Category Archives: reflex

Instagram Post – 5/25/2013

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Changes in pupil size are often thought of as a kind of #reflex, being driven automatically by changes in #luminance. This works shows clearly how even such automatic behaviors are shaped by experience: looking at a picture of the sun – that is DARKER than the preceding image – causes pupil constriction, while equally bright images (of the moon, of pure grey, or of a scrambled sun image) cause the “expected” pupil dilation (due to luminance decrease). #science #neuroscience