Perhaps you should try some spelling variations:
increased signal » increased spinal (Expand search), increased airway (Expand search), increased atrial (Expand search)
decrease faster » decrease after (Expand search), decrease further (Expand search), decreased after (Expand search)
faster decrease » rate decrease (Expand search)
and increased » and increases (Expand search)
decrease and » decreases and (Expand search), decrease in (Expand search), decrease of (Expand search)
decrease at » decrease akt (Expand search), decrease in (Expand search), decrease of (Expand search)
at decrease » rate decrease (Expand search), that decrease (Expand search), and 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 AND increased signal processing ) OR ( decrease at decrease faster decrease ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease and increased signal processing ) OR ( decrease at decrease faster decrease ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease and increased signal processing ) OR ( decrease at decrease faster decrease ))*.