Abstract
No significant general cognitive impairment occurred in S [subject] samples with unilateral frontal lobe lesions. Impairment of cognitive performance was greater in Ss with lesions posterior to the Fissure of Rolondo than in well-matched Ss with frontal lobe lesions. Specific cognitive deficits are infrequent in Ss with frontal lobe lesions. No significant differential impairment of cognitive performance was associated with hemispheric lateralization of frontal lesions. No significant differential impairment of verbal and nonverbal performance was associated with hemispheric lateralization of frontal lesions.