Palatable meal anticipation in mice

Area of Science:

• Neuroscience
• Behavioral Biology
• Animal Behavior

Background:

• Anticipatory behavior is crucial for survival and is often studied in rodents using food restriction.
• Brain reward systems may play a role in anticipation, offering an alternative model to food restriction for studying neurobiology.
• Mice, less adapted to food restriction, provide an opportunity to study anticipation using genetic resources.

Purpose of the Study:

• To investigate if wild-type mice exhibit anticipatory locomotor activity for a daily palatable meal.
• To explore the influence of diet type and gender on anticipatory food reward behavior in mice.

Main Methods:

• Wild-type mice were provided with regular chow and limited access to palatable snacks (chocolate, Fruit Crunchies, or high-fat chow).
• Anticipatory behavior was measured using running wheels and video-based behavioral analysis.
• Food bin entries and locomotor activity were recorded before scheduled snack times.

Main Results:

• Mice did not show anticipatory activity for chocolate or Fruit Crunchies.
• Male mice exhibited increased food bin entries and modest activity before high-fat chow access.
• Female mice did not anticipate high-fat meals but increased activity when the meal was withdrawn at scheduled times.

Conclusions:

• Anticipation of scheduled food rewards in mice is highly specific to the behavior, diet composition, and gender.
• The study highlights the complexity of anticipatory behavior in mice, influenced by multiple factors.