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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Allergy 45 (1990), S. 0 
    ISSN: 1398-9995
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 268 (1977), S. 175-176 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] There are at least three primary areas in the primate cortex which seem to be involved in the preliminary processes of visual pattern analysis, and which are known to be organised retinotopically3'4. These three areas, known as VI, V2 and V3, give rise to commissural fibres which pass through the ...
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 218 (1968), S. 1276-1276 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Table 1 contains information about these monkeys. All four were purchased from the same source, but only Nos. 133 and 136 arrived in the same batch. All four were first trained on a tactile task (a simple shape or roughness discrimination task given in the dark). Animals 70 and 141 continued with ...
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Experimental brain research 31 (1978), S. 445-457 
    ISSN: 1432-1106
    Keywords: Superior colliculus ; Visual cortex ; Visually-guided locomotion ; Orienting reflex
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Rats with either bilateral ablations of superior colliculus, bilateral ablations of visual cortex, or sham operations were trained to run across a large arena towards a small illuminated target which varied in location from trial to trial. An impairment in this visually-guided running was apparent in the cortical group, but not in the collicular group. When, in a second experiment, the spatial relationships within the apparatus were changed by extending the entry-tunnel some distance into the arena, the running of the cortical group became even more impaired, while the collicular animals continued to run towards the targets under efficient visual control. In a third experiment, the effect of introducing a novel flashing light in various locations around the perimeter of the arena was investigated. It was found that unlike the other two groups, the collicular animals showed no orienting reflex to the novel stimulus when it was presented outside a broad central area of the visual field.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 349 (1991), S. 154-156 
    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
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Experimental brain research 57 (1984), S. 89-98 
    ISSN: 1432-1106
    Keywords: Visual evoked potentials ; Man ; Interhemispheric transmission time ; Intensity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Visual evoked potentials (VEPs) to bright or dim lateralised light flashes were recorded from homologous occipital and central sites. In a GO/NOGO reaction time task (Experiment 1) the latency of the N160 component of the VEP was found to be shorter from the contralateral hemisphere by approximately 16 ms at occipital sites, but only 3 ms centrally. In addition, there was a trend for the occipital contralateral latency advantage to increase with decreasing stimulus brightness. In Experiment 2 a wider intensity range and a simple visual reaction time task were employed. Contralateral N160 latency advantages were again found to be larger occipitally (approx 13 ms) than centrally (3 ms). Furthermore the occipital contralateral latency advantage was significantly increased at the lower stimulus intensity, while that from central sites remained constant. These data suggest that two types of interhemispheric relay can be distinguished — a sensory one recorded occipitally and a non-sensory one recorded from central sites.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Experimental brain research 56 (1984), S. 106-114 
    ISSN: 1432-1106
    Keywords: Vision ; Distractibility ; Rats ; Orienting ; Superior colliculus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Rats with bilateral lesions of the superior colliculus (SC) or with sham operations were trained on a modified version of the running task of Goodale and Murison (1975). The rats were required to shuttle between two large boxes, one of which required a choice between 5 doors, the other having only 1 door. A flashing distractor light at the side of a box was subsequently presented on once-daily test trials. For half the rats of each group these tests were given at 1 month and for the others at 3 months post-operatively. In agreement with previous studies, the SC-lesioned rats showed an abolition of orienting reactions to the distractor. (This was so in both boxes, i.e. a lower attentional load in the running task failed to alleviate the SC lesion-induced deficit.) However, only in the early-tested rats did the lesion cause a loss of freezing response to the distractor. Since in the late-tested group the rats froze but did not orient, it is suggested that the orienting loss at least in their case cannot be attributed to a partial visual field defect.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Experimental brain research 112 (1996), S. 442-451 
    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
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Experimental brain research 50 (1983), S. 166-172 
    ISSN: 1432-1106
    Keywords: Man ; Retina ; Nasotemporal overlap ; Dual representation ; Simple reaction time
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary When light flashes are presented laterally simple vocal and manual responses are faster to stimuli in the visual half-field having direct access to the responding hemisphere (an “uncrossed” reaction) than stimuli which go initially to the nonresponding hemisphere (a “crossed” reaction). In the latter case an interhemispheric crossing is presumably necessary and so the crossed-minus-uncrossed difference (CUD) can be identified with interhemispheric transmission time. This paradigm was used to investigate the problem of whether or not there is an overlap of ipsi- and contralaterally projecting ganglion cells at the border between nasal and temporal areas of the human retina, resulting in dual representation of the midline in the brain. If such an overlap does exist then presenting stimuli on this region ought to result in an abolition of the CUD since information would be equally available to both hemispheres. Accordingly vocal and manual reaction times to flashes presented at 1/2, 1, 2, and 4 deg of visual angle were measured. In both cases a consistent CUD was found and this was present at all four points. These results are interpreted as arguing against the existence of overlap in man though some alternative possibilities are discussed.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    European journal of pediatrics 147 (1988), S. 523-524 
    ISSN: 1432-1076
    Keywords: Infant sedation ; Temazepam
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Six infants with a history of wheezing were given temazepam syrup as sedation, to allow lung function tests to be performed. Despite doses ranging from 2.5 mg/kg–4.5 mg/kg only one infant remained a sleep for 1 h, the time taken for full lung function to be assessed. All other infants awoke within 15 min before test could be completed. Three infants developed hiccoughs and three were very irritable after awaking from sedation.
    Type of Medium: Electronic Resource
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