Pink passages: Add visceral reactions — physical involuntary reactions — to heighten connection with reader... but not too much. (ljagilamplighter.com)
It's an involuntary reaction that I wouldn't have been able to stop if my life depended on it. (wehavekids.com)
Dogs kick their legs when you hit that sweet spot due to something known as the scratch reflex, an involuntary reaction. (dogingtonpost.com)