the different roles of the left and right hemispheres of the brain in the generation and regulation of emotions. In particular, the frontal lobe of the left hemisphere is believed to be linked to positive emotions; injury or damage to this region results in loss of positive affect. By contrast, the frontal lobe of the right hemisphere is more related to negative emotions (e.g., sadness, fear), with lesions to this portion of the brain resulting in loss of negative affect. Alternatively, the left frontal region is regarded as controlling emotions involving approach, and the right frontal region as controlling emotions involving avoidance.