When configuring Motiva Message Testing AI, there's an option called Confidence Threshold.
If the confidence of a particular variation reaches the confidence threshold, Motiva will automatically invest all future sends in that “winner” and stop sending other variations.
The default confidence threshold is fairly high at 95%, but if you prefer, you can select a lower value, either 90% or 85%, or you can also select a higher value of 99%.
With a higher value, you can be more confident in the "winner", but it will take longer to find.
Also see Confidence.