Kazuyoshi Fukuzawa

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present study investigated the effects of two-dimensional arm stiffness and muscle effort required to maintain horizontal arm posture on position-reproduction errors. 12 participants performed a multi-joint position-reproduction task without visual feedback. They were required to indicate a proprioceptively remembered target position with the fingertip of(More)
The present study attempted to demonstrate that the indicator arm influences end point distribution in contralateral multi-joint proprioceptive tasks and also that intrinsic physical characteristics of multi-joint arms (arm stiffness) may predict the error pattern. For this purpose, we carried out two types of contralateral localization tasks with(More)
We have con"rmed from human arm movement measurement on the sagittal plane that the highest position in the vertical direction where the hand passes through changes according to the motion duration. In this paper, we propose an estimation algorithm of the position where the hand passes through according to the variation in the motion duration. We add the(More)
The present study investigated the interactions between motor action and cognitive processing with particular reference to kanji-culture individuals. Kanji-culture individuals often move their finger as if they are writing when they are solving cognitive tasks, for example, when they try to recall the spelling of English words. This behavior is called(More)
The goal of this study was to elucidate the underlying mechanisms of hand and tool grasping control. We assumed that there is a single principle-governing grasping control irrespective of its effectors and that the degree of prior experience of the effector determines the smoothness of aperture control. Eight participants performed a reach-to-grasp task(More)
The present study investigated interactions between cognitive processes and finger actions called "kusho," meaning "air-writing" in Japanese. Kanji-culture individuals often employ kusho behavior in which they move their fingers as a substitute for a pen to write mostly done when they are trying to recall the shape of a Kanji character or the spelling of an(More)
In an attempt to understand the fundamental mechanism for movement disturbances in Parkinson's disease (PD) patients, we investigated their straightforward or right diagonally (laterally) steps and step over a stick. In all tasks, in PD patients, the movement latency was significantly longer and the movement duration was significantly shorter than those of(More)
Based on the minimum torque change model (MTCM), Wada and Kawato (1995) proposed a computational model of cursive handwriting which includes the following assumptions. The brain represents via-points that the hand passes through in a trajectory. Cursive handwriting consists of consecutive reaching movements. The via-points for handwriting are retrieved from(More)
We measured arm movement on the sagittal plane of parietal lobe damaged patients and control subjects. In neurological patients, (1) the hand height did not become lower as the motion duration became shorter; (2) the hand jerk of measured trajectory increased when motion duration lengthened. These results suggested that the parietal lobe is involved with(More)