Body-specific motor imagery of hand actions: neural evidence from right- and left-handers reports a functional magnetic resonance imaging study on motor imagery on left-handers and right-handers.
 Abstract from open access paper
If motor imagery uses neural structures involved in action execution, then the neural correlates of imagining an action should differ between individuals who tend to execute the action differently. Here we report fMRI data showing that motor imagery is influenced by the way people habitually perform motor actions with their particular bodies; that is, motor imagery is ‘body-specific’ (Casasanto, 2009). During mental imagery for complex hand actions, activation of cortical areas involved in motor planning and execution was left-lateralized in right-handers but right-lateralized in left-handers. We conclude that motor imagery involves the generation of an action plan that is grounded in the participant’s motor habits, not just an abstract representation at the level of the action’s goal. People with different patterns of motor experience form correspondingly different neurocognitive representations of imagined actions.
Group 1 of 16 left-handed left-handed with 4 males and 12 females were included in the study.
The Dutch group had a mean age of 23.4 with a range from 19 to 32.
The study on the human subjects was approved by the Local ethics committee
Group 2 of 16 right-handed with 6 males and 10 females were included in the study.
The Dutch group had a mean age of 23.2 with a range from 20 to 29.
The study on the human subjects was approved by the Local ethics committee.
|MRI Scanning (help)
(TR=2060ms, TE=30ms, FA=85°)
|| resolution=3.5 x 3.5 x 3mm
For fMRI EPI scans were acquired with a 3TT Siemens scanner..
The brain scans were analyzed with SPM5 with spatial normalization to MNI space.
The statistical threshold is at P<0.05 corrected on cluster extent after thresholding on P<0.005 uncorrected (see table caption)
 Manual motor imagery versus non-manual
14 coordinates in Table 2
 Manual motor imagery versus non-manual in left-handers
12 coordinates in Table 3, part 1.
 Manual motor imagery versus non-manual in right-handers
10 coordinates in Table 3, part 2.