Sumner Petroc, Brandwood Tracey
School of Psychology, Cardiff University, Cardiff, United Kingdom.
J Mot Behav. 2008 Nov;40(6):484-9. doi: 10.3200/JMBR.40.6.484-490.
Masked stimuli can cause partial motor activation and prime responses to subsequent stimuli. Under certain conditions, a biphasic pattern appears, such that positive priming precedes a negative phase, which has been interpreted as evidence of an inhibitory mechanism that suppresses the motor activity caused by the prime. In this article, the authors report evidence for a further reversal in priming: In two experiments, the authors found that the negative compatibility effect was followed by a small but repeatable positive priming effect at an interval of approximately 500 ms between prime and target. Thus, masked primes appear to produce a triphasic pattern of priming, which is consistent with the notion that oscillation between facilitation and inhibition may be a fundamental property of the competitive interactions between response alternatives in the motor system.
掩蔽刺激可引起部分运动激活并引发对后续刺激的反应。在某些条件下，会出现双相模式，即正向启动先于负向阶段，这被解释为存在一种抑制机制的证据，该机制可抑制启动所引起的运动活动。在本文中，作者报告了启动效应进一步反转的证据：在两项实验中，作者发现负向兼容性效应之后，在启动刺激与目标刺激之间间隔约500毫秒时，会出现一个小但可重复的正向启动效应。因此，掩蔽启动刺激似乎会产生一种三相启动模式，这与促进和抑制之间的振荡可能是运动系统中反应选项之间竞争性相互作用的基本属性这一观点相一致。
