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. Author manuscript; available in PMC: 2016 Nov 1.
Published in final edited form as: Vision Res. 2015 Jan 10;116(0 0):179–193. doi: 10.1016/j.visres.2014.12.019

Figure 2. Heterogeneous search conditions considered by Navalpakkam and Itti.

Figure 2

(A) Distribution of the target and distractor features. The first panel depicts a task in which the target is always vertical, but each distractor is tilted 5° to the right or 5° to the left, with equal probability. According to previous studies, this task is more difficult for than for any of the other three. (B) Predictions of a optimal model for d′ in each of these four search conditions, for single-target detection and for a fixed level of measurement noise (σ=3). No effects of distributed attention were taken into account. (C) Same as (B), but for proportion correct in single-target localization.