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キーワード:
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要旨:
It has generally been suggested that one cannot temporally resolve alterations in neural activity in the range of milliseconds using BOLD signal since
hemodynamic response evolves in seconds. However, in this study using ultrashort visual stimulus durations ranging from 5 milliseconds to 1 second we
investigated the hemodynamic response and nonlinearity of BOLD response. We were able to show that 1) a BOLD response to stimulus durations as short
as 5 ms is detectable in humans; b) BOLD responses to different stimulus durations are highly non-linear and c) non-linearities depend not only to stimulus
duration but also on intensity.
