Mask stimulus triggers inhibition in subliminal visuomotor priming
Mask stimulus triggers inhibition in subliminal visuomotor priming
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DOI：
10.1007/s00221-008-1515-5
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发表时间：
2008-09-01
影响因子：
2
通讯作者：
Sumner, P.
中科院分区：
文献类型：
--
作者：
Boy, F.;Clarke, K.;Sumner, P.
为了解释正、负阈下视觉启动效应在反应时间上的逆转，大多数研究者提出启动效应对初始运动激活的抑制过程。然而，关于这种抑制是在运动系统内自我产生的还是由启动后出现的新刺激（通常是掩蔽）触发的刺激，他们存在分歧。为了解开这两个假设，在我们的研究中，面具物体可以出现在启动呈现之前，并向启动位置移动，最终掩盖它。在这种情况下，在启动之后没有新的刺激出现，一个积极的兼容性效应被发现;相反，在另外两个实验中，面具没有出现在启动呈现之前，我们恢复了经典的负兼容性效应。因此，启动后出现的面具在触发阈下启动产生的运动激活抑制中起着重要作用。
To explain the reversal in reaction time benefits between positive and negative subliminal visuomotor priming, most researchers propose the existence of inhibitory processes acting on the initial motor activation by the prime. However they diverge regarding whether this inhibition is self-generated within the motor system or stimulus-triggered by the appearance of novel stimuli following the prime (usually the mask). To disentangle these two hypotheses, in our study the mask object could appear before prime presentation and move toward the prime location so that it eventually masked it. In this condition, in which no new stimulus appeared after the prime, a positive compatibility effect was found. Conversely, in two other experiments in which the mask was not displayed before prime presentation, we retrieved the classical negative compatibility effect. Thus the appearance of the mask after the prime plays an important role in triggering inhibition of motor activation generated by subliminal primes.