Perhaps you should try some spelling variations:
multiuser processing » multi processing (Expand search), multirate processing (Expand search), multimedia processing (Expand search)
rats decreases » and decreases (Expand search), but decreases (Expand search), stress decreases (Expand search)
decrease rats » decreased rate (Expand search), decreases rate (Expand search), decrease at (Expand search)
decrease pain » decreases pain (Expand search), decrease in (Expand search), decreased brain (Expand search)
pain decrease » can decrease (Expand search), taping decrease (Expand search), strain decrease (Expand search)
decrease the » decreases the (Expand search), decrease in (Expand search), decrease of (Expand search)
the decrease » to decrease (Expand search), and decrease (Expand search)

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• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease rats decreases multiuser processing ) OR ( decrease pain decrease the decrease ))~".
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