Temporal sensitivity changes with extended training in a bisection task in a transgenic rat model.

Area of Science:

• Neuroscience
• Behavioral Science
• Genetics

Background:

• Huntington disease (HD) is a neurodegenerative disorder impacting motor and cognitive functions.
• Temporal perception deficits are increasingly recognized in neurological conditions.
• Transgenic rat models offer valuable insights into HD pathophysiology.

Purpose of the Study:

• To investigate temporal perception in a Huntington disease transgenic rat model.
• To analyze the evolution of temporal processing over time in these rats.
• To explore the interplay between temporal sensitivity and motivational factors.

Main Methods:

• Utilized a temporal bisection procedure with auditory stimuli of varying durations.
• Employed a longitudinal design, testing rats from 4 to 8 months of age.
• Incorporated discrimination training with fixed (2s and 8s) and intermediate tone durations.

Main Results:

• Response latencies shifted from a step-function to an inverted U-shaped curve with repeated testing.
• This change indicated a transition towards non-responding on intermediate duration trials.
• Temporal sensitivity improved with task structure changes or continued training.

Conclusions:

• Temporal perception in HD rats is influenced by both temporal sensitivity and incentive motivation.
• Non-temporal factors may play a compensatory role in mitigating temporal processing deficits.
• The study highlights the complexity of temporal bisection tasks in disease models.