Escape and avoidance learning in the earthworm Eisenia hortensis

W Jeffrey Wilson; Nicole C Ferrara; Amanda L Blaker; Charisa E Giddings

doi:10.7717/peerj.250

Escape and avoidance learning in the earthworm Eisenia hortensis

PeerJ. 2014 Jan 30:2:e250. doi: 10.7717/peerj.250. eCollection 2014.

Authors

W Jeffrey Wilson¹, Nicole C Ferrara¹, Amanda L Blaker¹, Charisa E Giddings¹

Affiliation

¹ Department of Psychological Science & Neuroscience Program , Albion College , Albion, MI , USA.

Abstract

Interest in instrumental learning in earthworms dates back to 1912 when Yerkes concluded that they can learn a spatial discrimination in a T-maze. Rosenkoetter and Boice determined in the 1970s that the "learning" that Yerkes observed was probably chemotaxis and not learning at all. We examined a different form of instrumental learning: the ability to learn both to escape and to avoid an aversive stimulus. Freely moving "master" worms could turn off an aversive white light by increasing their movement; the behavior of yoked controls had no effect on the light. We demonstrate that in as few as 12 trials the behavior of the master worms comes under the control of this contingency.

Keywords: Avoidance; Conditioning; Earthworm; Escape; Invertebrate behavior; Learning.

Grants and funding

Some materials were provided by the Lego Corporation. Additional funding was provided by Albion College’s Foundation for Undergraduate Research, Scholarship, and Creative Activity, Psychology Department, and Neuroscience Program. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.