jarrod blinch, bg rasman , k clark, c may, bd cameron, im f ranks, mg carpenter, r chua

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Interference during the preparation of bimanual movements: the role of asymmetric starting locations, movement amplitudes, and target locations. Jarrod Blinch, BG Rasman , K Clark, C May, BD Cameron, IM F ranks, MG Carpenter, R Chua. L L. L S. >. ≈. Diedrichsen et al. 2001. L L. L S. - PowerPoint PPT Presentation

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Interference during the preparation of bimanual movements: the role of asymmetric starting locations, movement amplitudes, and target locations Jarrod Blinch, BG Rasman, K Clark, C May,BD Cameron, IM Franks, MG Carpenter, R Chua

>Diedrichsen et al. 2001L SL LAsymmetric vs. symmetricRT as a measure of movement preparationAsymmetric cost ~100 msSpatial cuesNo larger RT cost2>Diedrichsen et al. 2001L SL LRPRSSIRPRSSI>Diedrichsen et al. 2006; Heuer, Klein 2006 Psychol ResRPRSSIRSRPSIWhich movement parameters cause interference during the preparation of bimanual movements? Symmetric Starting locationsSymmetric AmplitudesSymmetric Target locationsSymmetric Starting locationsAsymmetric AmplitudesAsymmetric Target locationsAll symmetric SATSAT5All symmetricSATSymmetric amplitudesAsymmetric starting, targetsSATSymmetric targetsAsymmetric starting, amplitudesSATSymmetric startingAsymmetric amplitudes, targetsSATAll asymmetricSATHeuer, Klein 2006 J Mot Behav Manipulated symmetry/asymmetry ofStarting locationsAmplitudesTarget locationsConfoundNumber of movement choices depended on the starting locations

Weigelt 2007Manipulated symmetry/asymmetry ofStarting locationsAmplitudesTarget locationsConfoundSymbolic cuesHKContribution of starting locations to the bimanual asymmetric cost was not analysedConfoundReaction times can increase with the number of movement choicesWeigeltConfoundGreater processing demands on response selection and response programming8SATSATSATSATSATSATSATSAT6 blocksSpatial cues2 movement choices in each blockSame starting positionsEach arm could go to the short- or long-distance targetCollapse RTs into the five different conditions of symmetric and asymmetric9SATSATSATSATSATSATSATSATExamine potential RT savingsAll asymmetric compared to movements with 1 symmetric parameterChange one parameter at a timeExamine potential RT costsAll symmetric compared to movements with 2 asymmetric parametersChange two parameters at a time10Method30 participantsRight-handed40 good trials per blockRecorded RT and MT

10 cm1.4 cm

SATSATSATSATSATReaction times in the five conditions in ascending orderAll symmetric, shortest RTsAll asymmetric, longest RTs3 conditions with 1 symmetric parameter and 2 asymmetric parameters in the middle

12

SATSATSATSATSAT***All movements with one symmetric parameters had RTs that were shorter than movements with all asymmetric parametersMovement preparation is facilitated when any single parameter is symmetric13

SATSATSATSATSAT

SATSATSATSATSAT**n.s.No RT costs for movements with asymmetric starting and target locationsRT costs for movements with asymmetric amplitudes and targets AND starting locations and amplitudesHowever, there may be no costs for asymmetric starting and target locationsThe remaining asymmetric parameter for the conditions with costs is movement amplitudeAsymmetric amplitudes may cause more interference than asymmetric starting or target locations14Conclusions>RPRSSIRSRPSIMovement preparation for bimanual reaching movements is facilitated when any single parameter is symmetricAnd asymmetric amplitudes may cause the largest interferencePrevious studies have suggested that asymmetric parameters cause greater processing demands on RPWhat does this tell us about the response programming of bimanual movements?15SATSAT