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  • 1
    Electronic Resource
    Electronic Resource
    Supplementary eye field: influence of eye position on neural signals of fixation (1992)
    Springer
    Experimental brain research 90 (1992), S. 302-306 
    Details
    ISSN: 1432-1106
    Keywords: Supplementary eye field ; Fixation units ; Orbital position ; Eye movements
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Single units were recorded in the supplementary eye field of monkeys performing visual-oculomotor tasks. Two patterns of unit activity were observed while the animals fixated photic stimuli. One consisted of a step in tonic firing frequency (either an increase or a decrease, depending on the cell), lasting as long as fixation. The occurrence of this pattern did not require the continuous presence of a stimulus but the animal had to be provided with an incentive to fixate a given location. The other pattern was a monotonically varying firing rate dependent on the eye orientation along a particular axis, indicative of eye eccentricity in orbit.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00227242
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The impact of stereotactic large-core needle biopsy in the treatment of patients with nonpalpable breast lesions: a study of diagnostic accuracy in 510 consecutive cases (1998)
    Springer
    European radiology 8 (1998), S. 1468-1474 
    Details
    ISSN: 1432-1084
    Keywords: Key words: Biopsy technology ; Breast biopsy ; Breast neoplasm ; diagnosis ; Stereotactic biopsy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. The objective of this study was to assess the usefulness of stereotactic large-core needle biopsy (LCNB) in the management of nonpalpable breast lesions (NBL) and compare it with stereotactic fine-needle aspiration biopsy (SFNA) performed simultaneously in a significant number of cases. From November 1993 through June 1997, 510 consecutive patients with NBL underwent 14-gauge LCNB with 354 women undergoing simultaneous 21-gauge SFNA in the same lesion. Mammographic findings, lesion size, number of core biopsy specimens, complications and diagnoses of both techniques were analysed. Surgical biopsy, tumorectomy or mastectomy was indicated for malignancy or poor correlation between SFNA or LCNB results and clinical or radiological findings. Values of diagnostic accuracy of both LCNB and SFNA were determined. The ratio benign surgical biopsies/malignant surgical biopsies (BB/CB) of the series was calculated. A total of 171 patients underwent surgical treatment; in 31 (18.1 %) a benign process or atypical ductal hyperplasia was the final diagnosis. The ratio BB/CB was 0.22. Sensitivity and specificity were 93.2 and 100 %, respectively, for LCNB, and 77.2 and 92.3 %, respectively, for SFNA with cytological analysis. Large-core needle biopsy provides more accurate diagnosis than SFNA in the management of nonpalpable breast lesions and obviates a surgical diagnostic procedure in a significant number of cases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003300050577
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  • 3
    Electronic Resource
    Electronic Resource
    Unit activity related to spontaneous saccades in frontal dorsomedial cortex of monkey (1985)
    Springer
    Experimental brain research 58 (1985), S. 208-211 
    Details
    ISSN: 1432-1106
    Keywords: Supplementary eye field ; Presaccadic discharges ; Spontaneous saccades ; Dorsomedial frontal cortex
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Single unit activity was studied in the dorsomedial edge of the frontal lobe, above the superior arcuate sulcus in three trained monkeys (Macaca nemestrina). Gaze and head movements were recorded with two magnetic search coils. Discharges preceding spontaneous eye movements in a preferred direction were consistently observed in light and in dark, in a limited cortical territory at the anterior border of the supplementary motor area. Microstimulation at these sites elicited saccades in the unit preferred direction. Five presaccadic units were studied head fixed and head free and showed the same saccade-related activity under both conditions. Preliminary data suggest that the area studied may be a supplementary eye field distinct from the arcuate frontal eye field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00238971
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  • 4
    Electronic Resource
    Electronic Resource
    Does microstimulation evoke fixed-vector saccades by generating their vector or by specifying their goal? (1987)
    Springer
    Experimental brain research 68 (1987), S. 442-444 
    Details
    ISSN: 1432-1106
    Keywords: Saccade ; Electrical stimulation ; Fixed-vector ; Retinotopic
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Electrical stimulation was performed at several sites of the monkey's forebrain producing fixed-vector saccades when the eyes were steady. When the same stimulation was applied during or immediately after a spontaneous eye movement, the saccade trajectory was considerably modified: the eyes were driven, from wherever they were deviated by the spontaneous movement, to the point where the fixed-vector saccade would have brought them if the spontaneous movement had not occurred. This finding implies first, that saccades evoked from these sites are directed toward a goal and, second, that the goal is defined with respect to an eye position sampled long in advance (before the spontaneous eye movement). This is consistent with the hypothesis that the electrical stimulation evoked the retinotopic representation of a target whose spatial coordinates were then computed at further stages to produce a saccade. Using the present paradigm, it may be possible to distinguish brain sites processing retinal error (at the visual stage) from those processing motor error (at the motor stage).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00248812
