📊 Metrics Explanation

Cognitive Metrics (from EEGMetricsCalculator)

Focus
β / (β + θ)
Ratio of Beta to (Beta + Theta). Higher values indicate more focused/active thinking.
Range: 0-1 (0-100% when scaled)
Calm
α / (α + β + γ)
Ratio of Alpha to (Alpha + Beta + Gamma). Higher values indicate more relaxed/calm state.
Range: 0-1 (0-100% when scaled)
Engagement
β / (α + θ)
Ratio of Beta to (Alpha + Theta). Higher values indicate more cognitive engagement.
Range: 0-1 (0-100% when scaled)
Attention
β / α
Ratio of Beta to Alpha. Higher values indicate more attentive/alert state.
Range: 0-1 (0-100% when scaled)
Cognitive Load
θ / (θ + α)
Ratio of Theta to (Theta + Alpha). Higher values indicate higher mental effort/strain.
Range: 0-1 (0-100% when scaled)
Wandering
θ / β
Ratio of Theta to Beta. Higher values indicate more mind-wandering/distracted state.
Range: 0-1 (0-100% when scaled)

Brainwave Frequency Bands

Delta
0.5-4 Hz
Deep sleep, unconscious states. Sum of AF7 + AF8 channels.
Theta
4-8 Hz
Drowsiness, meditation, memory processing. Sum of AF7 + AF8 channels.
Alpha
8-12 Hz
Relaxed wakefulness, eyes closed. Sum of AF7 + AF8 channels.
Beta
12-30 Hz
Active thinking, concentration, alertness. Sum of AF7 + AF8 channels.
Gamma
30-100 Hz
High-level cognitive processing, binding. Sum of AF7 + AF8 channels.

Multimodal Neurofeedback Metrics

Engagement Index (EI)
(β_AF7 + β_AF8) / (α_AF7 + α_AF8 + θ_AF7 + θ_AF8)
Active thinking vs idle/struggle states. Higher = more engaged.
Range: 0-1
EEG Disengagement
(α_sum + θ_sum - 0.5 × β_sum) / (α_sum + θ_sum + β_sum)
EEG component of disengagement/fatigue. Higher = more disengaged (more Alpha/Theta relative to Beta). Used in DFI calculation (60% weight).
Range: 0-1
Disengagement/Fatigue Index (DFI)
0.6 × EEG_Disengagement + 0.4 × Blink_Rate_Excess
Combines EEG disengagement (60%) and blink rate excess (40%). Higher = more fatigued/disengaged.
Range: 0-1
Multimodal Cognitive State Index (MCSI)
(EI - DFI + 1) / 2
Overall cognitive engagement state. Higher = more engaged.
Range: 0-1
Interpretation:
• 0.7-1.0: Highly engaged
• 0.5-0.7: Moderately engaged
• 0.3-0.5: Low engagement
• 0.0-0.3: Disengaged/fatigued

Physiological Metrics

BPM (Beats Per Minute)
Heart rate from PPG (photoplethysmography). Calculated from infrared/red light sensors.
Typical range: 60-100 BPM (resting)
Blink Rate
Blinks per minute. Calculated from artifact detection.
Typical range: 15-20 blinks/min (normal). Higher = possible fatigue or dry eyes.
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EEG & Cognitive Metrics

Upload CSV with brain data
Metrics included:
- Focus, Calm, Engagement, Cognitiveload
- Attention, Wandering
- Delta, Theta, Alpha, Beta, Gamma (EEG)
- Blink Rate, BPM, EngagementIndex
- DisengagementFatigueIndex, BlinkRate

CSV should contain Timestamp and all metrics.
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