1 In a group of 108 workers professionally exposed to low lead levels and in 35 shoe factory workers exposed to a mixture of solvents, neurotoxic effects were evaluated by means of Critical Flicker Frequency, used as single test of psychophysiological performance.
2 A statistically significant lowering of CFF threshold was observed and, in the lead exposed group, this decrease is related to the biological parameter zinc protoporphyrin.
3 The usefulness of CFF measure in environmental toxicology, together with other neurophysiological tests, is considered.
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