Georg Raiser

Georg Raiser
University of Konstanz | Uni-Konstanz · Department of Biology

Dipl. Biol.

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20
Publications
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Publications

Publications (20)
Article
In insects, olfactory receptor neurons (ORNs) are localized in sensilla. Within a sensillum, different ORN types are typically co-localized and exhibit non-synaptic reciprocal inhibition through ephaptic coupling. This inhibition is hypothesized to aid odour source discrimination in environments where odor molecules (odorants) are dispersed by wind...
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Insect olfactory receptor neurons (ORNs) are often co-localized within sensilla and exhibit non-synaptic reciprocal inhibition through ephaptic coupling. It has been postulated that this inhibition aids odour source discrimination, as synchronous arrival of different odour molecules (odorants) from a single source should increase ephaptic inhibitio...
Article
Full-text available
Animals can form associations between temporally separated stimuli. To do so, the nervous system has to retain a neural representation of the first stimulus until the second stimulus appears. The neural substrate of such sensory stimulus memories is unknown. Here, we search for a sensory odor memory in the insect olfactory system and characterize o...
Data
Related to Figure 4: Post-odor response patterns of ORN axons and PN dendrites differ from odor response patterns. Corresponding graphs as in Figures 3A,B, for cross correlations between stimuli of increasing length (abscissa, from top to bottom), with a stimulus of 10 s length (ordinate, in each graph).
Data
Related to Figure 6: Odor and post-odor responses evolve differently in different brain areas. Corresponding graphs as in Figure 6 for cross correlations between responses to repeated presentation of the same odorant, in PN somata, KC dendrites and KC somata [columns (A–C), respectively]. See methods for odorant abbreviations.
Data
The olfactory stimulator produced odorant pulses, with steep odorant on- and off-sets. Traces show photoionization detector signals (PID, Model 200a, Aurora Scientific Inc.) during stimulation with the tracer substance ethyl acetate (undiluted, ionization potential 10.01 eV) for different pulse lengths (0.2, 0.4, 1, 3, 6 s in channel 1, and 10 s in...
Article
Full-text available
Dopaminergic neurons (DANs) signal punishment and reward during associative learning. In mammals, DANs show associative plasticity that correlates with the discrepancy between predicted and actual reinforcement (prediction error) during classical conditioning. Also in insects, such as Drosophila, DANs show associative plasticity that is, however, l...
Article
Full-text available
Animals encounter fine-scale temporal patterns of odorant mixtures that contain information about the distance and number of odorant sources. To study the role of such temporal cues for odorant detection and source localization, one needs odorant delivery devices that are capable of mimicking the temporal stimulus statistics of natural odor plumes....

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