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Article
Open AccessSpontaneous recovery from overexpectation in an insect
In associative learning in mammals, it is widely accepted that learning is determined by the prediction error, i.e., the error between the actual reward and the reward predicted by the animal. However, it is u...
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Article
Open AccessConditioned taste aversion in the cricket Gryllus bimaculatus
Conditioned taste aversion (CTA) is a form of classical conditioning in which animals associate the taste of a food with illness caused by toxin contained in the food. CTA in mammals is achieved with a long in...
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Article
Open AccessAppetitive and aversive social learning with living and dead conspecifics in crickets
Many animals acquire biologically important information from conspecifics. Social learning has been demonstrated in many animals, but there are few experimental paradigms that are suitable for detailed analysi...
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Article
Tyrosine hydroxylase-immunoreactive neurons in the mushroom body of the field cricket, Gryllus bimaculatus
The mushroom body of the insect brain participates in processing and integrating multimodal sensory information and in various forms of learning. In the field cricket, Gryllus bimaculatus, dopamine plays a crucia...
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Article
Open AccessRoles of dopamine neurons in mediating the prediction error in aversive learning in insects
In associative learning in mammals, it is widely accepted that the discrepancy, or error, between actual and predicted reward determines whether learning occurs. The prediction error theory has been proposed t...
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Article
Open AccessGroup-housed females promote production of asexual ootheca in American cockroaches
Facultative parthenogenesis, seen in many animal phyla, is a reproductive strategy in which females are able to generate offspring when mating partners are unavailable. In some subsocial and eusocial insects, ...
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Chapter
Learning and Memory
Crickets have excellent capabilities for olfactory and visual learning and thus are useful organisms in which to study the mechanisms of learning and memory. Our studies on crickets have revealed detailed info...
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Chapter
Protocols for Olfactory Conditioning Experiments
Insects have sophisticated learning abilities despite the relative simplicity of their central neural systems, which consist of small numbers of neurons as compared to vertebrates. Among insects, crickets (Gryllu...
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Article
Open AccessRoles of OA1 octopamine receptor and Dop1 dopamine receptor in mediating appetitive and aversive reinforcement revealed by RNAi studies
Revealing reinforcing mechanisms in associative learning is important for elucidation of brain mechanisms of behavior. In mammals, dopamine neurons are thought to mediate both appetitive and aversive reinforce...
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Article
Open AccessConvergence of multimodal sensory pathways to the mushroom body calyx in Drosophila melanogaster
Detailed structural analyses of the mushroom body which plays critical roles in olfactory learning and memory revealed that it is directly connected with multiple primary sensory centers in Drosophila. Connectivi...
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Article
Open AccessKnockout crickets for the study of learning and memory: Dopamine receptor Dop1 mediates aversive but not appetitive reinforcement in crickets
Elucidation of reinforcement mechanisms in associative learning is an important subject in neuroscience. In mammals, dopamine neurons are thought to play critical roles in mediating both appetitive and aversiv...
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Article
Open AccessCritical evidence for the prediction error theory in associative learning
In associative learning in mammals, it is widely accepted that the discrepancy, or error, between actual and predicted reward determines whether learning occurs. Complete evidence for the prediction error theo...
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Article
Open AccessToward elucidating diversity of neural mechanisms underlying insect learning
Insects are widely used as models to study neural mechanisms of learning and memory. Our recent studies on crickets, together with reports on other insect species, suggest that some fundamental differences exi...
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Article
Open AccessRoles of octopaminergic and dopaminergic neurons in appetitive and aversive memory recall in an insect
In insect classical conditioning, octopamine (the invertebrate counterpart of noradrenaline) or dopamine has been suggested to mediate reinforcing properties of appetitive or aversive unconditioned stimulus, r...
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Chapter and Conference Paper
Development of Invertebrate Brain Platform: Management of Research Resources for Invertebrate Neuroscience and Neuroethology
Various kinds of analysis and mathematical models based on neuroscience are develo** in the neural network study. In the research, experimental data and knowledge so far obtained are essential resources to d...
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Article
Pheromone communication and the mushroom body of the ant, Camponotus obscuripes (Hymenoptera: Formicidae)
Communication by means of pheromones plays predominant roles in colony integration by social insects. However, almost nothing is known about pheromone processing in the brains of social insects. In this study,...
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Chapter
Dynamics of Second-Order Neurons of Cockroach Ocelli
The incremental responses from second-order ocellar neurons of the cockroach, Periplaneta americana, were measured. The responses consisted of two components, graded potentials and spikes.
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Article
Intracellular stainings of the large ocellar second order neurons in the cockroach
The large ocellar second order neurons (L-neurons) in the cockroach,Periplaneta americana have been studied physiologically by intracellular recordings and morphologically by intracellular and whole nerve cobalt ...
