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Related Experiment Videos

Trace and long-delay fear conditioning in the developing rat.

Robert C Barnet1, Pamela S Hunt

  • 1Department of Psychology, College of William & Mary, Williamsburg, Virginia, USA. rcbarn@wm.edu

Learning & Behavior
|April 1, 2006
PubMed
Summary
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Trace conditioning emerges later in development than short-delay conditioning in rats. Longer interstimulus intervals, not the gap itself, appear crucial for this developmental delay in trace conditioning.

Area of Science:

  • Neuroscience
  • Developmental Psychology
  • Behavioral Science

Background:

  • Conditioned freezing is a key indicator of associative learning in rodents.
  • Developmental differences in learning paradigms, such as trace and delay conditioning, are not fully understood.
  • The interstimulus interval (ISI) is a critical factor influencing conditioning strength and emergence.

Purpose of the Study:

  • To investigate the developmental emergence of conditioned freezing in rats using trace and short-delay conditioning paradigms.
  • To compare the developmental trajectory of trace conditioning with short-delay and long-delay conditioning.
  • To elucidate the role of the interstimulus interval (ISI) in the developmental emergence of trace conditioning.

Main Methods:

  • Two experiments were conducted with rats to assess conditioned freezing.

Related Experiment Videos

  • Rats were exposed to either short-delay (10-sec CS paired with shock), trace (10-sec CS followed by a 10-sec trace interval and shock), or long-delay (20-sec CS paired with shock) conditioning.
  • The duration of the conditioned stimulus (CS) and the interstimulus interval (ISI) were manipulated across groups.

    • Main Results:

    • Trace conditioning emerged significantly later in development compared to short-delay conditioning.
    • Long-delay conditioning emerged at a similar developmental time and with comparable strength to trace conditioning.
    • These results indicate that the extended ISI, rather than the unfilled temporal gap, is associated with the delayed emergence of trace conditioning.

    Conclusions:

    • The findings suggest that the length of the ISI plays a critical role in the developmental emergence of trace conditioning.
    • The results challenge the notion that the unfilled temporal gap is the sole determinant of late-emerging trace conditioning.
    • Further research is warranted to explore the hippocampal role in trace conditioning and temporal encoding in young rats.