Accurate Reaching after Active But Not Passive Movements of the Hand: Evidence for Forward Modeling
Converging behavioral findings support recent models of motor control suggesting that estimates of the future positions of a limb as well as the expected sensory consequences of a planned movement may be derived, in part, from efference copies of motor commands. These estimates are referred to as fo...
Saved in:
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2008-01-01
|
| Series: | Behavioural Neurology |
| Online Access: | http://dx.doi.org/10.1155/2008/972542 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832555131562885120 |
|---|---|
| author | H. Branch Coslett Laurel J. Buxbaum John Schwoebel |
| author_facet | H. Branch Coslett Laurel J. Buxbaum John Schwoebel |
| author_sort | H. Branch Coslett |
| collection | DOAJ |
| description | Converging behavioral findings support recent models of motor control suggesting that estimates of the future positions of a limb as well as the expected sensory consequences of a planned movement may be derived, in part, from efference copies of motor commands. These estimates are referred to as forward models. However, relatively little behavioral evidence has been obtained for proposed forward models that provide on-line estimates of current position. We report data from a patient (JD) who reached accurately to visualized targets with and without vision of her hand despite substantial proprioceptive loss. Additionally, we administered a double-start reaching test to examine the possibility that efference copy information could be used to estimate current limb position. JD reached accurately, without vision, to a final target after actively reaching to a landmark, but exhibited severely impaired reaching after passive movements to the landmark. This finding suggests that forward modeling of efference copy signals may provide relatively accurate estimates of current limb position for the purpose of motor planning. The possibility that such estimates may also contribute to the awareness of body position and to self-recognition is discussed. |
| format | Article |
| id | doaj-art-c61238046b464d5c80d8759c92525605 |
| institution | Kabale University |
| issn | 0953-4180 1875-8584 |
| language | English |
| publishDate | 2008-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Behavioural Neurology |
| spelling | doaj-art-c61238046b464d5c80d8759c925256052025-02-03T05:49:33ZengWileyBehavioural Neurology0953-41801875-85842008-01-0119311712510.1155/2008/972542Accurate Reaching after Active But Not Passive Movements of the Hand: Evidence for Forward ModelingH. Branch Coslett0Laurel J. Buxbaum1John Schwoebel2University of Pennsylvania, Philadelphia, PA, USAMoss Rehabilitation Research Institute, Philadelphia, PA, USACazenovia College, Cazenovia, NY, USAConverging behavioral findings support recent models of motor control suggesting that estimates of the future positions of a limb as well as the expected sensory consequences of a planned movement may be derived, in part, from efference copies of motor commands. These estimates are referred to as forward models. However, relatively little behavioral evidence has been obtained for proposed forward models that provide on-line estimates of current position. We report data from a patient (JD) who reached accurately to visualized targets with and without vision of her hand despite substantial proprioceptive loss. Additionally, we administered a double-start reaching test to examine the possibility that efference copy information could be used to estimate current limb position. JD reached accurately, without vision, to a final target after actively reaching to a landmark, but exhibited severely impaired reaching after passive movements to the landmark. This finding suggests that forward modeling of efference copy signals may provide relatively accurate estimates of current limb position for the purpose of motor planning. The possibility that such estimates may also contribute to the awareness of body position and to self-recognition is discussed.http://dx.doi.org/10.1155/2008/972542 |
| spellingShingle | H. Branch Coslett Laurel J. Buxbaum John Schwoebel Accurate Reaching after Active But Not Passive Movements of the Hand: Evidence for Forward Modeling Behavioural Neurology |
| title | Accurate Reaching after Active But Not Passive Movements of the Hand: Evidence for Forward Modeling |
| title_full | Accurate Reaching after Active But Not Passive Movements of the Hand: Evidence for Forward Modeling |
| title_fullStr | Accurate Reaching after Active But Not Passive Movements of the Hand: Evidence for Forward Modeling |
| title_full_unstemmed | Accurate Reaching after Active But Not Passive Movements of the Hand: Evidence for Forward Modeling |
| title_short | Accurate Reaching after Active But Not Passive Movements of the Hand: Evidence for Forward Modeling |
| title_sort | accurate reaching after active but not passive movements of the hand evidence for forward modeling |
| url | http://dx.doi.org/10.1155/2008/972542 |
| work_keys_str_mv | AT hbranchcoslett accuratereachingafteractivebutnotpassivemovementsofthehandevidenceforforwardmodeling AT laureljbuxbaum accuratereachingafteractivebutnotpassivemovementsofthehandevidenceforforwardmodeling AT johnschwoebel accuratereachingafteractivebutnotpassivemovementsofthehandevidenceforforwardmodeling |