fMRI brain scans are coming frighteningly close to opening a window into our thoughts.
Scientists are increasingly working out that the body actually shapes the mind. New research even raises hopes about new treatments for mental health problems.
We cannot think thoughts that are not ours - but there are still those who claim to have external thoughts being put into their heads.
Different parts of our brains process different things, like the facial features, voices and the gait of people we know. But it takes memory to weave them all together into a single picture.
Insects have similar structures in their brains as do we, and that might mean that have a basic form of consciousness.
Consciousness is one of the most mysterious phenomena we know of. But evidence is emerging that it might just be a very special kind of information processing.
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