Concept taken from RSI : The Complete Guide by John Hayden 2:1 momentum is associated with RSI values of 66.67 and 33.33 respectfully. In an Uptrend an RSI value of 40 should not be broken and in a downtrend a RSI value of 60 should not be exceeded. If so, then there is buying/selling pressure in the opposite direction (but not necessarily enough for a trend reversal). Alternatively it may show the presence of HTF traders. 4:1 momentum (RSI values of 80/20) can be associated with extreme market conditions, typically thought of as being Overbought or Oversold.
This script shows three market states based on RSI 1. Trend State - Triggered by RSI breaking a 2:1 momentum level 2. Trend Momentum - When RSI is above/below a 2:1 momentum level 3. Overbought/Oversold - When RSI is above a 4:1 momentum level