Large fonts allow reading at greater distances, giving the viewer more time to process your message. When designing billboards, minimum type size should be 18 tall, with 3' and taller being optimal. Humungous type not only aids readability but adds life to your message.
The definition of stammer is to stutter or to speak with involuntary pauses and often where the first sound of each word is repeated. When you are feeling really shy and intimidated and you can't get words out and so you say I th... th... th... think, this is an example of a time when you stammer.
Convulsive syncope is a term to describe a situation when a person passes out (syncope) and exhibits jerky movements of the limbs (convulsion). Both of the symptoms reflect inadequate blood--and oxygen--to your brain due to sudden drop in blood pressure when you stand up. The convulsions reflects that brain cells with not enough oxygen misfire into neighboring brain centers. I have low blood pressure ... and I sometimes feel dizzy if I get up quickly.