Earth's shadow has two main regions: the outer shadow, called the penumbra, and the inner shadow, known as the umbra. The penumbra causes faint dimming that can be hard to notice. But the umbra is much darker. As it sweeps over the moon, the eclipse becomes obvious and the darkened portion spreads until the entire moon is covered.
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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