From automatic integration to selective control: time-resolved effects of sensory cues on numerical comparison

Area of Science:

• Cognitive psychology
• Neuroscience
• Human perception

Background:

• Approximate numerical cognition is influenced by non-numerical sensory cues.
• Debate exists on whether these cues inhibit processing or are integrated based on weight.

Purpose of the Study:

• To test a temporally staged, cue-specific account of numerical comparison.
• To differentiate between inhibitory control and sensory integration theories.

Main Methods:

• Orthogonally manipulated numerosity with convex hull (high-weight) and average dot size (low-weight) cues.
• Recorded fronto-central event-related potentials (ERPs): P2 and N450.
• 25 adults performed rapid dot array comparisons under four congruency conditions.

Main Results:

• Behavior demonstrated convex hull dominance; accuracy depended on convex hull alignment with numerosity.
• ERPs showed a two-stage process: early P2 tracked dot-size congruency, late N450 scaled with conflict and cue weight.
• No latency differences were observed in ERPs.

Conclusions:

• Results support a time-resolved, weight-sensitive mechanism for numerical decisions.
• Basic features bias early integration; holistic cues dominate later stages, especially when misaligned.
• The findings reconcile sensory integration and inhibitory control theories.