📋 Speller Matrix — click a letter to set target
🎮 Controls
Speed:Normal
Sequences:8
📊 Status
Target— click a letter
Sequence0 / 0
Current Flash—
Detected Letter—
ℹ️ P300 Principle
The P300 is a positive EEG peak ~300 ms after a rare, attended stimulus (oddball paradigm). Rows & columns flash randomly. When the target letter's row or column flashes, your brain generates a P300. Averaging multiple epochs lets the BCI identify which row & column produced the peak — decoding the intended letter.
⚡ Current Epoch — Single-trial EEG
Non-target flash
Target flash (P300)
📊 P300 Amplitude per Row / Column
🔁 Averaged ERP — accumulates over sequences
Target Row avg
Target Column avg
Non-target avg