'Lucid Interval' may be seen in -

The synopsis of forensic medicine & toxicology; Dr k.s narayan reddy; 28th edition; pg.no. 144& 266 Lucid interval is seen in insanity during which all the symptoms of insanity disappear completely . It is also seen in extra dural hemorrhage ,subdural haemorrhage (if there is lucid interval this may be longer than average of 4 hours in extradural hemorrhage.)