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impact of frequency differences on amplitude modulation

July 28, 2022

if you combine two rhythms, what determines the resulting modulated signal? one aspect is the difference between the two frequencies, resulting in two spectral peaks left and right from the center frequency. pic.twitter.com/XrXoVb9ZlU

— Natalie Schaworonkow (@nschawor) July 28, 2022

Tags: peak-frequency, signal-processing, simulation

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oscillation baseline shift and 1/f-exponents

October 16, 2025

ok, imagine you have an oscillation that is not symmetric around 0 (small direct current shift) with some amplitude modulation, for instance with 1/f-dynamics. ➡️ then these 1/f-dynamics will show up in low frequency part of spectrum (red); in addition to around oscillation peak (yellow).

[image or embed]

— Natalie Schaworonkow (@nschawor.bsky.social) October 16, 2025 at 3:58 PM

beta as bursts / beta as a rhythm

June 06, 2024

"beta-activity as bursts", I am def 💯 OK with that.

but imho the pendulum has swung too far in the direction that all beta activity equals close to 1-2 cycle bursts. so just to illustrate diversity, here is some more sustained beta-activity, resting-state EEG.
〰️🙂〰️ pic.twitter.com/s9SnbdQy6j

— Natalie Schaworonkow (@nschawor) June 6, 2024

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© 2026 Natalie Schaworonkow. Adapted from Jekyll & AcademicPages, a fork of Minimal Mistakes.