Discrimination of short-duration (two-pulse) flashes as a function of signal luminance and method of measurement.

Mertens, Henry W.; Lewis, Mark F.; Civil Aeromedical Institute

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Discrimination of short-duration (two-pulse) flashes as a function of signal luminance and method of measurement.

1971-11-01
By Mertens, Henry W. ; Lewis, Mark F.

[PDF-591.52 KB]

English

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Details:

Creators:

Mertens, Henry W. ; Lewis, Mark F.

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

Civil Aeromedical Institute
Corporate Contributors:

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

[+]

Airplanes--Lighting Detection And Identification Experiments Eye Eye--Movements Eye Fixations Flicker Human Subject Testing Luminance Luminescence Luminous Intensity Photometers Photometry Psychology Psychometrics Psychophysics Pulse-duration Modulation Pulse Duration Modulation Pulses Signal Detection (Psychology) Signal Lights Strobes Stroboscopes Time Intervals Vision Vision--Testing Vision Tests Visual Perception Visual Perception--Testing
Publication/ Report Number:

FAA-AM-71-42 ; DOT/FAA/AM-71/42

FAA-AM-71-42 ; DOT/FAA/AM-71/42 Less -
Resource Type:

Tech Report
Geographical Coverage:

United States
Edition:

OAM report.
Corporate Publisher:

Civil Aerospace Medical Institute
Abstract:

The recent introduction of strobe lights for anticollision purposes raises the possibility of using temporal patterns of short duration flashes as information carrying signals. The current experiments are concerned with the detection of the minimum duration dark interval between signal light pulses as a function of signal luminance and the psychophysical method of measurement.

Experiment I tested the theory of signal detectability (TSD) prediction that observer sensitivity is independent of the psychophysical method used in measurement. Discrimination of a constant duration stimulus (three msec) and a variable duration test stimulus (seven to 32 msec) was measured with a two- alternative Forced-Choice (FC) procedure and a Yes-No procedure. Sensitivity was comparable under the two psychophysical procedures, thus supporting the application of TSD to the sensory processes involved in discrimination of two- pulse stimuli.

Experiment II measured discrimination with the FC procedure at three luminance levels: 31.8, 318, and 3183 candelas per square meter. Discriminability increased with luminance. Thus, pulses separated by a dark interval short enough so that only a single flash is seen over the entire scotopic intensity range may, however, be seen at photopic intensities as two pulses, or appear to flicker, or otherwise appear to be of different character.
Format:

PDF
Collection(s):

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

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urn:sha256:d4dafe4c3b9741cec65f3e231e523e7660a6a19b07299163139625b0fa3d5f02
Download URL:

https://rosap.ntl.bts.gov/view/dot/20979/dot_20979_DS1.pdf
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Discrimination of short-duration (two-pulse) flashes as a function of signal luminance and method of measurement.

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