EEG waves in the parietal and frontal lobes. Negative pictures activated the left hemisphere in women more than in men, and the right hemisphere in men more than in women when shown unpleasant images. Evidence of lateralization The vast majority of the data comes from functional imaging, skin conductance response (SCR), standardized tests ranging from cognitive (e.g. IQ tests) to emotional intelligence, and subjective questionnaires such as those rating how fearful or happy faces look. All the tests have their strengths and weakness (see "Limitation of Studies" below). This section primarily focuses on results on the more subjective observations and results that have unknown neural basis or regions. Behavioral differences and cortical activation 70% of right handed patients show preference in viewing emotion expressed on the right side of the face (in the left field of view) according to studies using chimeric faces produced using right-right or left-left mirrored faces. The left side of the face seems more fluent in expressing emotions which means the right cortical hemisphere is more fluent in expressing emotions. Handedness does not appear to affect the processing associated with viewing facial expressions. Situations that contradict moral teachings generally produce negative emotions. Watching people behave badly by breaking moral codes most significantly activates the right parahippocampal gyrus, the right medial frontal gyrus, and left amygdala. Watching emotionally negative situations most significantly activates the right amygdala. This study indicates that lateral processing of emotions extends beyond the basic emotions to higher cognitive responses. Depression or having previously been depressed probably is due to altered brain structure or alters brain structure. Patients who have been depressed or are depressed show more activation to negative stimuli in emotion. When negative stimuli were presented to patients' right hemispheres, the patients were significantly more accurate and quicker to respond to the stimuli. The data in this study shows that psychological disorders are correlated with increased lateralization. Facial expressions of emotion Patients with damage to their left amygdala lesions rated fearful faces less fearful than normal subjects. Similar findings showed that regional blood flow increased in response to fear faces while decreased to euphoric faces in the left amygdala. Chimpanzees, other primates, and humans produce asymmetrical facial expressions with greater expression on the left side of the face (right hemisphere of the brain). Researchers also subjectively reported that the left side of the face was expressing more emotion using images of left-left