On the role of top-down and bottom-up guidance in conjunction search: Singleton interference revisited.

No other main effect or interaction approached significance: nonsingleton features of the singleton target, F (1, 15) = 1.16, η p 2 = 0.07, p = 0.298; display size, F (1, 15) = 0.00, η p 2 = 0.00, p = 0.991; Target Presence × Nonsingleton Features of the Singleton Target, F (1,15) = 0.01, η p 2 = 0.00, p = 0.944; Target Presence × Display Size, F (1, 15) = 1.56, η p 2 = 0.09, p = 0.230; Nonsingleton Features of the Singleton Target × Display Size, F (1, 15) = 0.52, η p 2 = 0.03, p = 0.481; Target Presence × Nonsingleton Features of the Singleton Target × Display Size, F (1,15) = 0.77, η p 2 = 0.05, p = 0.409.

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Firstly, whilst the interference in conjunction search may be significant, it may be smaller than the interference observed in feature search (when closely matched displays are used).

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