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Olfactory event-related potentials obtained from 12 younger (mean age: 24 years) and 12 older (mean age: 71 years) subjects using normal breathing or breathing after being trained to close the palate to minimize airflow from the mouth (velopharyngeal closure). Note the smaller amplitude and longer latency responses in the older group. From Thesen and Murphy (2001), with permission. Copyright©2001, Elsevier Science B.V.
