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  • 1
    Electronic Resource
    Electronic Resource
    Object awareness (1991)
    [s.l.] : Nature Publishing Group
    Nature 352 (1991), S. 202-202 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR — Libet1 makes three comments about our work. (1) We do not dispute that some forced-choice perceptual tests can be performed successfully without awareness2'3, but this is irrelevant to our recent claim4. We described tests of visual perception of orientation, shape and size which our ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/352202b0
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A neurological dissociation between perceiving objects and grasping them (1991)
    [s.l.] : Nature Publishing Group
    Nature 349 (1991), S. 154-156 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The patient, D.F., is a 35-year-old woman who suffered irreversible brain damage following carbon monoxide intoxication. Magnetic resonance imaging revealed damage ventrally in the lateral occipital region (mainly areas 18 and 19), and in the parasagittal occipitoparietal region, but ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/349154a0
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  • 3
    Electronic Resource
    Electronic Resource
    A mammalian model of optic-flow utilization in the control of locomotion (1992)
    Springer
    Experimental brain research 91 (1992), S. 171-175 
    Details
    ISSN: 1432-1106
    Keywords: Optic Flow ; Time-to-collision ; Locomotion ; Mongolian gerbil
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Gibson (1966, 1979) and Lee (1976) have described the potential usefulness of optic-flow information for the control of locomotion. One variable that might be particularly important for an animal approaching a target is time-to-collision, which Lee argues is most efficiently specified by the tau margin (the inverse of the relative rate of expansion of the target image on the retina). In humans, most empirical studies of optic flow have required perceptual judgements or have examined catching/intercepting behaviours. In animals, most studies have been strictly observational. This is particularly true for mammals, where there has been no experimental work of any kind looking at the control of locomotion. The present experiment demonstrates that the Mongolian gerbil (Meriones unguiculatus) uses time-to-collision information to control deceleration as it runs towards a target. The development of this animal model will aid investigation of the neural circuitry underlying optic flow utilization in motor control.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00230026
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    The perception and prehension of objects oriented in the depth plane (1996)
    Springer
    Experimental brain research 112 (1996), S. 442-451 
    Details
    ISSN: 1432-1106
    Keywords: Visual agnosia ; Visuomotor control ; Orientation ; Depth ; Binocular vision
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Previous studies have reported that the visual form agnosic D.F. is able to use information about visual targets for the control of motor acts, but has great difficulty in using the same visual information for perceptual report. This intact visuomotor performance may be mediated by relatively intact parieto-frontal cortical mechanisms. The present study investigated the ability of D.F. to use binocular and monocular information about the orientation of an object in the depth plane for perceptual and visuomotor purposes. A square plaque was presented at seven different orientations in depth to D.F. and to three age- and sex-matched control subjects. Subjects were required to reach out and grasp the plaque using a precision grip (index finger and thumb) under binocular and monocular viewing conditions, and in separate trials to match the orientation of a hand-held plaque to the perceived orientation of the target object, also under both binocular and monocular conditions. D.F.'s performance in grasping trials was found to be normal under binocular conditions, but was substantially worsened by removal of binocular vision. She was severely impaired at matching the orientation of the test square, although under binocular conditions her performance rose clearly above chance. The data suggest that the separation of cortical processing for visuomotor and visual perceptual purposes also applies, at least in part, to information about the orientation in depth of an object. The impaired performance under monocular viewing conditions on the visuomotor task is in agreement with recent physiological data and suggests that posterior parietal systems depend critically on binocular input for the processing of orientation in depth when ventral-stream information is unavailable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00227950
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