Ch. 6 notes

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University of Toronto Scarborough
Steve Joordens

- Stimuli of various shapes was presented Ch. 6 Perception Perception: the process by which we recognize to detect which one created the greatest neuron response what is presented by the information provided by our senses. Conclusion: - Geography of the visual field is retained - A rapid, automatic, unconscious process - We dont feel the process of perception in: primary visual cortex - Surface of retina: mapped on surface of - We are just presented with the final primary visual cortex product - Map is like tiles containing pieces of the Problem solving: when we see something we dont entire picture know and we gather evidence to decide what it is Module(tile): blocks of tissue with approx. 150 000 neurons Brain Mechanisms of Visual Perception - Each module receives info from a small Visual perception: hierarchy of information region retina processing - Neural circuits in each module analyze - Circuits of neurons analyze particular dif. characteristics of their own particular aspects of visual information part of the visual field - Results are sent to another circuit Receptive field: part of the visual field where - Further analysis is performed the firing rate will be altered by the presentation - More and more complex features are of a stimuli analyzed Ex. - Higher process interact with memory - One module sees a line Primary Visual Cortex - Some circuits in module detect the present Knowledge in earliest stages of visual analysis of lines has come from: - Other circuits orientation of these lines - Investigations of the activity of individual (angle) neurons in the thalamus and the primary - Other circuits detect width visual cortex - Other circuits detect colour - Inserting small electrodes into various Therefore, orientation of lines passing through regions of visual systems of cats and the receptive field is signalled by an increased monkeys rate of firing of particular neurons in the cluster - ^ Action potentials created by individual neurons were studied The Visual Association Cortex Two streams of visual analysis: Process: 1. (recognition of objects and colour, WHAT) - Animal anaesthetized with eye open a. Ventral stream: Perception of Form - Electrode inserted close to a neuron - recognition of visual patterns + identification of - Animal placed in front of a screen - Stimulus presented on screen particular objects takes place in the inferior temporal cortex - Position of stimulus moved around to detect the location that created the largest - Inferior temporal cortex: located at the end of ventral stream effect on the electrical activity of the neuron
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