Muscle (High-Frequency) Artifacts

Muscle metrics summarize high-frequency contamination and event-like bursts.

For execution steps, see Tutorial.

Subject-report muscle views

View	Encoding	What it reveals
Muscle overview	module status and summary context	whether muscle metric was computed and available
Muscle event summary	event counts / burden summaries	intensity of high-frequency contamination

1) Muscle overview

2) Muscle event panel

Interpretation:

• higher event counts/rates indicate stronger high-frequency artifact burden,

• clustered events suggest state- or task-specific muscle activation periods.

Muscle in QC summaries

• Subject QC summary -> Muscle: run-level compact QC tables.

• QC Group Muscle tab: event count, event rate, and GQI muscle component comparisons.

QC implications

• muscle burden is often complementary to PSD high-frequency patterns,

• evaluate event timing relative to task segments before exclusion,

• use with ECG/EOG/STD/PtP for multi-factor decisions.

Muscle artifacts appear in the high-frequency range (typically 110-140 Hz) and are detected as discrete events. The event count and rate provide quantitative measures for comparing across subjects and sessions.