Space-magnitude associations modulate the familiar-size stroop effect in visual size judgments

Area of Science:

• Cognitive Psychology
• Neuroscience
• Human Perception

Background:

• The familiar-size Stroop effect demonstrates how real-world size knowledge interferes with visual size judgments.
• This interference occurs when an object's familiar size conflicts with its presented visual size, leading to slower reaction times.
• The role of spatial-magnitude associations, particularly the mental number line (MNL), in modulating this effect remains underexplored.

Purpose of the Study:

• To investigate the interaction between Stroop congruency and mental number line (MNL) compatibility in size perception.
• To determine how space-magnitude associations influence the familiar-size Stroop effect.
• To analyze the impact of MNL compatibility on reaction times and their distributions under different Stroop conditions.

Main Methods:

• Participants performed size comparison tasks, identifying smaller or larger objects while ignoring real-world sizes.
• Four experimental conditions were used: Stroop-congruent/MNL-compatible, Stroop-congruent/MNL-incompatible, Stroop-incongruent/MNL-compatible, and Stroop-incongruent/MNL-incompatible.
• Task sequences involved either small-then-large or large-then-small object identification, with reaction time (RT) distribution analyses.

Main Results:

• MNL compatibility significantly modulated Stroop interference, reducing it in compatible conditions and increasing it in incompatible conditions.
• The effect of MNL compatibility varied based on task type and the order of object sizes presented.
• RT distribution analyses indicated that MNL effects appeared in slower RT bins for Stroop-congruent trials and faster bins for Stroop-incongruent trials within specific sequences.

Conclusions:

• Space-magnitude associations, specifically MNL compatibility, play a crucial role in shaping the familiar-size Stroop effect.
• These findings highlight a complex interplay between spatial representations (MNL) and conceptual knowledge (familiar size) in visual size judgments.
• The study reveals nuanced mechanisms underlying size perception and cognitive interference.