Frederick H T Cheng

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We examined visual selective attention under perceptual load--simultaneous presentation of task-relevant and -irrelevant information--in healthy young and older adult human participants to determine whether age differences are observable at early stages of selection in the visual cortices. Participants viewed 50/50 superimposed face/place images and judged(More)
OBJECTIVE To compare the prevalence of spinal abnormalities found on magnetic resonance imaging (MRI) in symptomatic surgical candidates and non-surgical patients. DESIGN Retrospective cohort study. SETTING A single academic spine surgery practice in Toronto, Ont. PARTICIPANTS A total of 1586 symptomatic patients referred during a 32-month period;(More)
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