Simultaneous and sequential comparisons of food quantity and consumption

Area of Science:

• Cognitive Psychology
• Behavioral Economics
• Food Science

Background:

• Previous research indicates biases in judging geometric shapes based on simultaneous or sequential presentation.
• Understanding how these visual comparison biases extend to food quantity judgments and consumption is crucial.

Purpose of the Study:

• To investigate the impact of food-quantity comparisons on judgments of food quantity and actual consumption.
• To determine if presentation method (simultaneous vs. sequential) influences these effects.

Main Methods:

• Experiment 1: Participants judged the size of mashed potato portions presented visually, either simultaneously or sequentially.
• Experiment 2: Participants consumed pasta salad from a smaller bowl after viewing two bowls presented simultaneously or sequentially.

Main Results:

• Memory biases for food portion sizes mirrored those found for geometric shapes in Experiment 1.
• Experiment 2 revealed an inverse relationship: consumption was affected by comparison quantities, with effects flipped compared to Experiment 1.
• Presentation order (simultaneous vs. sequential) significantly altered both quantity judgments and consumption.

Conclusions:

• Food consumption is demonstrably influenced by comparison quantities.
• The effect of comparison quantities on consumption is contingent upon whether items are presented simultaneously or sequentially.
• These findings have implications for understanding and potentially modifying eating behaviors through visual presentation.