A Functional Classification of Glutamatergic Circuits in Cortex and Thalamus
summary
Using slice physiology with laser glutamate uncaging, the talk claims glutamatergic synapses split into two functional classes: drivers (large, proximal terminals, ionotropic-only, depressing, carry the main signal—often <5% of inputs, e.g. retinal→LGN or cortical layer 5→pulvinar) and modulators (thin axons, distal dendrites, facilitating, recruit metabotropic glutamate receptors, ~40–50% of cortical synapses). Modulators are topographic, change driver gain, can excite or produce long IPSPs, and control thalamic burst versus tonic firing; examples include auditory core vs shell and layer‑6 feedback effects.
AI-written summary · about
chapters (16)
- 0:00Introduction
- 1:38Outline
- 2:43Thalamus
- 9:47Postsynaptic receptors
- 13:29Metabotropic component
- 15:40Summary
- 22:28Textbook View
- 25:11Basal ganglia
- 27:06Dynamic basal ganglia
- 28:36Properties of glutamatergic modulators
- 29:52Metabotropic glutamate receptors
- 30:44Monocyte achill staining
- 32:48Modulation of driver inputs
- 34:37Summarize
- 35:51Conclusion
- 38:32Question
related talks
01h 13mComputation in Networks of Neurons in the Brain II
27mWhat can artificial neural networks learn from biological neuromodulatory systems?
31mNeuromorphic computing in spiking neuron-astrocyte networks
30mCracking the code: neuronal networks in the brain
57mWhat Should a Computational Theory of Cortex Explain?
11mTo Boldly Grow... Live Brain Cells that Learn to Play Pong
24mHigh-throughput cellular analytics to identify central nervous system targets for gene therapy
58mStrong Generalization from Small Brains and No Training Data