LING 390 Lecture Notes - Oddball Paradigm, Design Matrix, Magnetoencephalography
5 Dec 2012
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Then we create a design matrix containing the timing of the trials and the names of different conditions in ofder to estimate the hemodynamic response function (hrf) After modeling hrf, we can do some statistics to look at where the activation is located for a specific condition. You can look at one particular space. Eeg (electroencephalogram) = coarse measure of brain activity. represents mixed conglomeration of different neural sources of activity (spontaneous activity + erps) Equipment: electrodes, amplifier, computer (funny hat with gel) Coarse eeg = the original little squiggles. Erp (event-related potentials) = electrical potentials associated with specific events; systematic voltage changes in the eeg signal that reflect the brain"s processing of an event. Pyramidal cells with a dipole structure (have positive and negative parts) are the ones that generate. Eeg = change in voltage in post-synaptic neuron. Postsynaptic potentials are confined to the dendrites and the soma of the cell.
