Display dims in and out periodically

I was wondering if this is normal. The display screen will dim from light to dark, and then back to light again. I just recently purchased this MBP refurbished from apple last week. It's the early 2008 2.4 previous generation model.
Thank you

The MPB has ambient light sensors in the speaker grills that reduce display brightness in dim light. If your hands move over the grills while you are using the MBP, the sensors detect the reduction in ambient light and react accordingly.
If this bothers you, you can turn it off in System Preferences > Displays and unchecking the box that reads "Automatically adjust brightness as ambient light changes."

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