The Effects of Changes in Background Event Rate on Vigilance Performance: A Test of the Habituation Model of Vigilance

1973 ◽  
Author(s):  
Judith E. Krulewitz ◽  
Joel S. Warm ◽  
Theodore H. Wohl
Keyword(s):  
Event Rate ◽  
Vigilance Performance ◽  
Background Event

Effects of Background Event Rate and Critical Signal Amplitude on Vigilance Performance

1974 ◽  
Vol 38 (3_suppl) ◽  
pp. 1175-1181 ◽  
Author(s):  
Kurt R. Metzger ◽  
Joel S. Warm ◽  
Roderick J. Senter
Keyword(s):  
Event Detection ◽  
Detection Probability ◽  
Event Rate ◽  
Signal Amplitude ◽  
Overt Response ◽  
Vigilance Performance ◽  
Background Event ◽  
Critical Signal

Ss monitored a display consisting of the repetitive presentation of pairs of movements of a bar of light. A neutral background event, for which no overt response was required, was a double deflection of 24 mm. The critical signal for detection was a longer deflection in the second movement within an event. Detection probability was greater for incremental excursions of 33% relative to 8.3% of the base movement. This effect was enhanced twofold when the event rate in which the signals were embedded was 21 as compared to 6 events/min. The results are considered in terms of the elicited observing rate hypothesis proposed by Jerison (1970).

Feature Presence/Absence Modifies the Event Rate Effect and Cerebral Hemovelocity in Vigilance Performance

2004 ◽  
Vol 48 (16) ◽  
pp. 1943-1947 ◽  
Author(s):  
Todd D. Hollander ◽  
Joel S. Warm ◽  
Gerald Matthews ◽  
Kevin Shockley ◽  
William N. Dember ◽  
...  
Keyword(s):  
Event Rate ◽  
Rate Effect ◽  
Vigilance Performance ◽  
Cerebral Hemovelocity

Feature presence/absence modifies the event rate effect and cerebral hemovelocity in vigilance performance

2004 ◽  
Author(s):  
Todd D. Hollander ◽  
Joel S. Warm ◽  
Gerald Matthews ◽  
Kevin Shockley ◽  
William N. Dember ◽  
...  
Keyword(s):  
Event Rate ◽  
Rate Effect ◽  
Vigilance Performance ◽  
Cerebral Hemovelocity

Effects of Demand Transitions on Vigilance Performance and Perceived Workload

1995 ◽  
Vol 39 (21) ◽  
pp. 1375-1379 ◽  
Author(s):  
Brian W. Moroney ◽  
Joel S. Warm ◽  
William N. Dember
Keyword(s):  
Event Rate ◽  
Mental Workload ◽  
Task Demand ◽  
Experimental Session ◽  
Vigilance Performance ◽  
Mental Demand ◽  
Perceived Workload ◽  
Nasa Tlx ◽  
Low Levels ◽  
Upper Level

This study examined the effects of transitions in task demand on vigilance performance and perceived mental workload. Task demand was manipulated through variations in background event rate–the rate of cascade of neutral events which must be monitored in order to detect critical signals. As is typical in vigilance research, overall performance varied inversely with event rate in all phases of the study. The post-transition performance of observers shifted from a fast-to-slow event rate (high-to-low task demand) remained below that of their continuous slow event rate controls, and was thus unaffected by the shift. In contrast, the post-transition performance of monitors shifted in the opposite direction, slow-to-fast event rate, was affected by the shift. In this case, the performance of the shifted observers fell below that of their continuous fast event rate controls. These results challenge prior findings indicating that psychophysical contrast is the representative outcome of shifts in information-processing demand in vigilance tasks (Krulewitz, Warm, & Wohl, 1975). Consistent with previous findings, workload scores, as indexed by the NASA-TLX, fell at the mid-to-upper level of the scale. Shifted observers who experienced both high and low levels of task demand during the vigil showed differences in composite ratings on the Mental Demand subscale. These results serve to caution that workload measurements obtained through the NASA-TLX at the end of an experimental session containing variations in task demand do not simply reflect an averaging of the observer's demand experiences.

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