Pawel Kaluzny

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The recently developed qualitative method of diagnosis of dynamical systems-recurrence plots-has been applied to the analysis of dynamics of neuronal spike trains recorded from cerebellum and red nucleus of anesthetized cats. Recurrence plots revealed robust and common changes in the similarity structure of interspike interval sequences as well as(More)
The experiment examined the anticipatory modulation of grip force with respect to load force during a drawer opening task. An impact force was introduced by a mechanical stop that arrested movement of the pulling hand. The results showed a typical grip force profile which consisted of two evolving phases, one to control drawer movement onset, and the other(More)
The issue of bimanual temporal coordination in human subjects is discussed for three selected movement paradigms: (i) simple, symmetric, bimanual finger movements, (ii) bimanual unloading, and (iii) a complex bimanual pull and grasp task. Temporal synchronization was found for all three experiments and was least variable for the first experiment. In the(More)
The properties of the sensorimotor system controlling finger movements were investigated in the simple uni- and bimanual reaction time (RT) paradigm, with emphasis on the problem of interhemispheric transfer of sensory and motor information. Unimanual and bimanual responses of the index fingers were elicited by stimulation of either left or right hand and(More)
OBJECTIVES The aim of the study was to test manipulative capacities of hemiparetic patients with partial recovery in a drawer task. The main objective was to assess adjustments of grip force in the face of load perturbations. METHODS The task was to pull and to hold the drawer manipulandum during predictable or unpredictable perturbations with short (90(More)
The principal-component approach is applied to the analysis of sequences of neuronal action potentials (spike trains). Multiple spike trains are represented as a sequence of vectors of mutual interspike intervals and are considered to be part of the trajectory of a dynamic system. The trajectory matrix is decomposed into a number of 'basic spike patterns'(More)
Two different drawer tasks were investigated with the aim of assessing the role of eye movements in well-coordinated hand movements. In an unimanual step-tracking task, which had a predictive and an unpredictive movement, a two-way repeated-measures ANOVA showed a significant effect of prediction on the onset of grip-force (GF) rate (300+/-39 ms for the(More)
The aim of the present study was to investigate postural adjustments and positional stability in a bimanual unloading task, involving essentially the index finger, in order to test whether proactive adjustments are also observed in distal body segments. A second goal of the study was to evaluate the concept of a central command that would be responsible for(More)
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