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  • 1
    Electronic Resource
    Electronic Resource
    The functional locus of the lateralized readiness potential (2004)
    Oxford, UK : Blackwell Publishing
    Psychophysiology 41 (2004), S. 0 
    Details
    ISSN: 1469-8986
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine , Psychology
    Notes: The lateralized readiness potential (LRP) is considered to reflect motor activation and has been used extensively as a tool in elucidating cognitive processes. In the present study, we attempted to more precisely determine the origins of the LRP within the cognitive system. The response selection and motor programming stages were selectively manipulated by varying symbolic stimulus response compatibility and the time to peak force of an isometric finger extension response. Stimulus response compatibility and time to peak force affected response latency, as measured in the electromyogram, in a strictly additive fashion. The effects of the experimental manipulations on stimulus- and response-synchronized LRPs indicate that the LRP starts after the completion of response-hand selection and at the beginning of motor programming. These results allow a more rigorous interpretation of LRP findings in basic and applied research.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1469-8986.2004.00150.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Are fingers special? Evidence about movement preparation from event–related brain potentials (2003)
    Boston, USA and Oxford, UK : Blackwell Publishing Inc.
    Psychophysiology 40 (2003), S. 0 
    Details
    ISSN: 1469-8986
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine , Psychology
    Notes: Ulrich, Leuthold, and Sommer (1998) suggested that movement preparation at the level of the motor cortex, as indexed by the lateralized readiness potential (LRP), proceeds in a strongly hierarchical fashion, where parameters other than response hand are prepared only if all the movement parameters are known. These conclusions were based on an experiment where a precue provided information about response hand, direction of finger movement, and movement force. To assess the generality of these findings, we replaced the force parameter with response finger. LRP indicated that preparation of the required finger is possible even when preliminary information is incomplete. Therefore, movement preparation appears to follow different rules when anatomical relationships (hand and finger) are concerned as compared to functional parameters like movement direction. On the other hand, at a limb–unspecific level, as indicated by the contingent negative variation, we confirmed evidence for parallel programming of all movement parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/1469-8986.00002
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Task-dependent mixtures of coordinate systems in visuomotor transformations (1998)
    Springer
    Experimental brain research 119 (1998), S. 224-236 
    Details
    ISSN: 1432-1106
    Keywords: Key words Visuomotor transformation ; Sensorimotor integration ; Reference systems ; Human
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  In two experiments the involvement of relative and fixed coordinate systems in visuomotor transformations was examined. The experimental task required the successive performance of two movements in each trial, which had to “correspond” to different visual stimuli. One kind of visual display indicated target positions by way of different horizontal positions of a vertical line on a monitor (position mode), while the other indicated movement amplitudes by way of different lengths of a horizontal line (amplitude mode). Formal analysis of variances and covariances of successive individual movements led to the conclusion that in the position mode visuomotor transformations were based on a mixture of relative and fixed coordinate systems, while in the amplitude mode only a relative coordinate system was involved. Thus, visuomotor transformations can be characterized as mixtures of different coordinate systems, and their respective weights in the mixtures are task-dependent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002210050336
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Changed visuomotor transformations during and after prolonged microgravity (1999)
    Springer
    Experimental brain research 129 (1999), S. 378-390 
    Details
    ISSN: 1432-1106
    Keywords: Key words Manual tracking ; Microgravity ; Visuomotor transformation ; Adaptation ; Human ; Spaceflight
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  A series of step-tracking experiments was conducted before, during, and after a 3-week space mission to assess the effects of prolonged microgravity on a non-postural motor-control task. In- and post-flight accuracy was affected only marginally. However, kinematic analyses revealed a considerable change in the underlying movement dynamics: too-small force and, thus, too-low velocity in the first part of the movements was mainly compensated by lengthening the deceleration phase of the primary movement, so that accuracy was regained at its end. The observed in-flight decrements in peak velocity and peak acceleration point to an underestimation of mass, in agreement with the re-interpretation hypothesis of Bock et. al. Post-flight no reversals of the in-flight changes (negative aftereffects) were found. Instead, there was a general slowing down, which could be due to post-flight physical exhaustion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002210050906
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    Paper (German National Licenses)
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