The influence of attention and age on the occurrence of mirror movements

被引:48
作者
Baliz, Y
Armatas, C
Farrow, M
Hoy, KE
Fitzgerald, PB
Bradshaw, JL
Georgiou-Karistianis, N [1 ]
机构
[1] Monash Univ, Expt Neuropsychol Res Unit, Dept Psychol, Clayton, Vic 3800, Australia
[2] Deakin Univ, Sch Psychol, Geelong, Vic 3217, Australia
[3] Monash Univ, Dept Psychol Med, Clayton, Vic 3168, Australia
[4] Alfred Psychiat Res Ctr, Prahran, Vic, Australia
[5] Monash Univ, Dept Psychol Med, Clayton, Vic 3168, Australia
关键词
aging; corpus callosum; motor cortex; motor skills; corticospinal tract; movement disorders;
D O I
10.1017/S1355617705051003
中图分类号
R74 [神经病学与精神病学];
学科分类号
摘要
This study utilised a finger force task to investigate the influence of attention and age on the occurrence of motor overflow in the form of mirror movements in neurologically intact adults. Forty right-handed participants were recruited from three age groups: 20-30 years, 40-50 years, and 60-70 years. Participants were required to maintain a target force using both their index and middle fingers, representing 50% of their maximum strength capacity for that hand. Attention was directed to a hand by activating a bone conduction vibrator attached to the small finger of that hand. Based on Cabeza's (2002) model of hemispheric asymmetry reduction ill older adults, it was hypothesised that mirror movements would increase with age. Furthermore, it was expected that when the attentional demands of the task were increased, motor overflow occurrence would be exacerbated for the older adult group. The results obtained provide support for the model, and qualified support for the hypothesis that increasing the attentional demands of a task results in greater motor overflow. It is proposed that the association between mirror movements and age observed in this study may result from an age-related increase in bihemispheric activation that occurs in older adults, who, unlike younger adults, benefit from bihemispheric processing for task performance.
引用
收藏
页码:855 / 862
页数:8
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