time-frequency analysis
Signal processing method that simultaneously analyzes how frequency content of neural signals changes over time.
Full Definition
Time-frequency analysis is a sophisticated signal processing technique used in neurophysiology to examine how the frequency content of neural signals evolves over time. Unlike traditional spectral analysis which provides frequency information averaged over the entire recording period, time-frequency methods such as wavelet transforms, short-time Fourier transforms, and spectrograms reveal dynamic changes in oscillatory activity. This analysis is particularly valuable for studying transient events like seizures, sleep spindles, or task-related brain responses, where frequency content changes rapidly. The technique produces time-frequency plots that show both when specific frequencies occur and their relative power, providing insights into the temporal dynamics of brain oscillations.
Usage
Usage note: Hyphenate when used as compound adjective; separate when used as noun phrase.
In Context
- "Time-frequency analysis revealed transient gamma oscillations during the cognitive task." — Research neurophysiology report
- "Wavelet-based time-frequency analysis detected brief high-frequency bursts preceding seizure onset." — Seizure analysis study