What do you see in the picture below?
When you first look at this picture, do you immediately see a white vase? Or do you see two faces in profile? This optical illusion contains both. Most people can ultimately see both images and can switch back and forth between perceiving one and the other.
This illusion is interesting because it shows that perception is not solely determined by an image. Here, the brain has to distinguish between object and background, which varies depending on which you perceive as the object and which you perceive as the background.
This puzzle is provided by Posit Science. For more information on Posit Science and brain fitness, visit http://positscience.com.Count the black dots within the square below.
Does it seem impossible? Well, it is. Truth be told, there are no black dots. Each time you focus your eyes, you see that the dots you're looking directly at are all actually white. The surrounding ones just appear to be black.
Your brain's vision system naturally processes edges of objects so they are enhanced. Seeing edges clearly is important for your brain to understand and define an image. This can sometimes result in visual "artifacts" away from the center of the receptive field, such as the black dots in the Hermann grid above.
This puzzle is provided by Posit Science. For more information on Posit Science and brain fitness, visit http://positscience.com.Count the "f"s in this passage:
How many did you count?
There are 6 "f"s in this passage. If you only counted 3, you're not alone. Most people fail to count the "f's" in the word of. Why? When looking for "f's" your brain is actually scanning for the sound of the letter "f" – which usually makes the /f/ sound, like in fox. In the word of, though, "f" makes the /v/ sound. As a result, the brain overlooks the word of as it scans for the sound of /f/.
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