Losange bleu


Do we use only 10% of our brain?

An original quote that has often been misinterpreted is:

"We are making use of only a small part of our possible mental and physical resources" (William James, 1908)

It has nothing to do with saying that we are using only 10% of our brain. Here are a few arguments why this is actually very much unlikely:

Given these arguments, I would say that it is very, very likely that we used 100% of our brain.

However, you can improve both your physical (strength, flexibility, accuracy, cardiovascular, etc...) and mental (attention, memory, motivation, self-esteem, etc...) skills. The brain plasticity is not a myth:

Therefore, I bet that you are using 100% of your brain though you might not exploit 100% of your abilities… :)



Clarke, DD & Sokoloff, L 1999, 'Regulation of cerebral metabolic rate'.

Draganski, B, Gaser, C, Busch, V, Schuierer, G, Bogdahn, U & May, A 2004, 'Neuroplasticity: changes in grey matter induced by training', Nature, vol. 427, no. 6972, pp. 311-312.

Purves, D & Lichtman, JW 1980, 'Elimination of synapses in the developing nervous system', Science, vol. 210, no. 4466, pp. 153-157.

Wiesel, TN & Hubel, DH 1965, 'Comparison of the effects of unilateral and bilateral eye closure on cortical unit responses in kittens', J neurophysiol, vol. 28, no. 6, pp. 1029-1040.