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  • 5
    Electronic Resource
    Electronic Resource
    Thalamic units firing upon refixation may be responsible for plasticity in visual cortex (1983)
    Springer
    Experimental brain research 50 (1983), S. 146-148 
    Details
    ISSN: 1432-1106
    Keywords: Nonspecific thalamus ; Unit recording ; Visual plasticity ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In alert cat and monkey, a unit type recorded in the region of the thalamic internal medullary lamina seems to provide the extraretinal signal postulated by Singer (1982) to explain the development of mature receptive field properties in cortical visual neurons. These thalamic units are silent (or silenced) during saccades in all directions; they discharge as soon as the eyes assume a new position. The abolition of this discharge by thalamic lesion, or conversely, its elicitation by electrical stimulation could respectively prevent or facilitate plastic changes in visual cortical areas of kittens.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00238241
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Visual responses of thalamic neurons depending on the direction of gaze and the position of targets in space (1980)
    Springer
    Experimental brain research 40 (1980), S. 170-184 
    Details
    ISSN: 1432-1106
    Keywords: Visual receptive field ; Spatial coding ; Absolute position ; Gaze control ; Nonspecific thalamus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Visual receptive field properties of neurons in the region of the thalamic internal medullary lamina were studied in alert cats while they fixated in various directions. In slightly more than 50% of the cells, the responsiveness of the cells was found to depend on the location of the stimulus with respect to the head-body axis (stimulus absolute position). A cell could ignore a stimulus outside its absolute field even if it was well placed within its receptive field. Three types of neurons were distinguished. Neurons with small central receptive fields were tonically activated when the animal fixated the stimulus in one half of the screen (usually contralateral). The firing rate of these cells was related to the stimulus absolute position measured along a preferred axis. Similarly, neurons with large receptive fields fired as a function of stimulus absolute position but stimulus fixation was not required. Neurons with eccentric fields responded to stimuli located in a target area defined in head-body coordinates. Such cells gave presaccadic bursts with eye movements terminating in the target area. The conclusion proposed is that neurons exist which code visual spatial information in a non-retinal frame of reference. This coding takes place at the time of stimulus presentation. Its role may be seen in the initiation of visually guided movements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00237535
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  • 7
    Electronic Resource
    Electronic Resource
    The spectrum of an octahedral molecule in a degenerate electronic state: The ν6 fundamental band of jet-cooled V(CO)6 (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 114 (2001), S. 10773-10779 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The jet-cooled FTIR spectrum of the ν6 fundamental band (C–O stretch) of vanadium hexacarbonyl, V(CO)6, is studied for the first time. The spectrum shows a very unusual structure consisting of three well-defined broad subbands, without the usual PQR structure. V(CO)6 being an open-shell system this is attributed to a dynamical F2g⊗F1u Jahn–Teller coupling which considerably complicates the analysis. A new theoretical model based on group theory and tensorial algebraic techniques is developed in this paper for the very first attempt to analyze such a rovibronic spectrum. The assumption of a negligible spin–orbit coupling is validated by the overall agreement between predicted and observed band profiles. The rovibronic Hamiltonian and dipole moment operators have been expanded in order to enable a simultaneous treatment of the four vibronic sublevels. We were able to satisfactorily reproduce the band profile and thus to give the first estimation of some rovibronic parameters for this molecule. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1374957
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  • 8
    Electronic Resource
    Electronic Resource
    A structural distortion in the 123-superconductor isomorph LaBa"2(Cu"2Nb)O"8
    Amsterdam : Elsevier
    Physica C: Superconductivity and its applications 167 (1990), S. 162-167 
    Details
    ISSN: 0921-4534
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0921-4534(90)90500-E
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  • 9
    Electronic Resource
    Electronic Resource
    Interlingual semantic facilitation: Evidence for a common representational system in the bilingual lexicon
    Amsterdam : Elsevier
    Journal of Memory and Language 25 (1986), S. 605-618 
    Details
    ISSN: 0749-596X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Psychology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0749-596X(86)90014-8
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    Lack of effect of acute acetaldehyde treatment on X chromosome segregation in Drosophila melanogaster females
    Amsterdam : Elsevier
    Mutation Research/Genetic Toxicology 320 (1994), S. 1-7 
    Details
    ISSN: 0165-1218
    Keywords: Acetaldehyde ; Aneuploidy ; Drosophila melanogaster ; Nondisjunction ; X chromosome segregation
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0165-1218(94)90054-X
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