Hemispheric asymmetries of a motor memory in a recognition test after learning a movement sequence

- Using a visual-half-field paradigm we studied the lateralization of a motor memory.
- In addition, a transfer design was used to determine the coding system.
- Dominant right and dominant left-handers were tested.
- Dominant right-handers showed a right-visual-field left hemisphere advantage.
- Dominant left-handers showed a right-visual-field left hemisphere advantage.

Two experiments utilizing a spatial-temporal movement sequence were designed to determine if the memory of the sequence is lateralized in the left or right hemisphere. In Experiment 1, dominant right-handers were randomly assigned to one of two acquisition groups: a left-hand starter and a right-hand starter group. After an acquisition phase, reaction time (RT) was measured in a recognition test by providing the learned sequential pattern in the left or right visual half-field for 150 ms. In a retention test and two transfer tests the dominant coordinate system for sequence production was evaluated. In Experiment 2 dominant left-handers and dominant right-handers had to acquire the sequence with their dominant limb. The results of Experiment 1 indicated that RT was significantly shorter when the acquired sequence was provided in the right visual field during the recognition test. The same results occurred in Experiment 2 for dominant right-handers and left-handers. These results indicated a right visual field left hemisphere advantage in the recognition test for the practiced stimulus for dominant left and right-handers, when the task was practiced with the dominant limb.