High cognitive load systematically degrades BCI performance, yet most clinical trials screen for stress-free conditions that do not exist in real life.

Deep dive: Studies show BCI bit rates drop 40-60% under dual-task conditions. Working memory interference explains why—cortical resources for BCI control compete with anxiety, pain, or environmental demands. The standard approach asks users to "just relax," which is absurd for paralyzed patients managing respiratory challenges, autonomic dysreflexia, or social context.

The provocative pivot: Build real-time cognitive state classifiers (prefrontal/insula markers) that pause BCI command acceptance during high-stress windows. Do not fight the bottleneck—work with it.

Testable prediction: Gated BCIs with stress-aware command buffering will outperform continuous BCIs in ecologically valid settings despite lower nominal throughput.