Have you ever wondered why you can perceive two or more objects by only seeing one picture? Seems ambiguous right? Just like the picture in the right part of your screen. You may interpret the woman to be old or young. You might be wondering why your visual perception is unstable, perceiving alternating images of a young and an old woman especially when you’ve been exposed to it for a long time.
The mechanisms essential to spontaneous perceptual reversals is still debatable even if it has been studied for more than 200 years already. However, I found a study that that shows how reliability affects interpretation. Two groups of males and females took part in the experiment of Kornmeier and Bach. One group of nine women and five men were assigned to the lattice experiment and a group of eight women and five men were assigned to the face experiment. Geometric stimuli and face stimuli were presented to the participants with two unambiguous variants. The slides were flashed to the participants while the EEG measures their brain activities. The experimenters used MANOVA to interpret their data.
Through the experiment conducted by Kornmeier and Bach, we better understood that the more reliable our percept is rated, the faster and more accurate our action will be. On the other hand, if we’re unsure of our percept, we move slower and we’re more prone to errors.
Now, we know what to do if we’d want to move efficiently and decide quickly. We must then familiarize ourselves first with our task. If our visual perception is not taking second looks, it also helps our brain to be sure of what we’re doing.
Kornmeier, J. & Bach, M.(2009). Object perception: When our brain is impressed but we do not notice it. Journal of Vision January 12, 2009 vol. 9 no. 1 article 7. Retrieved from http://www.journalofvision.org/content/9/1/7.full
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