Abstract
Here, we report a species difference in the strength and duration of long-term sensorimotor adaptation in the electromotor output of weakly electric fish. The adaptation is produced by changes in intrinsic excitability in the electromotor pacemaker nucleus; this change is a form of memory that correlates with social structure. A weakly electric fish may be jammed by a similar electric organ discharge (EOD) frequency of another fish and prevents jamming by transiently raising its own emission frequency, a behavior called the jamming avoidance response (JAR). The JAR requires activation of NMDA receptors, and prolonged JAR performance results in long-term frequency elevation (LTFE) of a fish’s EOD frequency for many hours after the jamming stimulus. We find that LTFE is stronger in a shoaling species (Eigenmannia virescens) with a higher probability of encountering jamming conspecifics, when compared to a solitary species (Apteronotus leptorhynchus). Additionally, LTFE persists in Eigenmannia, whereas, it decays over 5–9 h in Apteronotus.






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Abbreviations
- JAR:
-
Jamming avoidance response
- EOD:
-
Electric organ discharge
- LTFE:
-
Long-term frequency elevation
- LTFD:
-
Long-term frequency depression
- PMn:
-
Pacemaker nucleus
- SPPn:
-
Sublemniscal prepacemaker nucleus
- PPn-G:
-
Thalamic prepacemaker nucleus portion G
- NMDA:
-
N-methyl-D-aspartatic acid
- AMPA:
-
alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid
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Acknowledgements
We thank Nikolai Dembrow, George Pollak, Wesley Thompson, and Frank Triefenbach for helpful comments. This work was supported by grant NIH MH56535 (to HZ). The experiments comply with the "Principles of animal care", publication No. 86–23, revised 1985 of the National Institute of Health.
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Oestreich, J., Zakon, H.H. Species-specific differences in sensorimotor adaptation are correlated with differences in social structure. J Comp Physiol A 191, 845–856 (2005). https://doi.org/10.1007/s00359-005-0006-4
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DOI: https://doi.org/10.1007/s00359-005-0006-4