G9 Chapter 3 Neural Processing and Perception Play VL 3.7 Receptor Wiring and Sensitivity as a review of end of last lecture – cells in the retina. Not covered specifically in G9 We’ll first follow the neural activity upwards toward the brain along the receptor -> bipolar -> – ganglion pathway. Recall the side view of the retina . . . The Bipolar So called because it’s difficult to tell which is the end and which is “receiving” the end. They transmit information from the receptors to the ganglion cells. “sending” Why do they exist? Perhaps to provide extra synapses between the receptors and ganglion cells.?? Many of these synapses are of the type discussed in the previous lecture. That type is the basis “comparative” for neural “thinking”. The first synapse receptor bipolar synapse heightens contrast. The process by which –the –> this is accomplished is called The lateral message is carried by the horizontal lateral inhibition. cells. The second synapse bipolar ganglion synapse may allow a completely different type of –the –> comparison, perhaps more global, perhaps comparisons. wavelength This is pretty much the way things are in the brain the comparisons, decisions, of – “thinking”, the brain is done in the synapses. Contrast heightening through Lateral Inhibition Horizontal Cells schematic view of the essential circuitry –
G9 Chapter 3 Neural Processing and Perception Play VL 3.7 – Receptor Wiring and Sensitivity as a review of end of last lecture cells in the retina. Not covered specifically in G9 We’ll first follow the neural activity upwards toward the brain – along the receptor -> bipolar -> ganglion pathway. Recall the side view of the retina . . . The Bipolar So called because it’s difficult to tell which is the “receiving” end and which is the “sending” end. They transmit information from the receptors to the ganglion cells. Why do they exist? Perhaps to provide extra synapses between the receptors and ganglion cells.?? Many of these synapses are of the “comparative” type discussed in the previous lecture. That type is the basis for neural “thinking”. The first synapse –the receptor –> bipolar synapse heightens contrast. The process by which this is accomplished is called lateral inhibition. The lateral message is carried by the horizontal cells. The second synapse –the bipolar –> ganglion synapse may allow a completely different type of comparison, perhaps more global, perhaps wavelength comparisons. This is pretty much the way things are in the brain – the comparisons, decisions, “thinking”, of the brain is done in the synapses. Contrast heightening through Lateral Inhibition Horizontal Cells – schematic view of the essential circuitry