In a subsequent study, Sinyor, et al. (1986) assessed

 both cognitive and vegetative signs of depression using a

 variety of verbal report measures in unilateral stroke

 patients. Contrary to the above findings, no overall

 differences in depression were found between groups.

 However, consistent with the above findings, severity of

 depression in LHD patients was positively related to

 proximity of the lesion to the frontal pole. In addition, a

 curvilinear relationship was found for RHD patients such

 that both anterior and posterior lesions were associated

 with depression. Moreover, House et al. (1990) reported

 that RHD patients may be depressed more than is believed,

 but due to their deficits in emotional communication, their

 depression goes undetected.

 Taken together, the results are equivocal. There is

 evidence in support of differential moods in left and right

 hemisphere damaged patients. Some investigators suggested

 that RHD patients express enhanced cheerfulness (e.g.,

 Terzian, 1964), and LHD patients express or report

 experiencing more depression than RHD patients (e.g.,

 Robinson et al., 1984). However, other investigators found

 no differences in depressed mood between LHD and RHD

 patients. Additionally, some studies revealed that during

 negative emotion, greater EEG activation was associated with

 anterior right activation. In contrast, during positive

emotion, greater EEG activation was associated with anterior