[Eeglablist] baseline for short trial durations

Ahmad, Jumana jumana.ahmad at kcl.ac.uk
Wed Jan 4 04:03:54 PST 2017

Dear all,

I am analysing data from a MMN oddball experiment with:

Standards, 1000Hz 50ms tone; and deviant, 1000Hz, 100ms

The SOA is a random 500-600ms, so includes the tones (i.e. doesn't get longer when the duration is longer).

I want to calculate ERPs and ITC. What duration would you recommend for a baseline?

I am trying to avoid subtracting as much experimental related activity as possible, and as I am focusing on the MMN which occurs fairly early (let's say before 300ms), I wondered if I should subtract a -100ms baseline. Is this long enough for ITC. Sampling rate is 1000Hz, in most of data (I have 600 datasets, and 10% used 256Hz which of course I have used different filter lengths for etc.). Ideally I would look at the P3 but my trials may not be long enough.

Thank you,

Jumana Ahmad
Post-Doctoral Research Worker in Cognitive Neuroscience
Room M1.09. Department of Forensic and Neurodevelopmental Sciences (PO 23) | Institute of Psychiatry, Psychology & Neuroscience | King's College London | 16 De Crespigny Park | London SE5 8AF

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