Perception of illusory contour figures: Microgenetic analysis

Article English OPEN
Gvozdenović Vasilije P. (2004)
  • Publisher: Drustvo Psihologa Srbije
  • Journal: Psihologija (issn: 0048-5705)
  • Related identifiers: doi: 10.2298/PSI0404451G
  • Subject: amodal completion | microgenetic analysis | visual search | Psychology | BF1-990

Microgenetic analysis was used to investigate perception of illusory contour figures which represent whole, completed forms on the basis of segmented, incomplete stimulation. The analysis provided an experimental approach to this phenomenon which was standardly investigated phenomenologically. Experimental procedure consisted of two phases: a) priming phase and b) test phase which consisted of visual search task. Two types of visual search tasks were applied: (i) classic detection, in which subjects were detecting presence or absence of the target stimuli and (ii) two-alternative forced choice, 2AFC, in which subjects performed discrimination between two concurrent targets (target A vs. target B). Variation of exposition of prim stimuli was used as an indication of the percept formation period. Concepts like early vision, visual attention and feature binding were investigated. Four experiments were conducted. Their outcome showed that (i) perception of amodal figure requires visual attention, (ii) features binding precedes spatial attention and (iii) time period of percept formation is dependent of task properties and varies between 50 - 150 ms. Some results obtained in this research could be explained by feature-integration theory (Treisman & Gelade, 1980; Treisman, 1986). Furthermore, percept formation period data comply with data acquired in Elliott & Müller's psychophysical research (1998).
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