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Types of Selection01:46

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Natural selection influences the frequencies of particular alleles and phenotypes within populations in several different ways. Primarily, natural selection can be directional, stabilizing, or disruptive. Directional selection favors one extreme trait and shifts the population towards that phenotype while selecting against individuals displaying alternate traits. Stabilizing selection favors an intermediate trait with a narrow range of variation. Deviation from the optimal phenotype towards an...
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Target selection during "snapshot" foraging.

Sofia Tkhan Tin Le1, Árni Kristjánsson2, W Joseph MacInnes3

  • 1University of Iceland, Reykjavik, Iceland. l.t.t.sophie@gmail.com.

Attention, Perception & Psychophysics
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Summary
This summary is machine-generated.

This study introduces "snapshot foraging" to better control attentional selection experiments. Results show target proportions influence choices, especially in conjunction foraging tasks.

Keywords:
Attentional switchingForagingSnapshotVisual attention

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Area of Science:

  • Cognitive Psychology
  • Computational Neuroscience

Background:

  • Previous foraging studies are limited by changing global statistics.
  • Attentional selection is influenced by target-to-distractor ratios.

Purpose of the Study:

  • To develop a controlled foraging task to study attentional selection.
  • To investigate the impact of local target proportions on selection behavior.
  • To differentiate feature-based from conjunction-based foraging.

Main Methods:

  • Introduced a "snapshot foraging" paradigm with controlled local displays.
  • Varied target and distractor types and proportions within each snapshot.
  • Analyzed response times and target choices based on trial statistics.

Main Results:

  • Target type proportion significantly affected selection behavior.
  • Conjunction foraging showed longer response times when alternate targets outnumbered repeated targets.
  • Previous selections influenced subsequent target choices.

Conclusions:

  • Snapshot foraging enhances experimental control over attentional selection studies.
  • Findings challenge previous assumptions about global statistics in foraging tasks.
  • This method offers a more precise way to understand continuous attentional orienting.