The Americas, Europe, and Asia and Australia were 'conquered' by PEBL long ago. Africa was elusive; several years back, I remember reading a paper from some on-line journal of psychology from some African nation that possibly used PEBL, but I didn't save the reference and can no longer find it, or even remember what the journal was. But a 2012 paper by Lucas and Buchanan compared some executive function tests in PEBL to a manual 'Tinker Toy Test'.
Then, what looks to be an Indian journal called the "Neuroscience Journal" published a study by Premkumar et al (2012), who used PEBL to study cognitive function over a year in residence in Antarctica. http://www.hindawi.com/journals/nj/aip/254090/ http://www.hindawi.com/journals/nj/aip/254090.pdf. Thus, all seven continents are represented.
What is more, a conference paper by Hurdiel et al (2011) measured fatigue from sleep deprivation on offshore sailing races--on no continents at all.
Of course, there is one 'last frontier': Space. Some years ago, researchers at NASA were using PEBL to test their fNIRS set-up, but this certainly flew to the stars. With the future of space travel being robots, this may be a frontier we never reach.
Hurdiel R., McCauley P., Peze T., & Theunynck (2011). Sleep deprivation, performance and mathematical prediction of fatigue in offshore sailing races. The 14th International Congress of ACAPS (Association des Chercheurs en Activités Physiques et Sportives), October, 2011. http://www.congres-acaps.org/images/stories/Publications/hurdiel-a.pdf
Lucas, M., & Buchanan, C. (2012). The Tinker Toy Test as a measure of the dysexecutive syndrome in those from differing socio-economic backgrounds. South African Journal of Psychology, 42(3), 381-388. http://content.ebscohost.com/pdf27_28/pdf/2012/SOP/01Sep12/79962078.pdf
Premkumar, M., Sable, T., Dhanwal, D., & Dewan, R. (2012). Circadian levels of serum melatonin and cortisol in relation to changes in mood, sleep and neurocognitive performance, spanning a year of residence in Antarctica. Neuroscience Journal.