Feature search in 2½D subjective surfaces: is it pre-attentive? M Wagner1, L Nozyk |
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1Industrial Engineering, Psychology, Ariel University, Israel
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| We studied visual feature search in two arrays of elements composed of identical properties. One composed of 2D elements (a cross among rings), perceived as 2D fronto-parallel surface. The other was the perceived 2D surface viewed from an elevated eye-position, composed of coherent volumetric elements lying on 2½D subjective surface. Contrary to target “pop-out” and no set-size in searching the 2D array, Treisman’s “feature integration theory” would regard search in the 2½D array conjunctive, since the 2½D elements differ in angular size, shape, and density. 10 participants searched both arrays (24 or 42 distractors), and 2½D scattered control arrays, while measured for separated Reaction Time (“view period” VP from trial-activating key press to release, and “Response-Period” key release to choice reaction), and eye-movements. Repeated-measures ANOVA revealed no significant difference between the 2D and 2½D conditions, but significantly longer VP’s during 2½D-controls. Detection efficiency was not affected by set-size. Less than three saccades were sufficient for target detection in both 2D and 2½D surfaces, significantly less than needed for the 2½D controls. Our results indicate that search in the 2½D surface preserved the 2D pre-attentive properties. Our results are discussed with reference to the rivers -hierarchy theory (Hochstein and Ahissar 2002). |
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