Question: How come the brain cannot stop actions that we don't want to do? E.g. having a twitch
Asked by gandalfthegrey to Fiona, Joanna on 25 Jun 2010 in Categories: General.
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Joanna
commented on 25 Jun 2010: Actually – Fi – Tourettes is not a twitch. Tourettes syndrome is more commonly defined as a ‘tic’.
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Fiona
commented on 25 Jun 2010: Thanks Jo, I typed that in a rush and didn’t make it clear. Meant muscle twitches are a type of ‘tic’ that can also be seen in Tourettes (which more commonly people associate with saying something they don’t mean) and Tourettes-type muscle twitching is controlled by different nerve pathways to muscle spasms. ‘Tic’ is the scientifically correct term, but people often refer to them as nervous twitches etc.
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Muscle twitchs are generally involuntary spasms so the brain can’t consciously control them. Eyes sometimes twitch when we are tired. There are also some conditions that cause people to have a twitch or even tourettes where they say things they don’t want to. This is thought to be a problem with brain function. I have talked about the causes of Tourettes in one of my old answers.
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Hello again! A twitch is an involuntarily muscle action – a muscle contracts several times in a row in an uncontrolled way. It happens because of a sudden burst of activity in the motor neurons in the brain (cells that control movement) – the motor neuron suddenly fires an electrochemical impulse which a certain muscle in the body responds to.
A common twitch is when the eye-lid flutters for a few seconds (or even a minute) and seems to be ‘pulsing’ – people often have this when they are tired as these sudden bursts of motor neuron activity in the brain are related to emotional moments like tiredness, joy, sadness or stress.
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