detrend

各位老师:
我在做静息态分析的时候有一步不是很清楚原理,请问去线性漂移“detrend”这一步的目的是 什么?为什么要做这一步?

Systematic signal increase or decrease occurs over time because of long-term physiological shifts, movement related noise remaining after realignment or instrumental instability (Lowe and Russell, 1999; Turner et al., 1997). The linear trend is usually removed in data preprocessing.