PAIN

1. important function of brain

1.1. tells body something is wrong

1.2. response to a STIMULUS

1.2.1. stimulus = thing that causes REACTION

2. 3 KINDS OF STIMULI

2.1. 1. MECHANICAL

2.1.1. physical pain like cuts, bruises, muscles aches

2.2. THERMAL

2.2.1. burn

2.3. CHEMICAL

2.3.1. pain caused by chemical reaction like hot pepper spray

3. BRAIN PROCESSING

3.1. body exposed to pain

3.1.1. nociceptor sends signal to brain

3.1.1.1. brain processes

3.1.1.1.1. pain is felt

3.1.2. nociceptor = cell that perceives painful stimuli

3.2. happens faster than brain can perceive

4. necessary for survival

4.1. disorder - "congenital insensitivity to pain"

4.1.1. can be life threatening

4.1.2. causes inablitiy to recognize when body needs to rest or heal

5. brain can be tricked

5.1. sensory info can make brain process pain that is not there