University of Utah engineers designed a new kind of video game controller that not only vibrates like existing devices, but pulls and stretches the thumb tips in different directions to simulate the tug¹ of a fishing line, the recoil²（畏缩，弹回） of a gun or the feeling of ocean waves. "I'm hoping we can get this into production when the next game consoles come out in a couple of years," says William Provancher, an associate professor of mechanical engineering who is in Vancouver, British Columbia, demonstrating the new game controller with his students March 5-7.

They are demonstrating the device and presenting studies about it during the Institute of Electrical and Electronics Engineers' Haptics Symposium³. Haptics deals with research about touch, just as optics（光学） deals with vision. A patent is pending⁴ on the device.

The first haptic（触觉的） or touch feedback in game controllers came in 1997 with the Nintendo64 system's "rumble⁵ pack" that makes the hands vibrate using an off-balance motor to simulate the feel of driving a race car on a gravel⁶ road（碎石路） , flying a jet or dueling⁷ with Star Wars light sabers（军刀，佩剑） , Provancher and colleagues write.

His new controller does something additional: it delivers directional cues to the player by stretching the skin of the thumb tips in different directions.

"We have developed feedback modes that enhance immersiveness and realism for gaming scenarios⁸ such as collision, recoil from a gun, the feeling of being pushed by ocean waves or crawling prone⁹ in a first-person shooter game," Provancher says.

The latest game controller prototype looks like controllers for Microsoft's Xbox or Sony's PlayStation but with an addition to the controller's normal thumb joysticks, on which the thumbs are placed and moved in different directions to control the game. In the new controller, the middle of each ring-shaped thumb stick has a round, red "tactor" that looks like the eraser-head-shaped IBM TrackPoint or pointing stick now found on a number of laptop computer brands.

If a gamer's avatar runs into a wall, the tactor under the thumb moves back to mimic¹⁰ impact. Both tactors can move from side to side to mimic ocean waves. And when a fish bites in one of the games the researchers tried, "as the fish jerks on the line, you can feel the tactor（触器） jerk under your thumb," Provancher says.

Video games commonly are designed so the left thumb stick controls motion and the right controls the player's gaze or aim. With the new controller, as a soldier avatar crawls forward, the player pushes the left thumb stick forward and feels the tactors tugging¹¹ alternately back and forth¹² under both thumbs, mimicking¹³ the soldier crawling first with one arm, then the other.

Provancher also hopes to adapt the new game controller design for use as a smart phone peripheral¹⁴（外围的） device. A phone would fit into the device with game-controlling thumb sticks and tactors on each side of the phone.