Tanaka Yoshihiro, Bergmann Tiest Wouter M, Kappers Astrid M L, Sano Akihito
Department of Engineering Physics, Electronics and Mechanics, Graduate School of Engineering, Nagoya Institute of Technology, Nagoya, Japan.
Helmholtz Institute, Utrecht University, Utrecht, The Netherlands.
PLoS One. 2014 Mar 27;9(3):e93363. doi: 10.1371/journal.pone.0093363. eCollection 2014.
Haptic perception is bidirectionally related to exploratory movements, which means that exploration influences perception, but perception also influences exploration. We can optimize or change exploratory movements according to the perception and/or the task, consciously or unconsciously. This paper presents a psychophysical experiment on active roughness perception to investigate movement changes as the haptic task changes. Exerted normal force and scanning velocity are measured in different perceptual tasks (discrimination or identification) using rough and smooth stimuli. The results show that humans use a greater variation in contact force for the smooth stimuli than for the rough stimuli. Moreover, they use higher scanning velocities and shorter break times between stimuli in the discrimination task than in the identification task. Thus, in roughness perception humans spontaneously use different strategies that seem effective for the perceptual task and the stimuli. A control task, in which the participants just explore the stimuli without any perceptual objective, shows that humans use a smaller contact force and a lower scanning velocity for the rough stimuli than for the smooth stimuli. Possibly, these strategies are related to aversiveness while exploring stimuli.
触觉感知与探索性动作呈双向关联，这意味着探索会影响感知，而感知也会影响探索。我们能够根据感知和/或任务，有意识或无意识地优化或改变探索性动作。本文呈现了一项关于主动粗糙度感知的心理物理学实验，以探究随着触觉任务的变化，动作是如何改变的。在使用粗糙和光滑刺激物的不同感知任务（辨别或识别）中，测量所施加的法向力和扫描速度。结果表明，相较于粗糙刺激物，人类在光滑刺激物上使用的接触力变化更大。此外，与识别任务相比，他们在辨别任务中使用更高的扫描速度，且刺激物之间的休息时间更短。因此，在粗糙度感知中，人类会自发地使用不同的策略，这些策略似乎对感知任务和刺激物有效。一项对照任务表明，在该任务中参与者只是探索刺激物而没有任何感知目标，结果显示人类在粗糙刺激物上使用的接触力和扫描速度比在光滑刺激物上更小。这些策略可能与探索刺激物时的厌恶感有关。
