110B lect 8 methods

110B lect 8 methods - Single unit recording ' Earlier work...

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Unformatted text preview: Single unit recording ' Earlier work with anesthetized monkeys was good for analyzing early vision and hearing, but the method is very molecular, making it hard to get the big picture * More modern work with awake behaving monkeys reveals neural functioning much closer to conscious experience; as such, the neurons and their responses reflect more complex functioning not so tied to retinal stimulation ' In rare situations, cortical neurons can be recorded in humans undergoing brain surgery (e.g., for epilepsy) Lesioning studies - Experimental lesions in non-human species produced by surgery, anesthesia, and neurotoxins - Lesions in humans produced by genetic malformations, accidents, exposure to toxic substances Auditory evoked potentials (subcategory of “event-related potentials”) Many scalp electrodes are used to measure the summation of post— synaptic activity of auditory neurons in brainstem and in cortex Spatial resolution, even for regions near the scalp surface not very good, and a challenge to record from deeper regions; however methods are improving Temporal resolution is superb, compared to fMRI Relativer low cost compared to flv’lRl Can be used with infants and other people unable to communicate Functional magnetic resonance imaging (fMRI) - high spatial resolution - low temporal resolution * soanner makes a lot of noise so need to use noise-oanoeling earphones or turn off soanner during stimulus presentation and turn back on to measure response Input/output analysis (psychophysical/behavioral methods) processes underlying walkifig action (e.g.. motor) thmwmg / etc. acoustic _ CDH§CIous stimulus EUd'tDW System audltory EXPENEI‘ICR verbal report Cogniti‘v’e JUdgment button pressing etc. Observe relationship between input and output 3 levels of psychophysics (input/output analysis) * Natural stimuli with complex description as response (e.g. describing what a piece of music sounds like) * Controlled stimuli with a response that is partially constrained e.g. walking to the location of a sound source after it has been turned off e.g., direct scaling I -----—-—|- - - I 'JU (3": 3'0 iii? ’50 |"' Lew} I'd“ HE'lJ * Carefully designed, controlled stimuli with very constrained response (analytical psychophysics) ...
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110B lect 8 methods - Single unit recording ' Earlier work...

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