Motivation dynamically increases noise resistance by internal feedback during movement
Motivation improves performance, pushing us beyond our normal limits. One general explanation for this is that the effects of neural noise can be reduced, at a cost. If this were possible, reward would promote investment in resisting noise. But how could the effects of noise be attenuated, and why s...
| Main Authors: | , , , |
|---|---|
| Format: | Journal article |
| Published: |
Elsevier
2018
|
| _version_ | 1797082768468869120 |
|---|---|
| author | Manohar, S Husain, M Muhammed, K Fallon, S |
| author_facet | Manohar, S Husain, M Muhammed, K Fallon, S |
| author_sort | Manohar, S |
| collection | OXFORD |
| description | Motivation improves performance, pushing us beyond our normal limits. One general explanation for this is that the effects of neural noise can be reduced, at a cost. If this were possible, reward would promote investment in resisting noise. But how could the effects of noise be attenuated, and why should this be costly? Negative feedback may be employed to compensate for disturbances in a neural representation. Such feedback would increase the robustness of neural representations to internal signal fluctuations, producing a stable attractor. We propose that encoding this negative feedback in neural signals would incur additional costs proportional to the strength of the feedback signal. We use eye movements to test the hypothesis that motivation by reward improves precision by increasing the strength of internal negative feedback. We find that reward simultaneously increases the amplitude, velocity and endpoint precision of saccades, indicating true improvement in oculomotor performance. Analysis of trajectories demonstrates that variation in the eye position during the course of saccades is predictive of the variation of endpoints, but this relation is reduced by reward. This indicates that motivation permits more aggressive correction 2 of errors during the saccade, so that they no longer affect the endpoint. We suggest that such increases in internal negative feedback allow attractor stability, albeit at a cost, and therefore may explain how motivation improves cognitive as well as motor precision. |
| first_indexed | 2024-03-07T01:32:30Z |
| format | Journal article |
| id | oxford-uuid:941449f0-c6d6-4875-a354-eb57019bbf63 |
| institution | University of Oxford |
| last_indexed | 2024-03-07T01:32:30Z |
| publishDate | 2018 |
| publisher | Elsevier |
| record_format | dspace |
| spelling | oxford-uuid:941449f0-c6d6-4875-a354-eb57019bbf632022-03-26T23:36:43ZMotivation dynamically increases noise resistance by internal feedback during movementJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:941449f0-c6d6-4875-a354-eb57019bbf63Symplectic Elements at OxfordElsevier2018Manohar, SHusain, MMuhammed, KFallon, SMotivation improves performance, pushing us beyond our normal limits. One general explanation for this is that the effects of neural noise can be reduced, at a cost. If this were possible, reward would promote investment in resisting noise. But how could the effects of noise be attenuated, and why should this be costly? Negative feedback may be employed to compensate for disturbances in a neural representation. Such feedback would increase the robustness of neural representations to internal signal fluctuations, producing a stable attractor. We propose that encoding this negative feedback in neural signals would incur additional costs proportional to the strength of the feedback signal. We use eye movements to test the hypothesis that motivation by reward improves precision by increasing the strength of internal negative feedback. We find that reward simultaneously increases the amplitude, velocity and endpoint precision of saccades, indicating true improvement in oculomotor performance. Analysis of trajectories demonstrates that variation in the eye position during the course of saccades is predictive of the variation of endpoints, but this relation is reduced by reward. This indicates that motivation permits more aggressive correction 2 of errors during the saccade, so that they no longer affect the endpoint. We suggest that such increases in internal negative feedback allow attractor stability, albeit at a cost, and therefore may explain how motivation improves cognitive as well as motor precision. |
| spellingShingle | Manohar, S Husain, M Muhammed, K Fallon, S Motivation dynamically increases noise resistance by internal feedback during movement |
| title | Motivation dynamically increases noise resistance by internal feedback during movement |
| title_full | Motivation dynamically increases noise resistance by internal feedback during movement |
| title_fullStr | Motivation dynamically increases noise resistance by internal feedback during movement |
| title_full_unstemmed | Motivation dynamically increases noise resistance by internal feedback during movement |
| title_short | Motivation dynamically increases noise resistance by internal feedback during movement |
| title_sort | motivation dynamically increases noise resistance by internal feedback during movement |
| work_keys_str_mv | AT manohars motivationdynamicallyincreasesnoiseresistancebyinternalfeedbackduringmovement AT husainm motivationdynamicallyincreasesnoiseresistancebyinternalfeedbackduringmovement AT muhammedk motivationdynamicallyincreasesnoiseresistancebyinternalfeedbackduringmovement AT fallons motivationdynamicallyincreasesnoiseresistancebyinternalfeedbackduringmovement |