Welsh Timothy N, Elliott Digby
Department of Kinesiology, McMaster University, 1280 Main Street West, Hamilton, Ontario, Canada L8S 4K1.
Acta Psychol (Amst). 2005 Jun;119(2):123-42. doi: 10.1016/j.actpsy.2005.01.001. Epub 2005 Feb 10.
Two models of selective reaching have been proposed to account for deviations in movement trajectories in cluttered environments. The response vector model predicts movement trajectories should deviate towards or away from the location a distractor of little or large salience, respectively. In contrast, the response activation model predicts that a distractor with large salience should cause movement deviations towards it whereas a distractor with little salience should not influence the movement. The precuing technique was combined with the distractor interference paradigm to test these predictions. Results indicate that when the target was presented at the precued (salient) location, movements were unaffected by a distractor. Conversely, when the distractor was presented at the precued location while the target was presented at an uncued (non-salient) location, participants demonstrated increased reaction times and trajectory deviations towards the location of the distractor. These findings are consistent with the model of response activation.
为了解释在杂乱环境中运动轨迹的偏差，人们提出了两种选择性伸手模型。响应向量模型预测，运动轨迹应分别朝着或远离显著性小或大的干扰物的位置发生偏差。相比之下，响应激活模型预测，显著性大的干扰物应导致运动朝着它发生偏差，而显著性小的干扰物不应影响运动。预提示技术与干扰物干扰范式相结合来检验这些预测。结果表明，当目标出现在预提示（显著）位置时，运动不受干扰物影响。相反，当干扰物出现在预提示位置而目标出现在未提示（不显著）位置时，参与者表现出反应时间增加，并且运动轨迹朝着干扰物的位置发生偏差。这些发现与响应激活模型一致。
