Clone madness

Clone madness was an affliction of clones. If a clone was grown too quickly, the clone's mind would begin to deteriorate, leading to psychosis. The only safe way to avoid clone madness was to grow a clone slowly, generally in incubation for at least a year. The reason for clone madness was a debated issue. Some scientists believed that it was because the body was grown too quickly, and the brain being fed information could not handle the amount of data at such a rate. Others believed that it was due to a "double presence" the clone caused in the Force.

During his campaign against the New Republic, Grand Admiral Thrawn used ysalamir to "push back" the Force around the Spaarti cylinders he was using to create an army. By doing this, Thrawn was able to avoid the clone madness inherent in quickly grown clones.