Functional dissociation of temporal processing mechanisms during speech production and hand movement: An ERP study
•Movement is faster for temporally predictable vs. unpredictable stimuli.•Premotor neural activities are attenuated for temporally predictable stimuli.•Premotor neural activities are correlated with movement reaction time.•Movement cessation is faster than its initiation in speech and hand systems.•...
Saved in:
| Published in: | Behavioural brain research Vol. 347; pp. 281 - 291 |
|---|---|
| Main Authors: | , |
| Format: | Journal Article |
| Language: | English |
| Published: |
Netherlands
Elsevier B.V
16.07.2018
|
| Subjects: | |
| ISSN: | 0166-4328, 1872-7549, 1872-7549 |
| Online Access: | Get full text |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | •Movement is faster for temporally predictable vs. unpredictable stimuli.•Premotor neural activities are attenuated for temporally predictable stimuli.•Premotor neural activities are correlated with movement reaction time.•Movement cessation is faster than its initiation in speech and hand systems.•Mechanisms of movement initiation and cessation are functionally dissociated.
Skilled motor actions are mediated by neural mechanisms that incorporate sensory feedback for driving or suppressing movement with remarkable temporal precision. The predictive coding model proposes that the brain performs this function by establishing an internal representation of timing to accelerate movement response time. However, it is unclear whether different neural mechanisms are involved in temporal processing of movement initiation and cessation. The present study examined how temporal information is encoded for initiation and cessation of speech and hand movement. Event-related potentials (ERPs) were recorded while young healthy subjects performed speech and hand movement initiation and cessation in response to temporally predictable and unpredictable visual stimuli. We found that predictable stimuli elicited faster movement in both speech and hand modalities, with shorter reaction times associated with movement cessation compared with initiation. Analysis of ERPs revealed that premotor neural activities were significantly attenuated before speech initiation and hand movement initiation and cessation for temporally predictable vs. unpredictable conditions, but an opposite pattern was observed for speech cessation. In addition, we observed that the premotor ERPs were significantly modulated during speech initiation vs. cessation, but no such effect was found during hand movement. Finally, we found that the premotor ERPs were strongly correlated with motor reaction time during movement initiation and cessation for speech and hand modalities only in response to temporally predictable stimuli. These findings indicate that premotor ERPs reflect a temporal predictive code for planning of movement initiation and cessation and highlight functional dissociation of temporal processing mechanisms in speech and hand motor systems. |
|---|---|
| Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
| ISSN: | 0166-4328 1872-7549 1872-7549 |
| DOI: | 10.1016/j.bbr.2018.03.028 |