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  • 1985-1989  (1)
  • 1980-1984  (1)
  • 1975-1979
  • 1935-1939
  • Awake monkey  (1)
  • Cell wall expansion  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Interactions of visual stimuli in the receptive fields of inferior temporal neurons in awake macaques (1989)
    Springer
    Experimental brain research 77 (1989), S. 23-30 
    Details
    ISSN: 1432-1106
    Keywords: Inferior temporal cortex ; Visual interaction ; Single neuron ; Awake monkey
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Monkeys were trained to perform a fixation task and a visual discrimination task. During the fixation task, one or two light bars were presented at different positions in the receptive fields of TE neurons. During the discrimination task, the animal was required to detect the positive stimulus when one or two of the paired small colored spots or two-dimensional patterns were presented. In both behavioral conditions, when the two light stimuli were presented simultaneously, almost none of the TE neurons showed an increase in responding over the single stimulus condition; the response was usually similar or less than the stronger response in the single stimulus condition. In the neurons that responded selectively to the discriminanda during the discrimination task, various interactions between the two antagonistic stimuli occurred depending on the location or the effectiveness of the two stimuli. These results may be related to gain control mechanisms in the wide receptive fields of TE neurons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00250563
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Negative phototropism in the piloboloid mutants of Phycomyces blakesleeanus Bgff. (1984)
    Springer
    Planta 162 (1984), S. 97-103 
    Details
    ISSN: 1432-2048
    Keywords: Cell wall expansion ; Light, phototropism ; Mutant (Phycomyces) ; Phototropism, negative ; Phycomyces ; Sporangiophore
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The sporangiophore (spph) of a piloboloid mutant, genotype pil, of Phycomyces ceases elongation and expands radially in the growth zone shortly after reaching the developmental stage IV b. The pil spph is always negatively phototropic to unilateral visible light when its diameter exceeds 210 μm. Photoinduction of spph initiation, light-growth response, threshold of light energy fluence rate for the negative phototropism, avoidance and gravitropism in the pil mutant are all normal. In liquid paraffin, the pil spph shows negative phototropism as does the wild-type spph. Genetic analyses indicate that the negative phototropism of the pil mutant is governed by the phenotypic characteristics of pil but not by specific gene(s) responsible for negative phototropism. These facts imply that the reverse phototropism of the pil mutant results from a loss of the convergent lens effect of the cell because of the increase in cell diameter.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00410204
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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