亚马逊做 Kindle，是典型的互联网思维：硬件不赚钱甚至亏钱卖，靠卖内容来回血，但这在中国完全行不通。
Allocate in arenas, free all at once
，这一点在PDF资料中也有详细论述
Among non-invasive neuroimaging modalities, fMRI offers the best spatial resolution, which enables detailed localization of brain activity. Unlike invasive recording methods, it can also cover the whole visual system and the whole brain and can easily be recorded in healthy humans. fMRI is slow however, the sampling rate (TR) usually being in the range of seconds, which impacts continuous stimuli such as video.
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