?url_ver=Z39.88-2004&rft_id=10.1037%2Fpag0000145&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Li%2C+Xuan&rft.aufirst=Xuan&rft.aulast=Li&rft.volume=32&rft.atitle=Practice+makes+it+better%3A+A+psychophysical+study+of+visual+perceptual+learning+and+its+transfer+effects+on+aging&rft.date=2017&rft.issue=1&rft.title=Psychology+and+Aging&rft.issn=1939-1498&rft.genre=article