@article{ref1,
title="Effects of age, presentation speed, and sensory modality on performance of a "vigilance" task",
journal="Journal of gerontology",
year="1963",
author="Thompson, L. W. and Opton, E. Jr and Cohen, L. D.",
volume="18",
number="",
pages="366-369",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0022-1422",
doi="",
url="http://dx.doi.org/"
}