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Assessment of the broca-sulzer phenomenon via inter- and intra-modality matching procedures : studies of signal-light brightness.
  • Published Date:
    1968-10-01
  • Language:
    English
Filetype[PDF-423.99 KB]


Details:
  • Publication/ Report Number:
    AM 68-27 ; DOT/FAA/AM-68/27 ;
  • Resource Type:
  • Geographical Coverage:
  • NTL Classification:
    NTL-AVIATION-Aviation Human Factors ; NTL-AVIATION-Aviation Safety/AirworthinessNTL-SAFETY AND SECURITY-Aviation Safety/Airworthiness ; NTL-SAFETY AND SECURITY-Human Factors ;
  • Format:
  • Abstract:
    Signal lights are presented to an observer as flashes with finite duration; thus, the effect of flash duration on the apparent brightness of the signal is important. The relation of effective signal brightness to flash duration and luminance finds expression in the Broca-Sulzer phenomenon. This study was concerned with the effect of method of measuring brightness and with the effect of adaptive state of the eye on the Broca-Sulzer phenomenon.

    Subjects adjusted the luminance of test flashes 1 to 1000 msec. in duration to match either the loudness of a 500 msec. comparison tone (1000 Hz) or the brightness of a 500 msec. comparison flash. Comparison tone loudness were 75, 86, and 97 dB. Comparison flash luminances were 10, 100, and 1000 mL. In the light-adapted condition, a 1.5 sec. adapting flash was presented 2.5 sec. before the comparison flash. No adapting flash was presented in the dark-adapted condition. The Broca-Sulzer effect appeared only with the highest comparison stimulus intensities in both crossmodality matching and brightness matching conditions.

    This finding conflicts with the hypothesis that the Broca-Sulzer effect is obtained only when the procedure for measuring brightness involves a visual comparison stimulus. An interaction found between method of measuring brightness and adaptive state was also discussed. The findings are pertinent to the prediction of effective brightness of a signal since, under some conditions, apparent brightness does not increase steadily with increased duration but, rather, evidences a peaking effect.

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