Hind Brain Model
Approximately 500 million years ago the first brain structure appeared in reptiles. This structure was referred to as the hind brain. It can still be seen in animals such as insects, worms, and snails. The hind brain is responsible for movement, breathing, balance, and the regulation of the heart beat. This section of the brain still exists in modern brains, it is called the protoreptilian brain. As time passes and evolution continues to make process, this basic section of the brain does not change. Things are added to it and it now possesses more abilities than it did in the Cambrian time period, but it also has the same capabilities that it had in the past. The protoreptilian brain in humans interacts with the limbic system, and the neocortex.
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MacLean. It consists of three parts. The first is called the R-Complex or the reptilian brain. This section is responsible for temperature control, hunger, and the flight-or-flight response. These are instinctual things that are necessary for all organisms with brains. The next brain system is the Limbic system or the mammalian brain. This first developed in mammals; it is responsible for memory, mood, and hormone control. The last brain area in this model is the neocortex (also called the primate brain). The neocortex controls logic, language, planning, and social interaction. This is just one brain model, but from an evolutionary viewpoint, it makes the most …show more content…
While they were able to make a few stone tools, they did not make very complex tools. Most of them were not capable of making fire or traveling long distances. Their brains had not developed to the same point that ours have, and they were much smaller. Their brains were approximately 600 cubic centimeters. In comparison, ours are 1400 cubic centimeters. While brain size is not always an indicator of intelligence, relative brain size compared to body size can be linked to it. For example, the blue whale as one of the largest brains of any mammal (6 kg), but it is only .01% of their body. The human brain however is much smaller (1.4 kg), but it is approximately 2% of our body weight. It also uses almost 20% of our resources [blood, oxygen, etc.] Our brain is a fairly large for our body size, which would explain our increase in
MacLean. It consists of three parts. The first is called the R-Complex or the reptilian brain. This section is responsible for temperature control, hunger, and the flight-or-flight response. These are instinctual things that are necessary for all organisms with brains. The next brain system is the Limbic system or the mammalian brain. This first developed in mammals; it is responsible for memory, mood, and hormone control. The last brain area in this model is the neocortex (also called the primate brain). The neocortex controls logic, language, planning, and social interaction. This is just one brain model, but from an evolutionary viewpoint, it makes the most …show more content…
While they were able to make a few stone tools, they did not make very complex tools. Most of them were not capable of making fire or traveling long distances. Their brains had not developed to the same point that ours have, and they were much smaller. Their brains were approximately 600 cubic centimeters. In comparison, ours are 1400 cubic centimeters. While brain size is not always an indicator of intelligence, relative brain size compared to body size can be linked to it. For example, the blue whale as one of the largest brains of any mammal (6 kg), but it is only .01% of their body. The human brain however is much smaller (1.4 kg), but it is approximately 2% of our body weight. It also uses almost 20% of our resources [blood, oxygen, etc.] Our brain is a fairly large for our body size, which would explain our increase in