Piers Cornelissen ASC - Wednesday 14th May - 4pm B020.

Dear all, Piers has forwarded to me the following agenda for the YNiC ASC tomorrow, Wednesday 14th May. Just to remind you, this will take place in Psychology room B020 at 4pm. Michael -- Dear all, We have just finished some preliminary analyses of MEG data collected from a fast phonological priming task (e.g. brane priming BRAIN, versus brone priming BRAIN) that I would like to report and discuss. The reason for doing the experiment, as many of you know, is that I have wanted to get some clearer insight into the role of the very early activation we have seen across a number of experiments, in left post. sup. IFG and adjacent precentral gyrus during visual word recognition tasks. Initial results from the group analysis of beamformed images within experimental conditions were very encouraging - a real yippee moment. However, once we started analysing virtual electrode data to compare directly between experimental conditions, things become a bit more prickly. While we currently have some results which I think are convincing, I would really like to discuss the issues that have been raised especially regarding the group comparisons of Stockwell transforms, such as: a) For comparisons of Stockwell plots at the group level should we compare differences or percentage signal change between conditions? b) How should we handle the (in our case) quite marked inter-subject variability? c) Should we consider some kind of normalisation between pairs of conditions prior to statistical analysis? We would really appreciate your thoughts on these and other questions, and your opinions about how best to proceed, Best Piers C -- Dr Michael Simpson Science Liaison Officer York Neuroimaging Centre Innovation Way York YO10 5DG Tel: 01904 567614 Web: http://www.ynic.york.ac.uk