Trampenau Leif, van Eimeren Thilo, Kuhtz-Buschbeck Johann
Klinik für Neurologie, Universitatsklinikum Schleswig-Holstein Campus Kiel, Kiel, Germany.
Department of Nuclear, Medicine, Universitätsklinikum Köln, Köln, Germany.
Atten Percept Psychophys. 2017 Feb;79(2):404-414. doi: 10.3758/s13414-016-1266-5.
We studied the effects of probabilistic cues, i.e., of information of limited certainty, in the context of an action task (GL: grip-lift) and of a perceptual task (WP: weight perception). Normal subjects (n = 22) saw four different probabilistic visual cues, each of which announced the likely weight of an object. In the GL task, the object was grasped and lifted with a pinch grip, and the peak force rates indicated that the grip and load forces were scaled predictively according to the probabilistic information. The WP task provided the expected heaviness related to each probabilistic cue; the participants gradually adjusted the object's weight until its heaviness matched the expected weight for a given cue. Subjects were randomly assigned to two groups: one started with the GL task and the other one with the WP task. The four different probabilistic cues influenced weight adjustments in the WP task and peak force rates in the GL task in a similar manner. The interpretation and utilization of the probabilistic information was critically influenced by the initial task. Participants who started with the WP task classified the four probabilistic cues into four distinct categories and applied these categories to the subsequent GL task. On the other side, participants who started with the GL task applied three distinct categories to the four cues and retained this classification in the following WP task. The initial strategy, once established, determined the way how the probabilistic information was interpreted and implemented.
我们在一个动作任务（GL：抓握提起）和一个感知任务（WP：重量感知）的背景下，研究了概率线索的影响，即确定性有限的信息的影响。正常受试者（n = 22）看到四种不同的概率视觉线索，每种线索都表明了一个物体可能的重量。在GL任务中，用捏握的方式抓住并提起物体，峰值力率表明抓握力和负载力根据概率信息进行了预测性缩放。WP任务提供了与每个概率线索相关的预期重量；参与者逐渐调整物体的重量，直到其重量与给定线索的预期重量相匹配。受试者被随机分为两组：一组从GL任务开始，另一组从WP任务开始。四种不同的概率线索以类似的方式影响WP任务中的重量调整和GL任务中的峰值力率。概率信息的解释和利用受到初始任务的严重影响。从WP任务开始的参与者将四种概率线索分为四个不同的类别，并将这些类别应用于随后的GL任务。另一方面，从GL任务开始的参与者将三种不同的类别应用于四种线索，并在随后的WP任务中保留了这种分类。一旦确立，初始策略就决定了概率信息的解释和实施方式。
