Electrodermal responses in patients with unilateral brain damage

Skin conductance responses (SCR) to emotional and to nonemotional stimuli were measured in 16 right and 16 left unilateral brain-damaged patients. Replicating findings by Morrow, Vrtunski, Kim, & Boller (1981), those patients with a lesion in the left hemisphere showed higher SCR's to emotional than to nonemotional stimuli while those with a right lesion showed no difference between them. This pattern of results remained when variance in performance on a Facial Expression Recognition task was partialled out, suggesting that the absence of differentiated arousal in right-brain-damaged patients is unrelated to their impairment in perceptual analysis.