Explore the words cloud of the IN VIVO MOSSY project. It provides you a very rough idea of what is the project "IN VIVO MOSSY" about.
The following table provides information about the project.
INSTITUTE OF SCIENCE AND TECHNOLOGYAUSTRIA
|Coordinator Country||Austria [AT]|
|Total cost||166˙156 €|
|EC max contribution||166˙156 € (100%)|
1. H2020-EU.1.3.2. (Nurturing excellence by means of cross-border and cross-sector mobility)
|Duration (year-month-day)||from 2016-04-01 to 2018-03-31|
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|1||INSTITUTE OF SCIENCE AND TECHNOLOGYAUSTRIA||AT (KLOSTERNEUBURG)||coordinator||166˙156.00|
A commonly repeated maxim is that an individual cortical neuron receives synaptic input from tens of thousands of presynaptic partners, with each individual connection carrying only minor weight. In that case, concerted firing by many presynaptic neurons is required to cause an action potential in the postsynaptic neuron. However, there is inconclusive evidence that the mossy fiber synapse (the second connection in Cajal’s heavily studied “trisynaptic circuit” of the hippocampus) is powerful enough to translate a single presynaptic spike into a postsynaptic spike - termed “detonation”. If true, this would have substantial implications for our understanding of learning and memory, spatial navigation, and pattern recognition. I propose to use simultaneous two-color, two-photon calcium imaging of presynaptic mossy fiber terminals and postsynaptic CA3 pyramidal neurons in awake mice navigating along a linear track, in order to conclusively confirm or rule out the detonation hypothesis. This preparation will allow me to distinguish between detonator, conditional detonator, and subdetonator synapses, and more generally to quantify the number of simultaneously active mossy fiber boutons necessary to cause CA3 spiking during behavior. These results would have substantial implications for established models of associative memory and spatial navigation, and more generally for information transfer in the hippocampus. Furthermore, the techniques developed will permit future studies whereby the conjunctive effect of additional inputs (e.g. from entorhinal cortex, and local interneurons) can be studied by optogenetic manipulation.
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