Those with pain lacked this visual feedback system, and showed no activity in the sensory or motor cortex.

感觉到疼痛的人却没有这样的视觉回馈系统，而且在感觉和运动皮层都没有活动。

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Feedback, which one-way communication like the printed page fails to provide, makes learning easy and, in the case of motor skills, is essential.

反馈能使学习变得方便，而象印刷品之类的单向信息传递就没有反馈。在学习驾驶摩托车时，反馈更必不可少。

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A kind of the pulse control mode, the drive and motor closed loop, but not to the numerical control system, the feedback device, in a sense, can open loop control called the servo control.

一种采用脉冲控制方式，此种驱动器与电机闭环，但不反馈到数控系统，这种驱动器在某种程度上可称为开环控制的伺服控制。

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The capacitive buttons are ultra-responsive like the ones we experienced on the older Focus models, and the device's vibration motor left us with unquestionably better haptic feedback than the Lumia 900.

ENGADGET: Samsung Focus 2 review Mobile

The PR1, for instance, had a motor from an Aura Interactor embedded on the back, but Luckey found the force feedback too painful, and didn't carry the tweak over to future models.

ENGADGET: Oculus' Palmer Luckey and Nate Mitchell on the past, present and future of the Rift