Inter-session delay and its effects on performance and retention of spatial learning on a radial maze with mice

Area of Science:

• Neuroscience
• Animal Behavior
• Cognitive Psychology

Background:

• Spatial learning is crucial for survival and is influenced by various factors.
• Understanding memory consolidation requires analyzing the impact of time delays between learning sessions.
• Inbred mouse strains offer a genetically controlled model for studying cognitive processes.

Purpose of the Study:

• To investigate the effect of varying inter-session delays on spatial learning and memory retention in two inbred mouse strains.
• To determine the optimal delay period for effective spatial learning and long-term memory recall.
• To compare the performance of C57BL/6 and DBA/2 mice under different delay conditions.

Main Methods:

• Radial maze task was used to assess spatial learning in C57BL/6 and DBA/2 mice.
• Five delay intervals (0 min, 40 min, 2 h, 8 h, 24 h) were implemented between training sessions.
• Performance was evaluated during training and in a retention test conducted one month later.

Main Results:

• Short delays (0-40 min) impaired learning ability in both mouse strains.
• Delays of 2 hours or more facilitated rapid learning.
• Strain-specific optimal delays were observed for long-term retention: C57BL/6 (2 h) and DBA/2 (2-8 h).

Conclusions:

• Inter-session delay is a critical procedural variable in spatial learning.
• The effectiveness of spatial learning protocols depends on the duration of the delay between sessions.
• Mouse strain differences influence the optimal delay for spatial memory consolidation and recall.