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Circadian modulation of interval timing in mice
Patricia V Agostino1, Micaela do Nascimento, Ivana L Bussi
1Laboratorio de Cronobiología, Departamento de Ciencia y Tecnología, Universidad Nacional de Quilmes, Buenos Aires, Argentina. pagostino@unq.edu.ar
Brain Research
|November 17, 2010
Summary
The circadian clock modulates short-term time estimation in mice. Accuracy in judging 24-second intervals varied with time of day and was impaired by disrupted circadian rhythms.
Area of Science:
- Neuroscience
- Chronobiology
- Animal Behavior
Background:
- Temporal perception is crucial for adaptation, involving circadian, interval, and millisecond timing systems.
- The suprachiasmatic nucleus (SCN) houses the circadian pacemaker, regulating ~24-hour cycles.
- Interval timing (seconds to minutes) relies on basal ganglia and prefrontal cortex interactions.
Purpose of the Study:
- To investigate if interval timing in mice is influenced by circadian rhythms.
- To determine the impact of constant light and circadian desynchronization on interval timing.
Main Methods:
- Mice were trained using the peak-interval (PI) procedure to estimate 24-second intervals.
- Experiments were conducted under standard light-dark, constant dark (DD), and constant light (LL) conditions.
- Circadian desynchronization models were used to simulate jet lag effects.
Main Results:
- Mice showed significantly different 24-second interval estimations depending on the time of day, with better accuracy at night.
- These temporal estimation differences persisted under constant dark conditions.
- Mice in constant light conditions failed to develop temporal control in the PI procedure.
- Circadian desynchronization negatively impacted short-time estimation.
Conclusions:
- The circadian clock significantly modulates interval timing in mice.
- Circadian rhythmicity is essential for acquiring and maintaining interval timing abilities.
- Disruptions to circadian timing, such as those experienced during jet lag, can impair short-time estimation.
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