Longitudinal changes in critical flicker fusion frequency : an indicator of human workload

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      <subfield code="a">Longitudinal changes in critical flicker fusion frequency</subfield>
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      <subfield code="a">The aim of this is to verify a hypothesis that critical flicker fusion frequency (CFFF) is season-related because of changes in the intensity and duration of sunlight. CFFF has a wide application in different fields, generally as an indicator of human workload. Therefore, confirmation of previous observations that CFFF is subjecto to a seasonal rhythm could make theoretical as well as practical sense</subfield>
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      <subfield code="g">Vol. 48, nº 15, 15 December 2005 ; p. 1770-1792</subfield>
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