Perhaps you should try some spelling variations:
rats decreases » and decreases (Expand search), but decreases (Expand search), stress decreases (Expand search)
decrease focal » decreases local (Expand search), decrease fetal (Expand search), decrease total (Expand search)
decrease rats » decreased rate (Expand search), decreases rate (Expand search), decrease at (Expand search)
focal objects » social objects (Expand search), local object (Expand search), real objects (Expand search)
decrease or » decrease of (Expand search), decrease on (Expand search), decrease pro (Expand search)
or decrease » of decrease (Expand search), not decrease (Expand search), to decrease (Expand search)

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (( decrease rats decreases _ decrease ) OR ( decrease OR decrease focal objects ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease rats decreases _ decrease ) OR ( decrease or decrease focal objects ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease rats decreases _ decrease ) OR ( decrease or decrease focal objects ))*.