Portable brain activity sensing platform for visual field defect assessment

Portable brain activity sensing platform for visual field defect assessment

  • CN 106,455,968 B
  • Filed: 04/17/2015
  • Issued: 08/17/2021
  • Est. Priority Date: 04/17/2014
  • Status: Active Grant
First Claim
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1. A portable head-mounted display system for monitoring brain activity associated with a user'"'"'s field of view, comprising:

  • a sensor unit for acquiring electroencephalographic signals, the sensor unit including one or more electrodes attached to a housing wearable on the head of the user;

    an electro-oculogram unit including one or more electrodes disposed near a lateral canthus of each eye of the user to identify a loss of fixation condition based on monitoring changes in an electric field associated with movement of the user'"'"'s eyes using the one or more electrodes of the electro-oculogram unit;

    a visual display unit attached to the housing for fixation to the user'"'"'s head and comprising a display screen presenting at least one visual stimulus in a sector of the user'"'"'s field of view, wherein the visual stimulus is mapped to a spatial location of a visual stimulus display, wherein the visual stimulus comprises a light flickering effect that blinks at a selected frequency that evokes a corresponding multifocal steady-state visual evoked potential in the electroencephalographic signal exhibited by the user acquired by the sensor unit, and wherein the visual display unit provides full eye coverage for assessing the user'"'"'s field of view; and

    a data processing unit in communication with the sensor unit, the electro-oculogram unit, and the visual display unit, wherein the data processing unit is configured to;

    (i) at least one visual stimulus is generated in the form of,(ii) to analyze electroencephalographic signals acquired by one or more electrodes of the sensor unit,(iii) generating a second set of electroencephalogram signals by removing unreliable signals corresponding to a loss of fixation from the acquired electroencephalogram signals based on the output of the electrooculogram unit, an(iv) Processing the second set of electroencephalogram signals to generate the assessment of the user'"'"'s field of view.

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