Doubt

Doubt is a result of having in the mind more than one models applicable to the current situation. Some of our brain models are built-in from birth, or develop in a short time after the birth. We can hypothesize that such models tend to be applicable in a unique way, so they do not invoke doubt. Other models develop in the process of life and are determined by our experience. It may well be that at different times two or more non-verbal models were developed which can be applied in the current situation. We perceive this as doubt. This meaning of the word 'doubt' is reflected in its etymology. 'Doubt' is, apparently descending from 'double', meaning a double opinion. In the Russian language the word for doubt is 'somnenie', which breaks down as 'so-mnenie', literally co-thought, a parallel thought.