Quadriceps Setting. This exercise helps to strengthen the quadriceps muscle (the big muscle on the front of the thigh), an important stabilizer of the knee. click to enlarge. Lie on your back with the leg you want to exercise straight. Place a small rolled towel underneath the knee.
Hallucinogens can cause an excited catatonic state, including 3,4-methylenedioxymethamphetamine (ecstasy) and phencyclidine (angel dust). Carbon monoxide poisoning can cause catatonia due to damage to the basal ganglia.
A brain chemical, dopamine, is also thought to be involved in the causes of schizophrenia. Effective antipsychotic medications (medications which reduce psychosis) inhibit the neurons that fire this chemical while drugs that exacerbate dopamine firing are known to induce psychosis.