oddball - fMRI Course: Processing of Functional Magnetic...

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fMRI Course: Processing of Functional Magnetic Resonance Imaging Data Auditory Oddball Task 1. Introduction Functional Magnetic Resonance Imaging (fMRI) data shows localized hemodynamic changes related to neuronal activation. A 3D image is collected every few seconds during the performance of a task. The task timing information can be used to analyze the fMRI data. For this competition data set, you are asked to analyze data collected during the performance of an auditory oddball task. Data from two different runs (which are typically averaged together) are provided alone with the paradigm timing files for each run. The auditory oddball task is a paradigm in which infrequent, task-relevant target ‘oddball’ stimuli are interspersed with infrequent task- irrelevant novel stimuli and frequent standard stimuli. Target Novel Standard Standard Standard Standard 1kHz tone, sweep, whistle Standard 0.5 kHz Standard Auditory Oddball Paradigm (left) and fMRI maps for target versus standard stimuli (right) A picture of the auditory oddball task and a target time-locked average is presented above. Typical approaches to pre-processing these
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This note was uploaded on 02/10/2010 for the course TBE 2300 taught by Professor Cudeback during the Spring '10 term at Webber.

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