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S. L. Rodriguez

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Publications by S. L. Rodriguez (bibliography)

1995

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Metalis, S. A., Pennella, R. N. and Rodriguez, S. L. (1995): Stick Control Modulations Index Pilot Mental Workload. In: Proceedings of the Human Factors and Ergonomics Society 39th Annual Meeting 1995. p. 952.

“A single subject repeated measures design, replicated four times, was used to investigate the utility of stick control modulations to index pilot workload. Four subjects engaged in an aircraft-type workload simulation task. Our modification of the Multi-Attribute Task Battery consisted of a primary task (a video-game-like stick control task, wherein the goal is to place crosshairs over an evasive target aircraft symbol), and a secondary task, (accuracy/time-to-respond to out-of-normal range cues to gauges and warning lights). The subject simultaneously performed the primary and secondary task on even numbered game trials; on odd numbered trials only the primary task was performed. On a relative scale the first two games were slow, the next two were medium, and the last two were fast. The three levels of workload due to gamespeed and two levels due to primary/secondary tasks comprised a six-game set. A subject's data from twenty such sets were analyzed in a 3 * 2 factorial design. For each 30-sec. game the dependent measures consisted of a set of three workload criterion variables, including global subjective workload ratings, accuracy scores (a function of time on target), and tracking RMS error; a set of eight statistics on stick modulations, including mean amplitude, velocity, acceleration, frequency, as well as amplitude SD, velocity SD, amplitude skew, and velocity skew; and a set of four power spectrum array (PSA) data from the x- and y- axis waveforms characterizing stick modulations, including energy in four bandwidths: .1 to .3 Hz, .3 to .6 Hz, .6 to 1.0 Hz, and 1.0 to 1.3 Hz. Findings indicate that the three criterion variables differed as a function of the two workload manipulations. But the stick statistics and the PSA data did not index the two workload dimensions equally well. All the dependent measures were influenced by the gamespeed dimension, whereas only the PSA at the .1 to .3 Hz band was influenced by the primary/secondary workload dimension. This evidence suggests that measures of stick modulations can help characterize pilot workload.”

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