Centerline Regime

What is a Centerline Regime?

A centerline regime is a read of which side of its midline an oscillator occupies: above the centerline is treated as a bullish regime, below as bearish, independent of any overbought or oversold extreme. The midline is 50 for 0-to-100 oscillators like RSI and stochastics, and zero for zero-centered ones like MACD, ROC, and TSI. The level usually has structural meaning: MACD at zero means the fast EMA equals the slow one, ROC at zero means price is flat against its lookback, RSI at 50 means average gains equal average losses.

The regime framing exists because trending markets break the classic overbought/oversold playbook: in a sustained uptrend an oscillator spends most of its time on the upper side, tags overbought repeatedly, and rarely reaches oversold. Which side of the midline the oscillator lives on, and which extremes it actually reaches, then carry more information than any single extreme reading. Constance Brown's RSI range rules formalize the same observation into shifted bull and bear ranges.

How traders use it

• As a trade filter: longs only while the oscillator holds above its midline (RSI above 50, MACD above zero), shorts only below, a cheap regime gate layered onto other entries.
• As threshold context: which overbought and oversold levels matter depends on the regime side, since bull regimes routinely reach overbought while pullbacks stall near the midline instead of reaching oversold.
• As a retest level: oscillator pullbacks that hold at the midline and turn are read as momentum-side confirmation that the regime is intact, a common continuation cue.