| V. Natural & Analog Computation |
| A Very Brief Tour of Real Neurons |
| (and Real Brains) |
| Slide 3 |
| Left Hemisphere |
| Typical Neuron |
| Grey Matter vs. White Matter |
| Neural Density in Cortex |
| 148 000 neurons / sq. mm | |
| Hence, about 15 million / sq. cm |
| Cortical Areas |
| Neural Representations |
| Macaque Visual System |
| Hierarchy of Macaque Visual Areas |
| Bat Auditory Cortex |
| Neurons |
| Typical Neuron |
| Dendritic Trees of Some Neurons |
| inferior olivary nucleus | |
| granule cell of cerebellar cortex | |
| small cell of reticular formation | |
| small gelatinosa cell of spinal trigeminal nucleus | |
| ovoid cell, nucleus of tractus solitarius | |
| large cell of reticular formation | |
| spindle-shaped cell, substantia gelatinosa of spinal chord | |
| large cell of spinal trigeminal nucleus | |
| putamen of lenticular nucleus | |
| double pyramidal cell, AmmonŐs horn of hippocampal cortex | |
| thalamic nucleus | |
| globus pallidus of lenticular nucleus |
| Axonal Terminations (Tectum of Turtle) |
| Axonal Net |
| Layers and Minicolumns |
| Slide 19 |
| Neural Networks in Visual System of Frog |
| Frequency Coding |
| Variations in Spiking Behavior |
| Chemical Synapse |
| Action potential arrives at synapse | |
| Ca ions enter cell | |
| Vesicles move to membrane, release neurotransmitter | |
| Transmitter crosses cleft, causes postsynaptic voltage change |
| Typical Receptor |
| Axon Hillock |
| Dendrite & Dendritic Branches |
| Dendrite & Dendritic Spine |
| Neuropil |
| Myelinated Axon Making Synapse on Dendrite |
| Various Synapses |
| Excitatory Synapse Between Axon Terminal and Dendritic Thorn |
| Dendro-dendritic Synapses |
| Electrotonic Synapse |