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Volume 17, Number 22, Issue of November 15, 1997 pp. 8919-8926

Unilateral Lesions of the Dorsal Striatum in Rats Disrupt Responding in Egocentric Space

Received Aug. 6, 1997; accepted Sept. 5, 1997.

Peter J. Brasted¹, Trevor Humby¹, Stephen B. Dunnett^{1, 2}, and Trevor W. Robbins^{1, 2}

¹ Medical Research Council Cambridge Centre for Brain Repair and ² Department of Experimental Psychology, University of Cambridge, Cambridge, CB2 2PY, United Kingdom

Rats were trained in a specially designed, multichoice operant chamber on a visual choice reaction time task designed to assess performance on each side of the rat's body. The task required animals to sustain a nose poke in a central hole, until a brief light stimulus was presented in either of two holes that were located on the same side of the box. Once the rats were trained to perform the task to both sides independently they received unilateral injections of quinolinic acid into the dorsal striatum.

Postoperatively, lesioned animals were impaired when performing the task on the side contralateral to the lesion. The time taken to initiate contralateral responses was increased. Contralateral responses were also exclusively biased toward the nearer of the two response locations, regardless of the location of the stimulus. This was interpreted as a specific impairment in generating responses in contralateral space. In contrast, no comparable deficit was seen when the animals performed the task on the side ipsilateral to the lesion. Additional postoperative challenges, in which response options were presented bilaterally, showed this response deficit to be defined in egocentric coordinates, with the severest response deficits for the most contralateral locations.

Key words: striatum; neglect; rat; excitotoxin; movement; egocentric; Huntington's disease

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