Air traffic control displays alert the human operator when there is a conflict between the trajectories of aircraft by changing the color of the data tag and flashing it. Previous research has found that when estimating the time-to-contact (TTC) or when the objects will collide with one another, a bias exists such that humans rely more on distance information, rather than velocity information, to make a decision. However, little research has been conducted to determine whether urgency cues (i.e., changes in color and flashing) influence the distance-over-speed bias.
The purpose of this research is to investigate whether urgency cues facilitate the distance-over-speed bias observed in TTC estimation. 51 participants from the Psychology 100 subject pool participated in this study. Urgency was varied by color and flash rate, while target trajectory angle and velocity were varied based on factors shown to influence TTC in prior research studies (trajectory orientation and target velocity ratio).
Accuracy scores were used to measure TTC estimation error. The results of the current study indicate the existence of a distance-over-speed bias, replicating Law et al.’s findings. The bias was more pronounced when the targets were flashing (an urgency cue), as well as when there was as an increase in relative distance between the two objects, and when there was an increase in task difficulty. Design recommendations and directions for future research are discussed.
|Advisor:||Vu, Kim-Phuong L.|
|Commitee:||Miles, James, Strybel, Thomas Z.|
|School:||California State University, Long Beach|
|School Location:||United States -- California|
|Source:||MAI 58/05M(E), Masters Abstracts International|
|Subjects:||Psychology, Cognitive psychology|
|Keywords:||Air traffic control, Human factors, Motion perception, Relative judgement, Time to contact|
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