1 Touch Response: The keys on a digital piano or keyboard can be weighted (similar to those of a traditional piano), touch sensitive (unweighted but still sound loud when struck hard), or neither.
In very rare instances, eyelid twitching can indicate a more serious condition, like the beginning stages of multiple sclerosis or a lesion on the brain stem. Those conditions typically begin with a host of symptoms, and in this circumstance the eyelid twitch soon moves to the facial muscles, as well.
The twitching can last from a few seconds to a few minutes and can come back unpredictably. While most cases are not severe, they can be bothersome. Here are some of the most common reasons why an individualâs eye may start to twitch suddenly. Stress. One of the primary triggers of eye twitching is often cited as stress. Experts believe that the twitching motion is a way for the body to tell the individual that they are tired or stressed.