Neural Control: Three Digestive Phases
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State
Digestion runs through three neural phases: cephalic, beginning before food arrives, triggered by sight or smell; gastric, beginning once food enters the stomach; and intestinal, beginning once chyme reaches the intestine.
Show
Thinking about a favorite food can trigger cephalic-phase salivation before any food is present.
Watch for
All three phases overlap — the gastric phase builds on cephalic stimulation rather than starting fresh.