Chunk #28 — Materials and Method — Defining the variables of interest — P1 amplitude and latency

Source

Increased intra-participant variability in children with autistic spectrum disorders: evidence from single-trial analysis of evoked EEG.

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A number of variables were calculated from the three sources of data. In line with conventional ERP analyses, P1 amplitude was given by the highest (peak) amplitude between 100 and 170 ms; P1 latency was given by the time of this peak from stimulus onset. For the single-trial analyses, the highest amplitude between 100 and 170 ms was identified in each trial; P1 amplitude was calculated as the median amplitude value, P1 latency was calculated as the median time at which these single-trial peaks occurred.