diff --git a/frigate/api/review.py b/frigate/api/review.py
index 4170a1a91..937f7948d 100644
--- a/frigate/api/review.py
+++ b/frigate/api/review.py
@@ -404,6 +404,9 @@ def motion_activity():
 
     # normalize data
     df = df.resample(f"{scale}S").sum().fillna(0.0)
+    mean = df["motion"].mean()
+    std = df["motion"].std()
+    df["motion"] = (df["motion"] - mean) / std
     df["motion"] = (
         (df["motion"] - df["motion"].min())
         / (df["motion"].max() - df["motion"].min())