Science consists in grouping facts so that general laws or conclusions may be drawn from them. —Charles Darwin Sleep is a complex state controlled by a number of different brain chemicals. In aged individuals, these brain chemicals may not be made in as great a quantity as in youth. Brain cells may become less sensitive […]
Death from helplessness has been widely observed in animals and people. In one study, wild rats forced to swim until exhaustion lasted for 60 hours before they drowned. Rats that were first held firmly in the investigator’ hand until they stopped struggling, and were then put in the water, swam frantically for about 30 minutes, […]
Catecholamines are responsible for a number of different effects in normal humans. They are involved in control of locomotor (moving about) behavior, aggressive behavior, sexual behavior, food intake, and behavior dependent upon positive (reward) and negative (punishment) reinforcement. Acetylcholine controls muscle tone and motor activity and has a role in memory, learning, and long-term planning, […]
Read more The Decline of Your Brain’s Chemical Messengers III