I recently got a new card and remembered the PIN spatially. After a few times of typing it in I realised that, though I was typing the digits of the new PIN, I was subvocalising the digits of my old PIN. It was a really odd sensation.
Having said that, I would recognise both PINs as both a string of digits and as a spatial sequence... so that would probably just be another attack vector.
> I realised that, though I was typing the digits of the new PIN, I was subvocalising the digits of my old PIN.
I trained myself to do this on purpose; subvocalising a different number. If I'm drugged out in a hospital bed and someone asks for my CC PIN, I want them to get an incorrect number.
Having said that, I would recognise both PINs as both a string of digits and as a spatial sequence... so that would probably just be another attack vector.