RECOGNITION TIME OF ROTATED PICTOGRAPHIC SYMBOLS FOR AUTOMOBILE CONTROLS

A laboratory experiment was conducted to examine certain aspects of the recognition problem when the knob on which the pictogram appears is rotated. Ten subjects made timed same-different responses to three pairs of standard control symbols differing in orientation. The time required for mental rotation for all symbols was found to be a linear function of angle. The mean rate of rotation was 130 degrees per second. Since the expected time for this added mental operation is nontrivial, the time available to survey the road ahead is reduced. Consequently, the probability of missing an accident-generating hazard is increased. It is therefore suggested that the symbol standards be modified to require symbols to be displayed only in their perceptually upright positions.

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  • Corporate Authors:

    National Safety Council

    425 North Michigan Avenue
    Chicago, IL  USA  60611
  • Authors:
    • Green, P
    • Davis, G
  • Publication Date: 1976-12

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00164958
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Files: TRIS
  • Created Date: May 18 1978 12:00AM