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Learning and latent inhibition in old mice
H Francès1, M R Tebbakha, J M Bourre
1INSERM U. 26, Hôpital Fernand Widal, 200 rue du Faubourg Saint-Denis, 75475 Paris cedex 10, France. henriette.frances@inserm.lrb.ap-hop-paris.fr
Neuroscience Letters
|November 22, 2001
Summary
Older mice show reduced learning ability but maintain selective attention. Latent inhibition (LI), a measure of attention, remained consistent across young and older female mice, suggesting age does not impair this cognitive function.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Animal Behavior
Background:
- Selective attention is crucial for cognitive processing.
- Latent inhibition (LI) is a learning phenomenon reflecting inhibitory processes in attention.
- Age-related cognitive decline can affect learning and attention.
Purpose of the Study:
- To compare the inhibitory component of selective attention in young and older female mice.
- To investigate the impact of aging on latent inhibition (LI).
- To assess learning ability in aging mice.
Main Methods:
- Utilized the latent inhibition (LI) paradigm with an active avoidance task in young (7-8 weeks) and older (9-10 months) female mice.
- Assessed avoidance of electric footshocks signaled by a sound after non-reinforced pre-exposure.
- Measured pain threshold to rule out sensory differences.
Main Results:
- Older mice exhibited significantly reduced avoidance of footshocks compared to young mice, indicating slower learning.
- No significant difference in pain threshold was observed between age groups.
- Latent inhibition (LI) was present and equally effective in both young (46%) and older (49%) mice.
Conclusions:
- Aging in mice (8-9 months old) is associated with impaired learning ability.
- The inhibitory component of selective attention, as measured by latent inhibition (LI), remains intact in older mice.
- These findings suggest that specific cognitive functions, like selective attention, may be preserved despite age-related learning deficits.