Representation, information, and processing in the brian 2

ganglion cell response was shaped by the synaptic efficacies along the way: some pos (excitation) some neg (inhibition)

retina: where retinal ganglion cells are

primary visual cortex (V1): where visual info first enters cerebral cortex (part of occipital lobe)

1. neurons wiring (which synaptic connections feed into it and what their efficacy) not identity determines what it represents

2. lot of convergence

3. what neurons represent become more and more abstract as we move away from system input side (retina)

retinal receptors represent input image in straightforward “pixel wise” way - representations of ganglion and simple cells are abstractions away from raw input → toward more derived metrics of that input

representation by large groups of neurons together: population/ensemble coding

primary motor cortex (M1); where motor commands are sent to muscles

• neurons appear to respond in associating w a particular direction of limb movement

representation, information processing and the brain 3

retina: receptors and ganglion cells

V1: simple cells

general principles regarding neural representation:

1. neurons wiring not identity determines what is represents

2. lot of convergence - ganglion cells feed into single cell

3. what neurons represent become more abstract as we move away from system input side (retina)