Effects of lunch on selective and sustained attention

Area of Science:

• Cognitive Psychology
• Human Performance
• Neuroscience

Background:

• Post-meal performance decrements are a recognized phenomenon in both real-world and laboratory settings.
• It remains unclear whether these impairments stem from the act of eating or other factors associated with the post-lunch period.

Purpose of the Study:

• To investigate if performance changes after lunch are caused by meal consumption or if they occur even with food abstinence.
• To identify specific cognitive functions most susceptible to post-lunch impairments.

Main Methods:

• Experimental design comparing performance after meal consumption versus food abstinence.
• Assessment of various cognitive aspects, including attention, reaction time, and distraction resistance.
• Analysis of performance variations based on time on task and meal timing.

Main Results:

• Significant impairment in the ability to maintain attention and react quickly to stimuli was observed after meal consumption.
• These effects on attention and reaction time were independent of time on task and meal timing.
• Performance in resisting distraction remained unaffected by meal consumption.
• Movement time showed diurnal variations but was not influenced by eating.

Conclusions:

• Post-lunch performance deficits, particularly in attention and reaction speed, are directly linked to the consumption of a meal.
• The ability to resist distraction is resilient to the effects of post-lunch eating.
• Cognitive functions are differentially affected by meal consumption, highlighting specific vulnerabilities.