Wireless eeg headphones for cognitive tracking and neurofeedback

A wearable biophysiological signal acquisition device comprising:

• at least one electrode for measuring electrophysiological activity,
• at least one reference electrode,
• at least one ground electrode, and
• an axle that presses the at least one electrode against skin around an ear of the wearer to permit electrophysiological activity of the wearer to be measured by the at least one electrode,
• wherein the measured electrophysiological activity is used to assess a mental state of the wearer.

A system comprising:

• a wearable biophysiological acquisition device comprising:
• at least one electrode for measuring electrophysiological activity,
• at least one reference electrode,
• at least one ground electrode, and
• an axle that presses the at least one electrode against skin around an ear of a wearer to permit electrophysiological activity of the wearer to be measured by the at least one electrode, and
• a mobile device for receiving biophysiological signals from the wearable biophysiological acquisition device,
• wherein system is operable to use the measured electrophysiological activity to access one or more mental states of the wearer.

The system of claim 99, wherein the system is operable to:

• provide a first stimulus to a wearer of the biophysiological signal acquisition device,
• acquire first biophysiological signals simultaneously with the provision of the first stimulus,
• use the first biophysiological signals to assess a first mental state of the user in response to the first stimulus,
• provide a second stimulus to the wearer of the biophysiological signal acquisition device,
• acquire second biophysiological signals simultaneously with the provision of the second stimulus, and
• use the second biophysiological signals to assess a second mental state of the user in response to the second stimulus.