A post by Angelica Kaufmann
“Our heart-beats, our breathing, the pulses of our attention, fragments of words or sentences that pass through our imagination, are what people this dim habitat. … In short, empty our minds as we may, some form of changing process remains for us to feel, and cannot be expelled.”
— William James, The Principles of Psychology, Vol. I, Ch. XV, “The Perception of Time,” section “We have no sense for empty time”
Mental life is not always equally full or equally structured. Sometimes thought is busy, vivid, and difficult to interrupt. A useful example is intrusive mental imagery. In conditions such as post-traumatic stress disorder, anxiety disorders, and obsessive-compulsive disorder, intrusive images can be especially vivid, affectively charged, and hard to regulate (Brewin et al., 2010). They show one way in which some conscious experience can become highly salient and difficult to step back from.
But some conscious mental life can also seem to vary in the opposite direction. Sometimes, instead of becoming overly full, it appears to lose structure altogether. Many people recognise the experience: you are reading a page, listening to someone speak, or waiting at a traffic light, and then suddenly realise that your mind seems to have gone blank. Not wandering somewhere else. Not replaying a memory. Not imagining tomorrow’s lunch. Just — nothing.
Or at least, that is how it seems.
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