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  • 1985-1989  (2)
  • 1985  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Rearrangements in the retino-geniculate projections of rats following ablation of the superior colliculus in infancy (1985)
    Springer
    Experimental brain research 59 (1985), S. 372-381 
    Details
    ISSN: 1432-1106
    Keywords: Superior colliculus ; Dorsal lateral geniculate nucleus ; Aberrant retinal projections ; Early brain damage
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The superior colliculus was bilaterally or unilaterally ablated at different early postnatal ages in rats. When adult, each rat received a unilateral eye injection of Horesradish peroxidase to reveal the crossed and uncrossed retinal terminal fields within the dorsal lateral geniculate nucleus. Collicular ablation in the first seven days after birth, but not thereafter, produced a small hole or vacancy within the contralateral retinal terminal field which was occupied by an aberrant ipsilateral retinal terminal field. These rearrangements in the retino-geniculate projections occurred in the caudal quarter of the nucleus dorso-laterally just beneath the optic tract, solely ipsilateral to the ablated colliculus. Possible causes of the formation of these rearrangements are discussed, and similarities with other aberrant retinal projections following early damage to the visual system are considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00230917
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    A comparison of the effects of superior collicular ablation in infant and adult rats (1985)
    Springer
    Experimental brain research 59 (1985), S. 302-312 
    Details
    ISSN: 1432-1106
    Keywords: Rats ; Infant vs. adult lesions ; Tectum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Rats sustaining damage to the superior colliculus in infancy or adulthood and sham-operated controls were tested on two tasks requiring visual orienting to ‘unexpected’ and ‘expected’ stimuli, respectively. Experiment 1 measured the distracting effect of novel visual and auditory stimuli presented while the animals traversed a familiar runway. Control rats oriented to the distracting stimulus and had lengthened running times on the trials where it was presented. Rats with lesions of the superior colliculus were less distracted by the appearance of unexpected stimuli than sham operated controls but the severity of this effect depended on modality, and on age at operation. Experiment 2 examined the same animals' ability to detect and respond to a small and expected light that appeared at randomly determined positions around the perimeter of a chamber while the rat was at the centre. Filmed records and analyses of response latencies and errors showed that at low stimulus intensities, the active exploration shown particularly by infant-operated animals resulted in performance that was superior to that of adult-operated animals and, at least in terms of error rate, sham-operated controls. It is concluded that unusual behavioural strategies can explain all the differences between the animals operated at different ages. There was no evidence that novel projections from the retina were responsible.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00230910
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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