Bimanual reaches with symbolic cues exhibit errors in target selection

Bimanual reaches with symbolic cues exhibit errors in target selection

Jarrod Blinch, Brendan Cameron, Ian Franks, Romeo ChuaSchool of Human Kinetics

University of British Columbia

motorbehaviour.wordpress.com

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Do bimanual reaches with more cognitive visuomotor control processes compared to more automatic control exhibit greater coupling?

Research question

Do bimanual reaches with more cognitive visuomotor control processes compared to more automatic control exhibit greater coupling?

Do bimanual reaches with more cognitive visuomotor control processes compared to more automatic control exhibit greater coupling?

Do bimanual reaches with more cognitive visuomotor control processes compared to more automatic control exhibit greater coupling?

Do bimanual reaches with more cognitive visuomotor control processes compared to more automatic control exhibit greater coupling?

3Kelso, Putnam, & Goodman, 1979

Kelso, Southard, & Goodman, 1983

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L S L L

Diedrichsen, Hazeltine, Kennerley, & Ivry, 2001

Symbolic cues Spatial cuesAsymmetric movement Symmetric movement

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Reaction time cost with symbolic cues

• Coupling during movement preparation

• Increased processing demands on response selection– Translate two different

symbolic cues– Assign a movement to

each arm

Diedrichsen, Grafton, Albert, Hazeltine, & Ivry, 2006

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Research question

Do bimanual reaches with more cognitive visuomotor control processes compared to more automatic control exhibit greater spatial coupling?

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Method

• 16 participants• Spatial and symbolic cues• Optotrak L S

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9

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Symbolic, long-short,no modulations

Symbolic, short-long,modulations

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Discussion

• Increased cognitive processing for response selection with symbolically-cued asymmetric movements– Coupling was also related to response selection• Reaction time cost• Errors in target selection

• Coupling is limited to the processes that require greater cognitive control

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Spatial coupling

Franz, Zelaznik, Swinnen,& Walter, 2001

Swinnen, Lee, Verschueren,Serrien, & Bogaerds, 1997

Bimanual reaches with symbolic cues exhibit errors in target selection

Jarrod Blinch, Brendan Cameron, Ian Franks, Romeo ChuaSchool of Human Kinetics

University of British Columbia

motorbehaviour.wordpress.com

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Movement time

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Spatial

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Symbolic

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Delta reaction time (ms)

Symbolic, no modulations

Symbolic, modulations

Long-Short -10.2 -0.4

Short-Long 0.6 -9.4

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Online response selection