Perceiving Spatial Relations via Attentional Tracking and Shifting

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Perceiving Spatial Relations via Attentional Tracking and Shifting Alex O. Holcombe, Daniel Linares, Maryam Vaziri-Pashkam  Current Biology  Volume 21, Issue 13, Pages 1135-1139 (July 2011) DOI: 10.1016/j.cub.2011.05.031 Copyright © 2011 Elsevier Ltd Terms and Conditions

Figure 1 Schematics of the Stimuli and Tasks The schematics are not to scale, and the “Cue/Instructions” and “Response” column conveys the instructions and response options but does not use the exact same text as the experiments, which can be seen in the supplemental movies. Current Biology 2011 21, 1135-1139DOI: (10.1016/j.cub.2011.05.031) Copyright © 2011 Elsevier Ltd Terms and Conditions

Figure 2 Example Data for One Participant and Speed Limits for All Left: example data from one participant (author A.O.H.). Right: the speed limits for all observers (different shapes represent different observers, with A.O.H. in red). Each unfilled data symbol shows the 75% threshold for a single observer, estimated in R [26, 27] by fitting cumulative normal distributions via probit regression to proportion of correct responses against speed, after accounting for an assumed 1% lapse rate. For each task, the solid black point shows the mean across observers, and the error bars show the 95% confidence intervals from nonparametric bootstrapping, percentile method [28]. The alignment and identification tasks have faster speed limits than the within-ring, across-ring, or tracking tasks, for which the limits are not significantly different from each other. Thresholds above 3 rps could not be reliably estimated because the motion was spatially undersampled above that rate, a consequence of the 100 Hz refresh rate of the CRT screen. Each observer's identification threshold was in this 3+ rps range. Current Biology 2011 21, 1135-1139DOI: (10.1016/j.cub.2011.05.031) Copyright © 2011 Elsevier Ltd Terms and Conditions

Figure 3 Effect of Cueing on Outer-Trailing Errors The proportion of errors that were outer-trailing when a disc in the inner ring was cued (red symbols) and when the outer ring was cued (blue symbols), for five participants. The cuing determined which type of error predominated, in the direction predicted by the attention shift account. Error bars show 95% confidence intervals [29]. Current Biology 2011 21, 1135-1139DOI: (10.1016/j.cub.2011.05.031) Copyright © 2011 Elsevier Ltd Terms and Conditions