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Measuring Attention and Visual Processing Speed by Model-based Analysis of Temporal-order Judgments
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Object-based attention: sensory enhancement or scanning prioritization.

Ming-Chou Ho1

  • 1Department of Psychology, Chung-Shan Medical University, Taichung, Taiwan. mingchou@csmu.edu.tw

Acta Psychologica
|June 3, 2011
PubMed
Summary
This summary is machine-generated.

Object-modulated attentional spreading was investigated using reaction time (RT) and accuracy (ACC) measures. Findings indicate that attention spreads within objects, particularly when using ACC measures, challenging RT-based interpretations.

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Area of Science:

  • Cognitive Psychology
  • Visual Attention
  • Perception

Background:

  • Investigating object-modulated attentional spreading when target location is certain.
  • Examining the utility of reaction time (RT) and accuracy (ACC) measures in attentional studies.
  • Differentiating between perceptual and postperceptual processes using RT and ACC.

Purpose of the Study:

  • To determine if object-modulated attentional spreading occurs with 100% target certainty.
  • To compare the effectiveness of RT and ACC measures in revealing attentional spreading.
  • To provide convergent evidence for object-based attention mechanisms.

Main Methods:

  • Experiment 1: Replicated null results using an RT-based flanker task.
  • Experiment 2: Employed a data-limited ACC-based measure to assess attentional spread.
  • Experiment 3: Adjusted presentation time to mitigate ceiling effects and confirm findings.

Main Results:

  • RT-based measures failed to show object-modulated attentional spreading.
  • ACC-based measures demonstrated attentional spread within attended objects.
  • Convergent evidence supports object-modulated attentional spreading under specific conditions.

Conclusions:

  • RT measures may be less sensitive to perceptual representation quality than ACC measures.
  • ACC measures provide stronger evidence for object-modulated attentional spreading.
  • Findings challenge the interpretation of RT data in distinguishing between sensory enhancement and scanning prioritization.