[Eeglablist] Possible issue with interpolation in updated v. 9.0.5.6b

[Daniel Roberts]

After the recent announcement of the channel interpolation bug in previous
versions of EEGLAB 9, I updated from v.9.0.4.5s to v.9.0.5.6.b. However, I
now seem to be experiencing an interpolation bug with the new version, even
when using datasets in which no channels have been removed.

For testing purposes, I created a study with a single subject, with all (32)
channels intact. In the attached PDF are topographic plots from v.9.0.4.5s
and v.9.0.5.6.b, with channel interpolation both on and off. It seems that
although this subject has no missing channels, keeping the "spherical
interpolation of missing channels" check box selected when pre-computing the
subject data scrambles the topography of the channels (this check box is
selected by default). I've had similar results in v.9.0.5.6.b when
pre-computing data in a study in which some subjects had channels removed.

Has anyone else had similar issues? While this subject has all of their
channels intact, 2 artifactual ICs were removed from the dataset prior to
creation of the .study.

thanks
Dan

Daniel Roberts
Graduate Student
Human Factors and Applied Cognition
George Mason University
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