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. 2001

L S L L

>

Diedrichsen et al. 2001

L S L L

RPRSSIRPRSSI

>

Diedrichsen et al. 2006; Heuer, Klein 2006 Psychol Res

RPRSSIRS RPSI

Which movement parameters cause interference during the preparation of bimanual movements?

Symmetric Starting locationsSymmetric Amplitudes

Symmetric Target locations

Symmetric Starting locationsAsymmetric Amplitudes

Asymmetric Target locations

All symmetric SATSAT

All symmetricSAT

Symmetric amplitudesAsymmetric starting, targets

SAT

Symmetric targetsAsymmetric starting, amplitudes

SAT

Symmetric startingAsymmetric amplitudes, targets

SAT

All asymmetricSAT

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

SAT SAT SAT SAT SAT

SAT

SAT

SAT

SAT

SAT

SAT

SAT

SATSATSATSAT

Method

• 30 participants– Right-handed

• 40 good trials per block• Recorded RT and MT

10 cm

1.4 cm

SAT

SATSATSATSAT

SAT

SATSATSATSAT

** *

SAT

SATSATSATSAT

SAT

SATSATSATSAT

* *

n.s.

Conclusions

>

RPRSSIRS RPSI

SAT

SAT

<

20 10 20 10

More complex than programming only the amplitude

<

SAT SAT

Symmetric targets

More complex than programming only the target locations

Symmetric targets

SAT

<SAT

Movement amplitudes

<

<

Starting and target locations

Symmetric starting Asymmetric starting

Symmetric targets Asymmetric targets

-8 ms

SAT

-2 ms

SAT

-10 ms

SAT

-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

SATSATSATSAT