Neurogenesis appears to slow in old age, perhaps explaining why the elderly have trouble telling a new but similar image (outlined in green) from a previously seen version. In one study (graph), older adults were more likely to label such images as "old," thinking they'd been seen before, while the young correctly pegged the images as "similar."
Credit: Photos: 30000euro/istockphoto; sphotos/istockphoto; 30000euro/istockphoto; elenathewise/istockphoto; albertsmirnov/istockphoto; Abhijit Tembhekar/Wikimedia Commons; Graph: Source: Michael A. Yassa et al/Hippocampus 2010, adapted by E. Feliciano
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Three-part series on the scientific struggle to explain the conscious self
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By Leila Schneps and Coralie Colmez
Review by Janet Raloff
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