Kinga Sobieralska

Publications (2)4.66 Total impact

• Source

  Available from: Margriet A Groen

  Article: Selection of features within and without objects: effects of gestalt appearance and object-based instruction on behavior and event-related brain potentials.

  Rolf Verleger, Margriet Groen, Wolfgang Heide, Kinga Sobieralska, Piotr Jaśkowski
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  ABSTRACT: We studied how physical and instructed embedding of features in gestalts affects perceptual selection. Four ovals on the horizontal midline were either unconnected or pairwise connected by circles, forming ears of left and right heads (gestalts). Relevant to responding was the position of one colored oval, either within its pair or relative to fixation ("object-based" or "fixation-based" instruction). Responses were faster under fixation- than object-based instruction, less so with gestalts. Previously reported increases of N1 when evoked by features within objects were replicated for fixation-based instruction only. There was no effect of instruction on N2pc. However P1 increased under the adequate instruction, object-based for gestalts, fixation-based for unconnected items, which presumably indicated how foci of attention were set by expecting specific stimuli under instructions that specified how to bind these stimuli to objects.
  Psychophysiology 06/2008; 45(3):499-510. · 3.29 Impact Factor
• Article: Effect of stimulus intensity on manual and saccadic reaction time.

  Piotr Jaśkowski, Kinga Sobieralska
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  ABSTRACT: Reaction time (RT) decreases with stimulus intensity. Hughes and Kesley (1984) demonstrated, however, that the effect of stimulus intensity on simple RT is larger for manual than for saccadic responses. We reexamined this relation under various conditions. The dissociation occurred when the task enabled the generation of exogenous saccades. We found, however, no dissociation if endogenous saccades had to be executed. It is hypothesized that the different effects of intensity result from the simplified neuronal processing of exogenous saccades performed in the direct route from the retina to the superior colliculus.
  Perception & Psychophysics 06/2004; 66(4):535-44. · 1.37 Impact Factor