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Is a Laptop Touchpad Heat Sensitive?

My MacBook Pro display automatically reduces brightness before I finish reading one page, sometimes it returns to its full brightness or even wakes up from sleep before my finger touch the touchpad, i. e. it can sense my "touching" even when it was a couple millimetres above.

I wonder if the touchpad is heat sensitive. In an Answerbag post How does a laptop touch pad work?, I learned that "laptop mouse touchpad usually use heat to detect touch. "

But some say on a macbook it's not heat, it's conductivity. One guy tested a cold sterling silver ring, it works perfectly even when not in contact with his body. A 50 cent euro coin works, but a stainless steel Ikea fork does not - even if he warm it up and/or hold the fork. But I tried a sterling coin and failed. I couldn't move the mouse by a Pound Sterling.

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Touchpad said…
A touch pad is a device for pointing (controlling input positioning) on a computer display screen. It is an alternative to the mouse. Originally incorporated in laptop computers, touch pads are also being made for use with desktop computers. A touch pad works by sensing the user's finger movement and downward pressure.

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