Probabilistic Information Modulates the Timed Response Inhibition Deficit in Aging Mice

Area of Science:

• Neuroscience
• Behavioral Neuroscience
• Aging Research

Background:

• Interval timing and temporal decision-making are crucial cognitive functions.
• Aging's effects on these functions, particularly in animal models, are understudied.
• Understanding age-related cognitive changes is vital for developing interventions.

Purpose of the Study:

• To investigate how aging affects temporal decision-making and interval timing in mice.
• To compare the adaptive timing behavior of young and old mice.
• To identify age-related deficits in processing temporal-spatial-probabilistic information.

Main Methods:

• Young (2-3 months) and old (18-19 months) C57BL/6J male mice were trained on short (3s) and long (9s) intervals.
• Trial type (short/long interval) was signaled by hopper location.
• Probability of short/long trials was manipulated (0.25 or 0.75) during training.

Main Results:

• Both young and old mice adapted their timing behavior based on learned temporal-spatial-probabilistic information.
• Older mice demonstrated intact core interval timing abilities.
• Old mice exhibited difficulty terminating timed responses when short intervals were more probable, a deficit mitigated by lower short-trial probability.

Conclusions:

• Aging does not impair core interval timing but affects the ability to modulate response thresholds in timed decisions.
• Older mice show an age-related inhibition deficit, particularly when processing high probabilities of short intervals.
• This deficit is cognitively penetrable, suggesting plasticity in age-related timing impairments.