封闭性知觉在大范围优先性中的特殊性

本文研究当封闭性作为被试分辨的图形性质时，空间位置不确定性和视野位置对大范围优先性有何影响。实验发现：（１）无论复合刺激呈现在视野的中央或外周．分辨复合刺激的整体性质的反应时（ＲＴ）比分辨局部性质的ＲＴ短，整体性质对分辨局部性质的反应有较强的干扰作用。相反，局部性质对分辨整体性质的反应的影响较小；（２）刺激位置的不确定对大范围优先性没有显著影响；（３）与周边刺激相比，分辨视野中央的复合刺激的ＲＴ较短，但整体性质的ＲＴ优势和对局部性质的干扰作用，不受刺激在视野中的位置的影响。这些实验结果揭示了封闭性知觉在大范围优先性中的特殊性。

PECULIARITIES OF CLOSURE PERCEPTION IN THE GLOBAL PRECEDENCE

The present study investigated the effects of locational uncertainty and stimulus position in the visualfield on the global precedence effect when subjects discriminated closure of global and local shapes of compound stimuli. It was found that 1) RT and interference effect showed a global advantage when compoundstimuli were presented in the center or the periphery ofthe visual field ; 2) the global precedence effect did notdiffer no matter whether stimulus positions were certain or uncertain; 3) RTs to the stimuli presented inthe central visual field were shorter than those to thestimuli in the peripheral visual field. However, theglobal precedence effect was not affected by stimuluspositions in the visual field. These findings revealedthe peculiarity of closure perception in the globalprecedence effect.