The human brain has a larger and far more expanded neocortex than primate ancestors. As brains get more complex, stronger mental demand also fuels further growth. Being this big, it also eats almost 20% of the energy of our body.Д«rains also get larger when there is more mental demand. According to our body mass, it should be six times smaller than it is. If we look at the human body, the brain is he in relation. Variability of brain size and in different animal species. The brain centers where cells classes can be measured with data to include: the cerebellum, the olfactory bulb, and the optic tectum.Д«rains use different tools as they evolve and become more complex. There are more cell classes in the cerebral cortex of a mammal than in the entire neural system of a lamprey. ItвЂ™s best illustrated in the forebrain, particularly the cerebral hemispheres. Brain size increases with body size, although this increase is not proportional.Д«oth birds and mammals have brains that are 6вЂ“10 times larger than the brains of reptiles of the same body size.ДЄn increase in neural centers with an increase in relative brain size allows new functional areas of the brain.ДЄs brains increase their neural centers, they are able to process and transfer far more information. In most vertebrates, brain size varies approximately 10-fold. The relationship between brain size and body size is highly ordered. The evolution of consciousness is related to ways that brains become more complex in nature. The reptilian brain compared to mammals lack the outer cerebral cortex. Evolution has changed the shape and function of the brain. That then assisted in the evolution of a вЂconsciousвЂ™ neural system.ДЄs creatures evolve, brain complexity increases. The tectum allowed vertebrates to develop complex neural systems. It then combines this information together as вЂattentionвЂ™ to the environment. That helps a creature to aim the satellite dishes of the eyes, ears, and nose toward anything important. Also, it organizes something called overt attention. It acts as a central controller for attention that coordinates sensory input. вЂњTectumвЂќ means вЂњroofвЂќ in Latin, and it often covers the top of the brain. Even lampreys have one, which is an ancient, jawless fish.

ItвЂ™s the presence of the tectum that separates vertebrates from invertebrates.ДЄll vertebrates-fish, reptiles, birds, and mammals-have a tectum. In all vertebrates, the forebrain vesicle initially forms a simple hollow tube.

The spine or skeletal system is necessary to house a complex immune neural system. Vertebrates are unique from invertebrates due to the presence of a skeleton. This is when vertebrates were tiny wriggling creatures competing with a vast range of invertebrates in the sea.ДЇossil and genetic evidence reveal vertebrates evolved around 520 million years ago. Is the tectum the source of the evolution of consciousness?Д¬onsciousness is thought to have evolved during the Cambrian Explosion.

Project magenta human evolution