1.   Besides acting to strengthen a response, each reinforcement gives the animal information about which behavior is being reinforced.

2.   His statement eclipsed hints by other Japanese officials that Japan might act to strengthen the yen if it continues to fall.

3.   Physical touch, new sights and sounds, food and praise may act to strengthen any behavior associated with them.

4.   The researchers noted that earlier studies had linked stroke to infection, and suggested that the flu vaccine might act to strengthen the overall immune system.

5.   We have it in our power, if we act unwisely, to strengthen the very forces we are most frightened of.

6.   In Paris, an analyst at Smith Barney, Jean-Baptiste Pons, shared the view that the Verona meeting had acted to strengthen the franc.