Posterior cortical lesion influences on successive discrimination reversal performance by rats

Treichler, F. Robert; Conley, Edward J.

doi:10.3758/bf03332972

Cited by 5 publications

(3 citation statements)

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“…For both tasks, the animals required about as many trials postoperatively as were needed to reach the original acquisition criterion. This severe impairment and subsequent restitution of performance is reminiscent of many other reports of posterior cortical lesion effects on brightness discrimination (N. D. leVere & T. E. leVere, 1982; T. E. Levere, 1980;Meyer & Meyer, 1977;Santucci & Treichler, 1985;Santucci et al, 1986;Treichler & Conley, 1982). The similarity of consequences observed on both the multidimensionally different object problems and the unidimensionally different brightness (flux) problem suggests that the object problems might have been solved as visual problems on the basis of differential brightness and/or array of flux cues.…”

Section: Discussionsupporting

confidence: 70%

“…Surgery was performed under Chloropent anesthesia (Fort Dodge Laboratories, Inc., Fort Dodge, IA; 3.33 ml/kg, i.p.) with extents of damage intended to include the areas removed by Meyer and Meyer (1977), Treichler and Conley (1982), and T. E. Levere, N. D. LeVere, Chappell, and Hankey (1984). A postoperative period of approximately 14 days followed surgery.…”

Section: Methodsmentioning

confidence: 99%

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Concurrent object-discrimination learning in rats

Santucci

Treichler

1990

Animal Learning & Behavior

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Investigations employing primates have sometimes used tests of concurrent object-discrimination as indexes of multiproblem memory in comparative studies of neuropathological impairment. The present investigation was an attempt to employ a comparable test procedure with rats. Data from two experiments indicated that rats could indeed be trained on a concurrent objectdiscrimination task. Furthermore, results from the second experiment indicated that these performances and brightness discriminations shared the property of disruption by posterior decortication. Implications for the neuropsychology of learning and memory are discussed.

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Section: Discussionsupporting

confidence: 70%

Section: Methodsmentioning

confidence: 99%

Concurrent object-discrimination learning in rats

Santucci

Treichler

1990

Animal Learning & Behavior

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“…To minimize potential confounding effects of heat and/or odor cues, the illumination of specific cubes was varied at least once every five trials and the apparatus and objects were washed with a disinfectant between the test sessions of different animals. aspirative lesions of the posterior portion of the neocortex with extents of damage intended to include the areas removed by Jonason et al (1970) and Treichler and Conley (1982). A 10-to 14-day postoperative recovery period followed surgery; unoperated control subjects (n = 8, open field; n = 9, Y-maze) had a similar period of no testing after completion of original learning.…”

Section: Methodsmentioning

confidence: 99%

Effect of posterior cortical lesion on two versions of the brightness-discrimination task

Santucci

Treichler

1985

Psychobiology

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The brightness-discrimination performance. of normal and posterior decorticate rats was measured in two test situations designed to provide different spatial task characteristics. A Y-maze and an open field with otherwise matched stimulus properties provided tests with many or few spatial characteristics, respectively. In contrast to predictions from visuospatial integrative interpretations of lesion consequences, the present results indicated no attenuation of the typical operative impairment when the reduced spatial-cue tasks were employed. Furthermore, this outcome was common to both simple acquisition/retention (Experiment 1) and successive discrimination reversal (Experiment 2) versions of the tasks. Interpretations of the relative contribution of memory or visuospatial integrative deficits to the measured behavioral consequences are discussed. Among alternative views advanced to account for the brightness-discrimination losses exhibited upon removal of the rat's posterior cortex are both memorial and visuospatial interpretations. In support of the former, Meyer (1972) has suggested that a preoperatively established memory is not destroyed by a lesion, but, rather, that access to the stored information is impaired. Braun, Meyer, and Meyer (1966) and lonason, Lauber, Robbins, Meyer, and Meyer (1970) have provided empirical support for this interpretation by demonstrating that an amphetamine dose that does not affect acquisition of a brightness task in naive posterior decorticates does enhance the relearning of the task in similarly lesioned animals. Le-Vere and LeVere (1982), in agreement with Meyer, have provided a retrieval-based explanation of the typical brightness-discrimination deficit. They have suggested that injury to a part of the integrative system produces a behavioral impairment wherein the neurological control of behavior is shifted to other noninjured, but less efficient, neural systems. When the organism comes to once again utilize the injured, but still functional, neurological system, performance is restored and recovery is inferred. Apart from the neurological mechanisms, this view implies that the memory is maintained and the behavioral deficit is based on a temporary inability to retrieve the previously stored information. The authors thank D. C. Riccio and P. Kasenow for their comments on an earlier version of this manuscript. Also, the help of Y. Hines in histology and M. Ryland and C. Velazquez in behavioral testing is gratefully acknowledged.

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Facilitative effects of cross-modality training on recovery of a conditioned avoidance response following striate cortex ablations in the rat

Delay¹

1988

Neuropsychologia

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Posterior cortical lesion influences on successive discrimination reversal performance by rats

Cited by 5 publications

References 8 publications

Concurrent object-discrimination learning in rats

Concurrent object-discrimination learning in rats

Effect of posterior cortical lesion on two versions of the brightness-discrimination task

Facilitative effects of cross-modality training on recovery of a conditioned avoidance response following striate cortex ablations in the rat

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