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 L S L

> Diedrichsen et al L S L RPRSSIRPRSSI

> Diedrichsen et al. 2006; Heuer, Klein 2006 Psychol Res RPRSSIRS RP SI

Which movement parameters cause interference during the preparation of bimanual movements? Symmetric Starting locations Symmetric Amplitudes Symmetric Target locations Symmetric Starting locations Asymmetric Amplitudes Asymmetric Target locations All symmetric SATSAT

All symmetric SAT Symmetric amplitudes Asymmetric starting, targets SAT

Symmetric targets Asymmetric starting, amplitudes SAT Symmetric starting Asymmetric amplitudes, targets SAT All asymmetric SAT

Heuer, Klein 2006 J Mot Behav Manipulated symmetry/asymmetry of – Starting locations – Amplitudes – Target locations Confound – Number of movement choices depended on the starting locations Weigelt 2007 Manipulated symmetry/asymmetry of – Starting locations – Amplitudes – Target locations Confound – Symbolic cues

SATSATSATSATSAT

SATSATSATSAT

Method 30 participants – Right-handed 40 good trials per block Recorded RT and MT 10 cm 1.4 cm

SAT SATSAT

SATSAT * * *

SATSAT SATSAT * * n.s.

Conclusions > RPRSSIRS RP SI

SAT < More complex than programming only the amplitude

< SAT Symmetric targets More complex than programming only the target locations Symmetric targets

SAT < Movement amplitudes

< < Starting and target locations Symmetric startingAsymmetric starting Symmetric targetsAsymmetric targets

-8 ms SAT -2 ms SATSAT -10 ms SATSAT

-12 ms SAT -14 ms SAT -2 ms SAT

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, MC Carpenter, R Chua

SAT SATSAT

Movement time

Delta reaction time

Delta total time

Movement time correlations

Imperative Stimulus Recognition Target Discrimination Response Selection Response Programming Response Initiation Imperative Stimulus Recognition Response Initiation Choice reaction time Simple reaction time Imperative stimulus