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In Christie et al. (2008), there was an error in the second paragraph of the right column on page 382. The error occurs in the sentence ‘Similarly, endocrinologic stress responses because of the activity wheels are unlikely to underlie the changes seen in rPVT performance after 24 h SD as our measures of plasma corticosterone (CORT) indicate that SD in the wheel does elevate CORT (both controls and SD rats have <7 ng mL−1 CORT levels after 24 h SD; J. Tartar and R. Strecker, unpublished observations).’ This should have read ‘Similarly, endocrinologic stress responses because of the activity wheels are unlikely to underlie the changes seen in rPVT performance after 24 h SD as our measures of plasma corticosterone (CORT) indicate that SD in the wheel does not elevate CORT (both controls and SD rats have <7 ng mL−1 CORT levels after 24 h SD; J. Tartar and R. Strecker, unpublished observations).’

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