Successive olfactory reversal learning in honeybees

Area of Science:

• Animal behavior
• Neuroethology
• Olfactory learning

Background:

• Honeybees (Apis mellifera) exhibit associative learning, linking neutral odors with sucrose rewards.
• They can perform differential conditioning, responding to reinforced odors and ignoring non-reinforced ones.
• Bees demonstrate the capacity for choice reversal in learned associations.

Purpose of the Study:

• To investigate if honeybees can learn successive olfactory differential conditioning tasks with overlapping odor pairs.
• To determine if prior experience with reversal learning impacts the ability to solve subsequent discrimination reversals.
• To assess the adaptive significance of successive reversal learning in honeybees.

Main Methods:

• Honeybees were trained using conditioning schedules with varying numbers of previous reversals (0, 1, 2, or 3) before a final differential conditioning phase.
• A comparative approach was used, contrasting the performance of bees with and without prior reversal experience in a new reversal task.
• The proboscis extension reflex was used as the behavioral measure of learning and discrimination.

Main Results:

• Bees with previous reversal learning experience (three reversals) performed significantly better on the final reversal task compared to naive bees.
• Even a single prior reversal learning experience was sufficient to enhance performance in the subsequent reversal task.
• Successive reversal learning was demonstrated to be possible in honeybees.

Conclusions:

• Experiencing successive olfactory discrimination reversals enhances a honeybee's ability to solve new reversal tasks.
• This improved performance suggests an adaptive benefit, mirroring the natural foraging behavior of switching between floral resources.
• Successive reversal learning has positive implications for both individual honeybee foraging efficiency and colony-level resource exploitation.