Number adaptation: A critical look.

Area of Science:

• Cognitive Psychology
• Visual Perception
• Neuroscience

Background:

• Adaptation is often used to identify primary visual attributes.
• Number adaptation has been proposed as evidence for number being a primary visual attribute.
• The existence of number adaptation is largely accepted in the field.

Purpose of the Study:

• Critically assess the evidence for and against number adaptation.
• Propose and test an alternative explanation for existing findings: the old news hypothesis.
• Re-evaluate the utility of adaptation as a measure of visual attributes.

Main Methods:

• Systematic review of existing literature on number adaptation.
• Development of the "old news hypothesis" as an alternative account.
• Eight pre-registered experiments comparing the number adaptation hypothesis with the old news hypothesis.

Main Results:

• Identified reasons for skepticism regarding number adaptation.
• The old news hypothesis successfully explained previously anomalous findings.
• Experimental results consistently favored the old news hypothesis over the number adaptation hypothesis.
• Evidence supporting number adaptation was undermined across multiple fronts.

Conclusions:

• The traditional number adaptation hypothesis is significantly weakened by new experimental evidence.
• The old news hypothesis provides a more robust explanation for observed phenomena.
• The study questions the established role of adaptation in defining primary visual attributes.