Serrien Deborah J, Sovijärvi-Spapé Michiel M, Rana Gita
School of Psychology, University of Nottingham, University Park, Nottingham, NG7 2RD, UK.
Acta Psychol (Amst). 2012 Sep;141(1):73-7. doi: 10.1016/j.actpsy.2012.07.008. Epub 2012 Aug 2.
In the masked priming paradigm, motor responses to targets are influenced by previously presented subliminal primes, and are guided by facilitatory and inhibitory mechanisms that depend on prime-target compatibility/duration. In this study, we evaluate subliminal-driven priming in right- and left-handers during unimanual as well as bimanual tasks. The data from the unimanual tasks confirmed that prime-target compatibility affects performance as a function of prime-target duration. In a bimanual setting, the preferred hand benefitted from facilitation in both handedness groups whereas the non-preferred hand showed a positive priming effect only in left-handers. This denotes that left-handers are more susceptible to response activation of either hand. In addition, inhibitory priming had a stronger effect on the non-preferred than preferred hand, independent of handedness group. Overall, the findings suggest that subliminal-driven mechanisms that assist adaptive motor behavior are sensitive not only to extrinsic (task-related) factors such as prime-target compatibility but also to intrinsic (performer-related) factors such as hand dominance. The data further provide support for handedness-specific effects in motor functions and underline a significant role of hand dominance in the control of bimanual actions.
在掩蔽启动范式中，对目标的运动反应会受到先前呈现的阈下启动刺激的影响，并由促进和抑制机制引导，这些机制取决于启动刺激与目标的兼容性/持续时间。在本研究中，我们评估了右利手和左利手在单手以及双手任务中阈下驱动的启动效应。单手任务的数据证实，启动刺激与目标的兼容性会根据启动刺激与目标的持续时间影响表现。在双手任务设置中，优势手在两个利手组中都受益于促进作用，而非优势手仅在左利手组中表现出积极的启动效应。这表明左利手更容易受到任何一只手的反应激活。此外，抑制性启动对非优势手的影响比对优势手更强，且与利手组无关。总体而言，研究结果表明，辅助适应性运动行为的阈下驱动机制不仅对外部（与任务相关）因素如启动刺激与目标的兼容性敏感，而且对内部（与执行者相关）因素如手的优势性也敏感。数据进一步支持了运动功能中特定利手效应，并强调了手的优势性在双手动作控制中的重要作用。
