Adaptive Measurement of Vigilance Decrement

An Adaptive Vigilance Task with Knowledge of Results

“…The signal was then displayed, and W was stored in core memory for typeout later. The adaptive task and procedure is discussed in greater detail, accompanied by flowchart, in the previous paper by the author (Wiener, 1973).…”

“…Some investigators (eg., Adams and Humes, 1963) have preferred reaction time and some (e.g., Colquhoun and Edwards, 1970) have used the signal detection measures d' and p, derived from detections and false alarms. Recently Wiener (1973) showed the feasibility of yet another measure, by making the size of the signal (and hence its conspicuity) an "adaptive variable" (Kelley, 1969) by employing a computer-based task that was self-adjusting. As the subject mastered the task, as measured by high detection rates, .it wa?…”

Methyl chloride and diazepam effects on performance.

“…All three tasks were designed to assess different aspects of human attention or alertness, and they were adaptive in that signal conspicuity was performance-adjusted to maintain a stable criterion. Stability was achieved by the automatic increasing or decreasing of the level of the task load (input) to correspond to the operator's performance (12). Hence, 80 to 90 0J0 of the measured variance on a given trial was a response to the optimum level of the task load introduced during a given experimental condition.…”

“…The visual-vigilance task resembled an automated version of Mackworth's Clock Test (5) with a CRT display (8,12). Once every second a light dot (0.2 cm in diameter) "jumped" a standard distance of 5 cm away from the center of the display (velocity = 40 cm/s), paused for 0.35 s, and then returned to the center for 0.35 s. At random times (range 10-170 s, mean 90 s) the length of the "jump" was increased or decreased by X times delta.…”

“…Methyl chloride and diazepam effects on permormance. Scand j work environ health 7 (1981) [8][9][10][11][12][13]. Human behavioral effects resulting from the ingestion of an average dose of diazepam and from 3 h of inhaling either 100 ppm or 200 ppm of methyl chloride (MeCI) were studied in the laboratory.…”