Dl. Jones et al., ALLOCATION OF ATTENTION TO PROGRAMMING OF MOVEMENT SEQUENCES IN PARKINSONS-DISEASE, Neuropsychology, development, and cognition. Section A, Journal of clinical and experimental neuropsychology, 16(1), 1994, pp. 117-128
The allocation of attention to the programming and execution of moveme
nt sequences was examined in Parkinson's disease (PD). The time taken
to initiate and execute sequences of one, three, and five button taps
was examined, while also varying the hand used (left or right) and the
attentional resources that could be allocated to sequencing (using si
ngle- versus dual-task conditions). These results showed that performa
nce anomalies in PD were most apparent with the preferred right hand u
nder single-rather than dual-task conditions. Subjects suffering from
PD may tend to divert attention from the right hand under single-task
conditions, and perhaps with short sequences, as well as being less li
kely to prepare sequences of more than three movements in advance with
that hand. These effects were unlikely to reflect asymmetric patholog
y. If the right hand of such subjects has in some respects now come to
behave more like a ''clumsy'' left hand, this may reflect a deliberat
e strategic choice in an attempt to cope with a movement impairment.