When people are put in positions of power, their voices automatically change - it becomes lowered in pitch variability and more monotone. In other words, you inadvertently become another person.

According to a study from Columbia School of Business, their voices become dynamic but in control.

Here's an example of Margaret Thatcher before and after she became Prime Minister of UK.

Power basically changes people's basic psychological state.

It reduces the stress hormone cortisol, activates the action-oriented part of the brain and raises confidence levels.

Power. It really is an interesting thing.