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In general, closely situated electrodes work well to eliminate environmental noise, at least when a differential amplifier is used. Environmental noise is a major problem in case of scalp-recorded signals, think of the electromagnetic distortions caused by electronical devices situated in the vicinity of your recordings. But also muscle artifacts are a ...
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I wasn't able to find the exact figure in the literature or in the webpages you linked, but the pages you link include a web page with references, including a PLOS paper from the University of Liege on tinnitus that is closely related to your current question and from a group affiliated to the same academic institution (Maudoux et al., 2012).
This paper ...
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