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Thinking Crickets: 'Cognitive' Processes Underlie Memory Recall In Crickets

Date:
August 5, 2009
Source:
BioMed Central
Summary:
Activation of two different kinds of neurons is necessary for appetitive and aversive memory recall in crickets. Researchers blocked octopaminergic (OA-ergic) and dopaminergic (DA-ergic) transmission and found that this resulted in the inability to recall pleasant and unpleasant memories, respectively.

Activation of two different kinds of neurons is necessary for appetitive and aversive memory recall in crickets. Researchers blocked octopaminergic (OA-ergic) and dopaminergic (DA-ergic) transmission and found that this resulted in the inability to recall pleasant and unpleasant memories, respectively.

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Makoto Mizunami (now at Hokkaido University, Japan) led a team of researchers from Tohoku University, Japan, who carried out the tests. He said, "This is the first study to suggest that classical conditioning in insects involves neural mediation between an originally neutral stimulus and a pleasant or unpleasant stimulus and the activation of these neural responses for memory recall. Such neural responses are often called cognitive processes in classical conditioning in higher vertebrates".

Mizunami and his colleagues previously reported that, in crickets, OA-ergic neurons and DA-ergic neurons convey signals about reward and risk, respectively. In this report, they found that blockers of synaptic transmission from OA-ergic and DA-ergic neurons prevented the insects from recalling which stimuli were related to the reward, and, therefore, could be approached, and which stimuli were related to the risk, so should be avoided. According to Mizunami, "These findings are not consistent with conventional neural models of classical conditioning in insects. Instead, we suggest that the cognitive account of classical conditioning proposed for higher vertebrates is applicable to insects".


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The above story is based on materials provided by BioMed Central. Note: Materials may be edited for content and length.


Journal Reference:

  1. Makoto Mizunami, Sae Unoki, Yasuhiro Mori, Daisuke Hirashima, Ai Hatano and Yukihisa Matsumoto. Roles of octopaminergic and dopaminergic neurons in appetitive and aversive memory recall in an insect. BMC Biology (, (in press) [link]

Cite This Page:

BioMed Central. "Thinking Crickets: 'Cognitive' Processes Underlie Memory Recall In Crickets." ScienceDaily. ScienceDaily, 5 August 2009. <www.sciencedaily.com/releases/2009/08/090803193645.htm>.
BioMed Central. (2009, August 5). Thinking Crickets: 'Cognitive' Processes Underlie Memory Recall In Crickets. ScienceDaily. Retrieved November 20, 2014 from www.sciencedaily.com/releases/2009/08/090803193645.htm
BioMed Central. "Thinking Crickets: 'Cognitive' Processes Underlie Memory Recall In Crickets." ScienceDaily. www.sciencedaily.com/releases/2009/08/090803193645.htm (accessed November 20, 2014).

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