The EEG-Lab is located in one of the custom-built laboratory booths of the Phonetics Lab and consists of an electrically insulated, sound-attenuated recording booth and an adjacent control room. The lab owns two separate EEG-systems:

The high-impedance 128-electrodes EEG-system from EGI can be used in combination with eye-tracking and is permanently set up in the lab. This system enables quick, gel-free application of dense array electrodes in a net and is therefore optimal for infant and patient participants. In addition, it provides the possibility to run topographical ERP analyses.

The high-impedance EEG-system from BioSemi is compact and mobile. In this system, 16 to 24 active electrodes can be applied using conduction gel, generating a high signal quality in each channel. We use this system currently at preschools within the Stockholm area to study the neural correlates of children’s attention.

Both EEG-systems use E-prime for stimulus presentation. Recorded EEG is processed and analyzed using Net Station and MATLAB packages such as EEGLAB, ERPLAB, EP-toolkit or RAGU.

At the EEG-lab, we predominantly use the ERP components Mismatch Negativity (MMN) and N400. The MMN reflects discrimination and memory traces. We use it for example to study development of speech sound categorization in infants and to probe semantic information in adults’ prosodic processing in English, Turkish and Swedish. The N400 is a response to deviation from anticipated meaning. We use it to study how ambiguous sentences are understood, how toddlers attach meaning to words and how children with cochlear implants process meaning.