The Nest cam algorithm sends two different notification types: sensing motion or sensing a person.
In my scenario, one camera issues a “motion detected” notification when the headlights of a car that is turning the corner near my house crosses a window within the camera’s viewing area.
Currently, in the individual camera user interface where notifications are selected there are two types: sound and activity. I would suggest that the activity notification type be expanded to include both motion and person. This would result in three notification “About” items: sound, motion, individual/person.