It's normal.
The Nikon dSLRs have various LCD display modes, and one of them is called "highlight clipping warning display". Basically, when you set your LCD display to "highlight clipping warning display"(it's the mode right before the "histogram display"), it blinks white/black wherever your picture has blown highlights (i.e. where your picture is overexposed)
A histogram display is very helpful in telling whether you've got the
exposure right, but to it isn't adequate by itself. With digital
cameras, it's very important not to blow-out the highlights in a
picture (they're similar to color positive film in that respect), since
once you hit the maximum brightness, the image just saturates, and any
highlight detail will be lost. A histogram display does a pretty good
job of telling you how the image as a whole is doing, but what if there
are just a few critical areas that you're worried about for the
highlights? If only a small percentage of the total frame is involved,
it won't account for many pixels. That means any peak at the "white"
end of the histogram graph would be pretty small, and easy to miss (or
just plain invisible). What to do? The folks at Nikon recognized this
problem some time ago, and so have provided another special display
mode on the D60 (as on most of their dSLRs) that they simply call
"highlights," accessible via the Playback settings menu, under "Display
Mode." This mode blinks any highlights that are saturated in any of the
color channels. It does this by taking the nearly-white areas on the
LCD and toggling them between white and black.
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