Covert visuospatial attention orienting in a brain-computer interface for amyotrophic lateral sclerosis patients

Area of Science:

• Neuroscience
• Biomedical Engineering
• Rehabilitation Technology

Background:

• Brain-computer interfaces (BCIs) offer communication and motor control solutions for amyotrophic lateral sclerosis (ALS) patients.
• Current BCIs often require eye movements, limiting use in advanced ALS stages.
• Covert visuospatial attention (VAO) presents an alternative control mechanism, bypassing the need for ocular movements.

Purpose of the Study:

• To enhance visual interfaces for ALS patients controlling cursors via covert VAO.
• To investigate the efficacy of exogenous versus endogenous VAO in BCI control for ALS patients.

Main Methods:

• Ten ALS patients with varying impairment levels participated.
• Two event-related potential (ERP)-based BCI visual interfaces were tested.
• Participants utilized exogenous VAO in the first interface and endogenous VAO in the second.

Main Results:

• ALS patients successfully controlled the ERP-based BCI system in real-time using both interfaces.
• The endogenous VAO interface yielded significantly better target classification and information transfer rates.
• Covert VAO proved a viable control strategy for ALS patients.

Conclusions:

• ALS patients can leverage covert VAO for eye-movement-free BCI control.
• Endogenous VAO-based interfaces are promising for developing more efficient and ergonomic BCIs for ALS.
• This approach benefits ALS patients with severe motor and eye movement impairments.