Assessment of the broca-sulzer phenomenon via inter- and intra-modality matching procedures : studies of signal-light brightness.

Lewis, Mark F.; Mertens, Henry W.

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Assessment of the broca-sulzer phenomenon via inter- and intra-modality matching procedures : studies of signal-light brightness.

1968-10-01
By Lewis, Mark F. ; Mertens, Henry W.

[PDF-423.99 KB]

English

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Creators:

Lewis, Mark F. ; Mertens, Henry W.

Lewis, Mark F. ; Mertens, Henry W. Less -
Corporate Contributors:

United States. Office of Aviation Medicine
Subject/TRT Terms:

[+]

Air Pilots Alternatives Analysis Brightness Brightness Perception Dark Adaptation Experiments Human Subject Testing Lighting Luminescence Luminous Intensity Night Vision Optical Devices Signal Lights Vision Vision--Testing Vision Tests
Publication/ Report Number:

AM 68-27 ; DOT/FAA/AM-68/27

AM 68-27 ; DOT/FAA/AM-68/27 Less -
Resource Type:

Tech Report
Geographical Coverage:

United States
Corporate Publisher:

Civil Aerospace Medical Institute
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.
Format:

PDF
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FAA Civil Aerospace Medical Institute US Transportation Collection
Main Document Checksum:

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urn:sha256:b0f8711de0d6e5be28bbbc44141834d6ef59c94dee4d1fb9eb9cb15ebaedc147
Download URL:

https://rosap.ntl.bts.gov/view/dot/20882/dot_20882_DS1.pdf
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Assessment of the broca-sulzer phenomenon via inter- and intra-modality matching procedures : studies of signal-light brightness.

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