[Pontiac]

Surgery is carried out in which electrodes are inserted into the brain with millimetre precision

.

The author is obviously not a science writer.

Millimetre precision is not nearly good enough for this kind of technology.

When the brain in question is less than 2 centimetres across a millimetre is huge.

I would guess that the tolerances necessary are less than a micrometre.

[alexander_busek]

The author is obviously not a science writer. Millimetre precision is not nearly good enough for this kind of technology. When the brain in question is less than 2 centimetres across a millimetre is huge. I would guess that the tolerances necessary are less than a micrometre.

Good catch!

The average pigeon brain has a volume of about 2 cubic centimeters, and is about the size of a shelled walnut.

A Red Blood Cell (RBC) has a diameter of about 7 micrometers. So I think that you're overestimating the necessary accuracy by one order of magnitude.

Something on the order of 10-12 microns might therefore suffice.

Regards,

[alexander_busek]

They'd have better luck with dolphins:

Regards,