Table A3.

Studies Using Self-Paced Occlusion With an Unoccluded Default Setting

Reference	Occlusion Method	Driving Environment	N	Objective
Safford (1971) a	self-paced onset, self-paced occlusion duration, total field of view	open road	6	spare visual capacity assessment (also when intoxicated with CO)
Rackoff (1975) a	self-paced onset, self-paced occlusion duration, total field of view	open motorway	10	visual search and self-paced occlusion in old and young drivers
Shinar et al. (1978)	self-paced onset, self-paced occlusion duration, total field of view	open motorway	15	relation between information processing tasks and ability to occlude
Mourant and Mourant (1979) a	self-paced onset, self-paced occlusion duration, total field of view	open motorway	10	visual search and self-paced occlusion in old and young drivers
Tsimhoni and Green (2001)	self-paced onset, fixed occlusion duration (.5 s), total field on screen	sim fixed base	16	impact of visual demand on secondary task interactions
Kircher and Ahlström (2018) a	self-paced onset, self-paced occlusion duration, partial field with far periphery open	open motorway	12	evaluation of methods for attention assessment
Kircher et al. (2020) a	self-paced onset, self-paced occlusion duration, partial field with far periphery open	open motorway	25	differences between necessary and unnecessary glances away from the forward roadway
Liu et al. (2020)	self-paced onset, fixed occlusion duration (1.0 s, 1.4 s, 1.8 s, 2.2 s, 2.6 s), partial field on screen with far periphery open	sim fixed base	30	assess attentional demand of different contextual factors

Note. ^aEye- tracking was used simultaneously with occlusion.