ERPs are used to answer questions about the timing of information processing in the brain.
Questions we ask....
When are the neural processes and representations activated that enable people to perceive, comprehend, learn, and remember information about the visual environment (e.g., people, places, and objects seen)?
How we answer these questions....
We record 32 and 64-channels of EEG using sintered Ag/AgCl electrodes attached to plastic caps from Electro-cap International, Inc.. Electrodes are arranged in a custom geodesic configuration optimized for source localization in vision and memory research. EEG is recorded from a SA Instrumentation bioamplifier in a Lindgren double electrically shielded room. Inside, participants sit in a comfortable chair and see visual images on a 21" CRT monitor while they perform simple visual tasks. Outside the EEG recording chamber, a stimulus presentation computer controls the behavioral task, and a digitization computer records to disk and converts the EEG signal from analog to digital. The stimulus computer has high quality graphics and sound cards to enable a wide range of visual (and auditory), learning, and memory tasks to be investigated. EEG data are analyzed and ERPs are computed on several desktop, workstation, and laptop computers using Windows software available from the NeuroCognition Lab at Tufts University.
ERP data are also combined with functional magnetic resonance imaging (fMRI) data to define the spatiotemporal dynamics of vision and memory.
Recording 64 channels of EEG
in the Vision & Memory Neuroimaging Lab
Example of Vision & Memory ERPs
