Articles by Martin Fritz Strube-Bloss in JoVE
Simultaneous Long-term Recordings at Two Neuronal Processing Stages in Behaving Honeybees Martin Fritz Brill1, Maren Reuter1, Wolfgang Rössler1, Martin Fritz Strube-Bloss1 1Department of Behavioral Physiology and Sociobiology (Zoology II) Biozentrum, University of Würzburg Simultaneous extracellular long term recordings from two different brain neuropiles or two different anatomical tracts were established in honeybees. These recordings allow the investigation of temporal aspects of neuronal processing across different brain areas at the single neuron as well as at the ensemble level in a behaving animal.
Other articles by Martin Fritz Strube-Bloss on PubMed
Mushroom Body Output Neurons Encode Odor-reward Associations The Journal of Neuroscience : the Official Journal of the Society for Neuroscience. Feb, 2011 | Pubmed ID: 21414933 Neural correlates of learning and memory formation have been reported at different stages of the olfactory pathway in both vertebrates and invertebrates. However, the contribution of different neurons to the formation of a memory trace is little understood. Mushroom bodies (MBs) in the insect brain are higher-order structures involved in integration of olfactory, visual, and mechanosensory information and in memory formation. Here we focus on the ensemble spiking activity of single MB output neurons (ENs) when honeybees learned to associate an odor with reward. A large group of ENs (âˆ¼50%) changed their odor response spectra by losing or gaining sensitivity for specific odors. This response switching was dominated by the rewarded stimulus (CS+), which evoked exclusively recruitment. The remaining ENs did not change their qualitative odor spectrum but modulated their tuning strength, again dominated by increased responses to the CS+. While the bees showed a conditioned response (proboscis extension) after a few acquisition trials, no short-term effects were observed in the neuronal activity. In both EN types, associative plastic changes occurred only during retention 3 h after conditioning. Thus, long-term but not short-term memory was reflected by increased EN activity to the CS+. During retention, the EN ensemble separated the CS+ most differently from the CS- and control odors âˆ¼140 ms after stimulus onset. The learned behavioral response appeared âˆ¼330 ms later. It is concluded that after memory consolidation, the ensemble activity of the MB output neurons predicts the meaning of the stimulus (reward) and may provide the prerequisite for the expression of the learned behavior.