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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Computer Vision

Background:

  • Debate exists on whether overt attention in natural scenes is driven by object content or low-level stimulus features.
  • Previous studies suggested object locations diminish the explanatory power of salience models, but this was challenged by inadequate early salience models.
  • State-of-the-art salience models outperform basic object-based models.

Purpose of the Study:

  • To investigate whether object-based models, incorporating a preferred viewing location (PVL) near object centers, can match the performance of salience models in predicting human fixations.
  • To directly test the hypothesis that objects, rather than early salience, dominate attentional guidance by manipulating low-level salience within object-rich areas.
  • To provide evidence for object-based fixation selection and attentional guidance in natural scenes.

Main Methods:

  • Developed object-based models incorporating a preferred viewing location (PVL) near object centers.
  • Conducted experiments predicting fixations in natural scenes using both object-based and state-of-the-art salience models.
  • Modified natural scenes by reducing low-level salience in areas with high object content for further testing in object-naming and free-viewing tasks.

Main Results:

  • When incorporating PVL, object-based models performed comparably to state-of-the-art salience models in predicting fixations.
  • In modified stimuli where low-level salience was reduced within object areas, object-based models significantly outperformed early salience models.
  • This improved predictive power of object-based models was consistent across both object-naming and free-viewing tasks.

Conclusions:

  • Object content, particularly through preferred viewing locations, plays a dominant role in guiding attention and fixations in natural scenes.
  • Early salience models may predict fixations indirectly through their correlation with object locations.
  • These findings provide strong evidence for object-based attentional guidance.