Periodic motion-based visual stimulus

A method comprising:

• at a computer device having a processor and a sensor system configured to be mounted adjacent to a user's head and to measure an electrical potential near one or more electrodes of the sensor system:
• presenting a periodic motion-based visual stimulus having a changing motion that is frequency-modulated for a target frequency or code-modulated for a target code via a display device of the computer device;
• detecting changes in the electrical potential via the one or more electrodes;
• identifying a corresponding visual evoked potential feature in the detected changes in the electrical potential that corresponds to the periodic motion-based visual stimulus;
• and
• recognizing a user input to the computing device based on identifying the corresponding visual evoked potential feature.

A computer device comprising:

• a display device;
• a sensor system configured to be mounted adjacent a user's head and to measure an electrical potential near one or more electrodes of the sensor system;
• and
• a processor configured to:
• present a plurality of interface elements via the display device;
• present a plurality of periodic motion-based visual stimuli, each periodic motion-based visual stimulus being associated with respective interface elements of the plurality of interface elements;
• detect changes in the electrical potential via the one or more electrodes;
• determine that the user is attending to a user attended periodic motion-based visual stimulus from among the plurality of periodic motion-based visual stimuli based on identifying a corresponding visual evoked potential feature in the detected changes in the electrical potential that corresponds to the user attended periodic motion-based visual stimulus;
• and
• recognize a user input directed at an interface element that is associated with the user attended periodic motion-based visual stimulus.