Is consciousness a gradual phenomenon? Evidence for an all-or-none bifurcation during the attentional blink
Is consciousness a gradual phenomenon? Evidence for an all-or-none bifurcation during the attentional blink
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DOI：
10.1111/j.0956-7976.2004.00748.x
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发表时间：
2004-11-01
影响因子：
8.2
通讯作者：
Dehaene, S
中科院分区：
文献类型：
--
作者：
Sergent, C;Dehaene, S
一些关于意识神经关联的理论假设，感知存在连续性，与大脑激活强度的逐渐变化相关。但一些模型认为神经活动的混响是有意识感知所必需的，预测无意识和有意识处理之间会出现急剧的非线性转变。我们要求参与者在注意力瞬脱期间连续评估目标词的可见性，众所周知，这会妨碍明确的报告。参与者以全有或全无的方式使用这种连续量表：在眨眼期间出现的目标要么被识别，要么在眨眼周期之外出现的目标被识别，或者根本没有被检测到。我们认为，神经活动中的随机非线性分叉是在注意眨眼期间观察到的全有或全无感知的基础。
Several theories of the neural correlates of consciousness assume that there is a continuum of perception, associated with a gradual change in the intensity of brain activation. But some models, considering reverberation of neural activity as necessary for conscious perception, predict a sharp nonlinear transition between unconscious and conscious processing. We asked participants to evaluate the visibility of target words on a continuous scale during the attentional blink, which is known to impede explicit reports. Participants used this continuous scale in an all-or-none fashion: Targets presented during the blink were either identified as well as targets presented outside the blink period or not detected at all. We suggest that a stochastic nonlinear bifurcation in neural activity underlies the all-or-none perception observed during the attentional blink.