Visual Demand of Driving Curves as Determined by Visual Occlusion
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Abstract
VISUAL DEMAND OF DRIVING CURVES AS DETERMINED BY VISUAL OCCLUSION Omer TSIMHONI and Paul A. GREEN The University of Michigan Transportation Research Institute, 2901 Baxter Road, Ann Arbor, Michigan 48109-2150, USA Abstract The visual demand of driving was determined using the visual occlusion method. In this method, drivers pressed a switch to get a half-second glimpse of the road. Otherwise, the road was occluded. Visual demand was defined as the proportion of time the road was visible. Twenty
Summary
HFES conference proceedings report (Aspire Conference) documenting N-back temporal instability findings. Two-experiment study showing N-back performance improvement and workload decrease over 26+ on-road driving sessions. Experiment 1: 10 participants with 26+ exposures show systematic accuracy increases and cognitive demand decreases. Experiment 2: Old vs New digit sequences tested with 20 participants; equivalent performance confirms strategy-based improvement.
Key finding
N-back accuracy and DRT-based workload measures show systematic drift over repeated on-road sessions, with improvements attributable to general strategy acquisition (subvocal rehearsal, automatization) rather than sequence-specific learning.
Methodology
Exp 1: 10 participants, repeated measures across 6 sessions from 26 total. Exp 2: 20 participants, Old/New sequence comparison. On-road driving paradigm with DRT and NASA-TLX measures.
Sample size: Exp 1: N=10; Exp 2: N=20
Quality score: 5 / 5