing AT marajanika actionwithoutawarenessreachingtoanobjectyoudonotrememberseeing AT godboltbryan actionwithoutawarenessreachingtoanobjectyoudonotrememberseeing AT binstedgordon actionwithoutawarenessreachingtoanobjectyoudonotrememberseeing |