Cited by 57Neurobiology and Insect Physiology ResearchMemory and Neural MechanismsNeuroscience and Neuropharmacology Research

Trace conditioning in insects—keep the trace!

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Dylla, Kristina V., Galili, Dana S., Szyszka, Paul, Lüdke, Alja·2013·Frontiers in Physiology

Abstract

Trace conditioning is a form of associative learning that can be induced by presenting a conditioned stimulus (CS) and an unconditioned stimulus (US) following each other, but separated by a temporal gap. This gap distinguishes trace conditioning from classical delay conditioning, where the CS and US overlap. To bridge the temporal gap between both stimuli and to form an association between CS and US in trace conditioning, the brain must keep a neural representation of the CS after its termination-a stimulus trace. Behavioral and physiological studies on trace and delay conditioning revealed similarities between the two forms of learning, like similar memory decay and similar odor identity perception in invertebrates. On the other hand differences were reported also, like the requirement of distinct brain structures in vertebrates or disparities in molecular mechanisms in both vertebrates and invertebrates. For example, in commonly used vertebrate conditioning paradigms the hippocampus is necessary for trace but not for delay conditioning, and Drosophila delay conditioning requires the Rutabaga adenylyl cyclase (Rut-AC), which is dispensable in trace conditioning. It is still unknown how the brain encodes CS traces and how they are associated with a US in trace conditioning. Insects serve as powerful models to address the mechanisms underlying trace conditioning, due to their simple brain anatomy, behavioral accessibility and established methods of genetic interference. In this review we summarize the recent progress in insect trace conditioning on the behavioral and physiological level and emphasize similarities and differences compared to delay conditioning. Moreover, we examine proposed molecular and computational models and reassess different experimental approaches used for trace conditioning.

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  1. Kamin L. J. (1965). Temporal and intensity characteristics of the conditioned stimulus, in Classical Conditioning: A Symposium, ed Prokasy W. F. (New York, NY: Appleton-Century-Crofts), 118– 147

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Authors
Dylla, K. V., Galili, D. S., Szyszka, P., & Lüdke, A.
Affiliations
  • Max Planck Society (DE)
  • University of Konstanz (DE)
Corresponding author
Lüdke, Alja
Venue
Frontiers in Physiology
Published
2013
Volume
4
Pages
67-67
ISSN
1664-042X (ISSN-L)
OpenAlex
W2071422380
Cited by
57
References
110
Citations by year
2026: 1 · 2025: 17 · 2024: 18 · 2023: 1 · 2022: 3 · 2021: 5 · 2020: 2 · 2019: 1 · 2018: 2 · 2017: 3 · 2016: 1 · 2015: 1 · 2014: 1 · 2013: 1
FWCI
0.65
Type
journal article
Language
en
Open access
Licence
cc-by
Locations
  • Frontiers in Physiology (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • KOPS (University of Konstanz) (submittedVersion, cc-by)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
  • Max Planck Digital Library (submittedVersion)
  • MPG.PuRe (Max Planck Society) (submittedVersion)
Funders
  • International Max Planck Research School for Environmental, Cellular and Molecular Microbiology
  • Minerva Foundation
  • Bundesministerium für Bildung und Forschung (01GQ0931)
  • Universität Konstanz
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurobiology and Insect Physiology Research
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
Keywords
trace conditioning, delay conditioning, associative learning, insects, time gap, memory decay, hippocampus, Drosophila, computational models of learning, memory encoding

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