A new rapid protocol for eyeblink conditioning to assess cerebellar motor learning

Area of Science:

• Neuroscience
• Motor Learning
• Cerebellar Function

Background:

• The cerebellum is critical for motor learning, including associative tasks like eyeblink conditioning.
• Investigating the neurochemical basis of cerebellar learning has been limited by lengthy training protocols.

Purpose of the Study:

• To develop a rapid training protocol for delayed eyeblink conditioning.
• To elucidate the role of the δ2 glutamate receptor (GluD2) in cerebellar Purkinje cells in associative motor memory.

Main Methods:

• Developed a novel single-day training protocol for delayed eyeblink conditioning in mice.
• Utilized GluD2-null mice and in vivo gene expression techniques (Sindbis virus).
• Assessed long-term memory retention and extinction of conditioned responses.

Main Results:

• The rapid protocol reliably induced robust delayed eyeblink conditioning within one day.
• Associative memory formation was dependent on GluD2 expression in Purkinje cells.
• Conditioned responses persisted for weeks and could be rapidly extinguished.

Conclusions:

• A rapid eyeblink conditioning protocol facilitates neurochemical investigation of cerebellar motor learning.
• GluD2 in Purkinje cells is essential for the formation and consolidation of cerebellar associative motor memories.
• This protocol enables studies in younger animals and rescue experiments in genetic models.