move involuntarily
move reflexively

In any case, Chapman did not move reflexively when Mays' pitch came his way.

As he reflexively moves his body to avoid dangers, the wheel rocks back and forth, heightening the sensation of reality.

The pilot stared straight ahead, hands and feet moving reflexively to keep the helicopter in level flight.

"Rise and shine," he said as he sat up, his right hand reflexively moving to rub the smooth top of his head.

Hubbard's hand moved reflexively to a small canister at his belt, but Beatriz stopped him.

They were nowhere close to the polish of the battlehardened legions who moved reflexively at the first flutter of notes.

Chekov's hands moved reflexively on the weapons console.

The lady doctor's lips moved reflexively in synchronization with the Fox's familiar Dowland song.

"She wasn't the sort to steal someone else's symbiont," Jadzia said carefully, her hand moving reflexively toward her abdomen.

His fingers moved reflexively toward a weapon and then slowed, reasoning that an assassin would not take the time to announce himself.