Perhaps you should try some spelling variations:
depressed chemical » depressed medical (Expand search), increased chemical (Expand search), repeated chemical (Expand search)
chemical processes » chemical properties (Expand search)
during depressed » during depressive (Expand search), during repressive (Expand search), feeling depressed (Expand search)
decrease during » increase during (Expand search), increases during (Expand search), increased during (Expand search)
decrease of » decrease in (Expand search)
of decrease » or decrease (Expand search), not decrease (Expand search), to decrease (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 during depressed chemical processes ) OR ( decrease of decrease _ decrease ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease during depressed chemical processes ) OR ( decrease of decrease _ decrease ))*.