The South Texas Assessment of Neurocognition (STAN) is a 90-min primarily computerized battery of standard and experimental neuropsychological tests. The STAN combines software developed for psychological experimentation (E-Prime) and database software (Microsoft ACCESS) with a user interface developed in visual basic to provide a fully automated testing environment which logs subject information, administers tests in a pre-defined order and databases subject performance at the completion of each test. The trait is EFO_0004785 (South Texas Assessment of Neurocognition).