Perhaps you should try some spelling variations:
decreases aggression » decreases expression (Expand search), decrease aggressive (Expand search), increased aggression (Expand search)
aggression decrease » expression decreases (Expand search), aggression case (Expand search), aggression depression (Expand search)
fear processing » pear processing (Expand search), fur processing (Expand search), after processing (Expand search)
decrease fear » decreased fear (Expand search), decrease fetal (Expand search), decreased heart (Expand search)
to decreases » to decrease (Expand search), to decreased (Expand search), co2 decreases (Expand search)
decrease β » decrease _ (Expand search), decrease in (Expand search), decrease of (Expand search)
β decrease » _ decrease (Expand search), α decrease (Expand search), l decrease (Expand search)
decrease to » decreased to (Expand search), decrease toc (Expand search), decrease the (Expand search)

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease β decrease fear processing ) OR ( decrease to decreases aggression decrease ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease β decrease fear processing ) OR ( decrease to decreases aggression decrease ))*.