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The brain is the center of the nervous system in all vertebrate, and most invertebrate, animals. Some primitive animals such as cnidarian and echinoderm have a decentralized nervous system without a brain, while sponges lack any nervous system at all....
size of the average cat is 5 centimeters in length and 30 gramGram
The gram , ; symbol g, is a Physical unit of mass.Originally defined as "the absolute weight of a volume of pure water equal to the cube of the hundredth part of a metre, and at the temperature of melting ice" , a gram is now defined as one one-thousandth of the SI base unit, the kilogram, or Scientific notation kg, which itself is...
s. Since the average cat is 60 cm long and 3.3 kg, the brain makes up 1/12 of its lengthLength
Length is the long dimension of any object. The length of a thing is the distance between its ends, its linear extent as measured from end to end....
and 1/110 of its massMass
In physical science, mass refers to the degree of acceleration a body acquires when subject to a force: bodies with greater mass are accelerated less by the same force....
. Thus, the average cat's brain accounts for 0.9 percent of its total body mass, compared to 2 percent of total body mass in the average humanHuman
A human being, also human or man, is a member of a species of bipedalism primates in the family Hominidae . Mitochondrial DNA evidence indicates that modern humans originated in east Africa about 200,000 years ago....
. The surface area of a cat's cerebral cortexCerebral cortex
The cerebral cortex is a structure within the brain that plays a key role in memory, attention, perceptual awareness, thought, language, and consciousness....
is approximately 83 cm². The modern human cerebral cortex is about 2500 cm².(*) Interestingly, cat brains have been shown to be more similar to human brains than other domesticated animals. According to researchers at Tufts University School of Veterinary Medicine, the physical structure of human brains and that of cats are very similar; they have the same lobes in the cerebral cortex (the "seat" of intelligence) as humans do. Human brains also function the same way, conveying data via identical neurotransmitters.
Cats and humans share similiar X and Y chromosomesResearchers, acting as "genetic paleontologists," recently discovered that the X and Y chromosomes of cats and humans are remarkably alike, despite the fact that the two species haven't shared a common ancestor for about 90 million years—around the same time the human line diverged from goats, sheep, and cows.
Cockyness and Anger in Humans and Cats
Felines do not emit as refined signals as apes and of course they can't make gestures, because they have no hands. However, there are some body language characteristics observed in humans which can also be seen in cats . Most notably are the expressions of cockiness and anger.
Humans express self satisfaction, pride or cockiness by walking very erect and throwing their head back and thrusting the chin forward. The equivalent behavior, typical to cats, is the stalking or prancing around, head up and tail in the air.
When humans are shocked or extremely frightened, the hair on their arms and sometimes their neck literally stands on end. The same applies to felines. Adrenaline rush causes the phenomenon. Raised hackles in humans as well as in cats signify fear, imminent aggression or shock. The same applies to dilated pupils. The human eye tends to expand involuntarily in extreme situations just as it does in cats.
Originally posted by chiron613
They'll both sit staring at a place on the wall, as though looking at a bug. But there's no bug. But their eyes track whatever it is, even though it's invisible. Obviously they're trying to creep me out. They succeed very well.