in most cases what appear to be the two main causes of emotional or behavioral disorders
Causes of mental disorders During most of the 20th century, mental illness was believed to be caused by problematic relationships between children and their parents. This view was held well into the late 1990s, in which people still believed this child-parent relationship was a large determinant of severe mental illness, such as depression and schizophrenia. Today,[when?] the belief is held that the child-parent relationship is of small importance in terms of causing mental illness compared to biological and genetic factors[citation needed]. So, the perceived causes of mental illness have changed over time and will most likely continue to alter while more research is done in this area.[15]
Right hemisphere brain damage Patients with right hemisphere brain damage most commonly have difficulties with attention, perception, learning, memory, recognition and expression of emotion, and neglect.[3] Other frequently occurring, though slightly less common, deficits include reasoning and problem solving, awareness, and orientation.[3] It is also common for patients with right hemisphere damage to have a flat affect, lack of emotional expression, while speaking. Additionally, these patients commonly have difficulty recognizing other people's emotions when expressed through facial expressions and tone of voice.[2] Although these deficits alone may complicate therapy, the patient may also exhibit anosognosia, or ignorance of his or her impairments.[4][5] Due to possible anosognosia, it is common for patients to not become frustrated or upset when they are unable to complete tasks they were previously able to complete.[6]