A client device is configured with a test administration application for conducting self-administered tests. The user interface of the test administration application includes motion restriction regions for restricting certain body parts from moving or certain body motions during the entire or particular segments of self-administered tests. Only target response motions in a test are captured and analyzed. Undesired motions that may interfere with assessment of users' cognitive and/or motor skills are reduced or excluded. When users' hands are anchored to the device, they will have limited ability to invalidate test results, for example by taking notes or hovering hands over regions of interest in spatial recall tasks. Task administration systems provide improvements in the accuracy and reliability of tests of neurological, cognitive, and motor skills, by ensuring that user inputs to such tests are valid inputs, etc.