Provides essential updates to the clinical material in a size amenable to reading and referencing. The Essentials contains 20 key chapters from the textbook from the following sections: Assessment - bedside, neuropsychological functioning, clinical and functional imaging; Symptomatologies - delirium, aphasia, amnesia; Disorders -traumatic brain injury, seizure disorders, sleep disorders, cerebrovascular, brain tumors, poisons and toxins, chemical dependencies, dementia, schizophrenia, mood and affective disorders, anxiety, and disorders of childhood and adolescence; and Treatments -psychopharmacology, cognitive-behavior therapy.