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A Flash Group Creation Algorithm for P300 Brain-Computer Interface Integration with Irregular Assistive Technology

Jane E Huggins^1,2, Palash Biswas³, James K Huggins⁴

¹Department of Physical Medicine and Rehabilitation, University of Michigan Medical School, Ann Arbor, MI 48109, USA.

Sensors (Basel, Switzerland)

|April 14, 2026

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This summary is machine-generated.

A novel Magic Square Paradigm (MSP) algorithm improves brain-computer interface (BCI) control for augmentative and alternative communication (AAC) keyboards. This method enhances communication access for individuals with severe motor impairments by optimizing stimulus presentation.

Area of Science:

Neuroscience
Computer Science
Rehabilitation Engineering

Background:

Event-related potential (ERP)-based brain-computer interfaces (BCIs), specifically P300 BCIs, are crucial for communication access in individuals with severe motor impairments.
Current BCIs face challenges in adapting to diverse grid layouts of augmentative and alternative communication (AAC) keyboards, affecting usability.

Purpose of the Study:

To develop and evaluate an algorithmic approach for creating effective flash groups for BCI control of dynamic AAC keyboards with irregular layouts.
To ensure BCI stimuli align with screens featuring varied key sizes and partial population, optimizing user interaction.

Main Methods:

Defined six design priorities for flash group creation: identifiability, unpredictability, perceptibility, minimality, anti-adjacency, and equality.

Keywords:

augmentative and alternative communication event-related potentials human–computer interface

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Developed the Magic Square Paradigm (MSP) algorithm, evaluating it on simulated and commercial AAC dynamic screens.

Analyzed generated flash groups for adherence to anti-adjacency and equality design priorities.

Main Results:

The MSP algorithm successfully generated flash groups for irregular AAC keyboard layouts, minimizing adjacency issues (0% side-by-side, 0.02% amalgamated, 6% diagonal).
The average difference in flash group size was minimal (1.9 keys), indicating efficiency.
126,944 flash groups were created for 5,778 selections on dynamic AAC screens.

Conclusions:

The Magic Square Paradigm (MSP) offers a novel and effective method for BCI control of dynamic AAC keyboards with complex, irregular layouts.
This approach enhances communication accessibility for users with severe motor impairments by optimizing BCI stimulus presentation.