At any time the load factor drops below 1G, the apparent weight of the aircraft is also reduced, and therefore the lift requirement and VS are reduced accordingly.
Well, considered slightly differently, when "the pilot reduces the load factor below 1G".... With all the appropriate cautions and preparations for conducting practice stalls, when just at the point of the stall breaking, and with an eye on the indicated airspeed, push a bit more than you would normally to recover the stall. You will, of couse, experience less than 1G. You may also notice an indicated airspeed somewhat lower than you were expecting to see. There are several factors which will affect the accuracy of the airspeed indication, but you should see the effect. If not, try it in a bit of a climb with some power on, and leave the power on, as you go over.