[Mental evaluation after chronic exposure to tetrachloroethylene]

With the aim of determining the effects of chronic occupational exposure to Per upon the selected intellectual and psychomotor functions two groups of workers have been examined. The proper group was that of chemical laundry workers exposed to Per (concentrations within TLVs and above). The control group was composed of knitting plant workers nonexposed to chemical substances. The findings point to significant differences between the test groups, consisting in an extension of the time of response to homogeneous and complex light stimuli (psychomotor function) and in a decrease in the ability to see and reflect the visual material (intellectual function) in the Per-exposed group.