International Journal of Alzheimer’s Disease / 2011 / Article / Tab 1

Research Article

Slowing and Loss of Complexity in Alzheimer's EEG: Two Sides of the Same Coin?

Table 1

Overview of statistical measures: relative power, Lempel-Ziv complexity, and lossless compression ratio.

Measure Description References

Relative powerPower within specific EEG frequency band normalized by total power[12]
Frequency bands: 0.5–4 Hz (delta), 4–8 Hz (theta), 8–10 Hz (alpha 1), 10–12 Hz (alpha 2), 12–30 Hz (beta)
Lempel-Ziv complexityNumber of different patterns present in an EEG signal (complexity measure)[13]
Lossless compression ratioReduction of the size of EEG data after lossless compression (regularity measure)[14, 15]
Compression algorithms considered here: 1D SPIHT, 2D SPIHT, and 2D SPIHT followed by arithmetic coding

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