Automobile accident probability rises with any measurable blood alcohol; yet neither compensatory tracking nor visual search-and-recognition, the major component of the driving task, is impaired by moderate levels of alcohol. The paper presents evidence that the ability to time-share and process information from two or more sources is impaired by alcohol. This ability, essential to the dual component driving task, is suggested as the site of alcohol-induced decrements. Similar analyses of marihuana effects have been performed. In contrast to alcohol effects, performance decrements occurred for perceptual tasks under concentrated attention as well as under divided attention. Marihuana-induced perceptual deficits appear not to be dependent upon division of attention. However, it does not appear that marihuana affects sensory processes directly. A series of tests of simple visual functions failed to reveal any differences between the effects of marihuana and alcohol. It is hypothesized that marihuana may produce brief drop-outs of attention. The nature of the alcohol deficit in performance is related to information processing asnd division of attention, crucial aspects of driving. The nature of the marihuana deficit in performance does not appear as directly linked to the performance requirements of driving. /Author/

  • Corporate Authors:

    Georg Thieme Verlag

    Herdweg 63, Postfach 732
    7 Stuttgart,   Germany 
  • Authors:
    • Mosdkowitz, H
  • Publication Date: 1973

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00084397
  • Record Type: Publication
  • Source Agency: National Safety Council Safety Research Info Serv
  • Files: TRIS
  • Created Date: Jul 2 1975 12:00AM