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Related Experiment Videos

Step-down passive avoidance in the rat ontogeny.

J Myslivecek1, J Hassmannová

  • 1Institute of Hygiene and Epidemiology, Prague, Czechoslovakia.

Acta Neurobiologiae Experimentalis
|January 1, 1991
PubMed
Summary
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This study on passive avoidance (PA) learning in Wistar rats reveals non-monotonous memory development. While 6-week-old rats showed the most efficient learning, younger rats exhibited longer memory retention, indicating complex ontogeny of learning and memory.

Area of Science:

  • Neuroscience
  • Developmental Psychology
  • Animal Behavior

Background:

  • Passive avoidance (PA) is a common behavioral paradigm to study learning and memory.
  • Understanding the ontogeny of learning and memory is crucial for identifying critical developmental periods.

Purpose of the Study:

  • To investigate the ontogeny of step-down passive avoidance (PA) learning and memory in Wistar rats across different developmental stages.
  • To analyze specific learning and memory indices during acquisition and retention phases.

Main Methods:

  • 174 Wistar rats aged 2, 3, 4, 6, 8, and 13 weeks were tested on a step-down PA task.
  • Evaluated latency to descend (DL), number of descents (DN), time to criterion (TC), and time shocked (TS) during learning and two retention tests (R1, R2).

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Main Results:

  • Two-week-old rats failed to master the PA task.
  • Six-week-old rats demonstrated the most efficient learning and best retention performance (DN, TC, TS) at short intervals.
  • Three-week-old rats showed the longest latency to descend (DL), suggesting high fear motivation, while 3-month-old rats had zero DL in R1.

Conclusions:

  • Learning and memory development in rats is non-monotonous, with distinct age-related patterns.
  • Latency to descend (DL) as a memory index may be influenced by fear motivation, differing from other performance metrics.
  • Retention test reinforcement can facilitate memory retrieval, especially for indices like DN, TC, and TS.