OpenViBE forum

Hi,

I am currently working with the xDAWN P300 speller scenarios in Openvibe v.2.2.0. Everything works fine, however, I would like to extract the spelling accuracy (i.e. the ratio of correctly classified letters) from the P300 speller at the end of each run.

Is there an easy way to extract this information?

Thanks in advance!

Sandra

I solved it by comparing the selected row and column (provided by the P300 accumulator box) with the target row and column (provided by the Target Letter Generation box) in a Matlab script. If they match, a score is incremented by 1. At the same time, I count how many letters are in the run by incrementing a counter any time a Trial Stop stimulation occurs. At the end of a run, the spelling accuracy is calculated by dividing the score by the letter count.

Sandra