Macbook Pro start up display glitch?

Today I noticed that whenever I turn my Macbook Pro on, strange visuals appear on the screen (see image). It only occurs for a split second, after the Apple loading screen, then disappears. After start up, I have not noticed anything different in OSX or with my hardware (sounds, display, etc.) My Macbook Pro is the 15-inch, Late 2011, 2.4GHz model. I do have Windows 8 installed through bootcamp, but I doubt it is related to this.
What would be the cause of this? And should it be of any concern?

Your model is known to have issues with the discrete nVidea GPU. Looks like a GPU related issue, and yes, it is of concern. The GPU is soldered to your logic board. If this is the problem ,  your logic board will need to be replaced. Without Applecare, this will cost you 750-900$.
Run the Apple Hardware test, extended, 3 times back to back. This will take a while to run. Disconnect peripheral devices and plug your machine into your magsafe. This will reliably test your logicboard and pinpoint the issue. If an error comes up, you will need to take your machine in for servicing or considering buying a new Macbook.
Using Apple Hardware Test - Support - Apple
2011 MacBook Pro and Discrete Graphics...: Apple Support Commu

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