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Encephalization quotient of apes and primates but definitely not bigger than that of humans.Methods My partners and I measured the skulls of Australopithecus, Homo habilis, Homo erectus, and Neanderthals species by measure of the heights, widths, and length of their skulls. The methods we used to measure these skulls were measuring tape and calipers by adjusting the calipers to a tight, precise measurement of the skull’s width, length, and height. We could not include the fins of some of these skulls when measuring the width; as these will make the measurements as well as the EQ inaccurate. After we got the precise measurement of one of them at a time, we then used the measuring tape to measure the distance between the calipers’ ends. Next, we recorded our measurements in millimeters on the data sheet. As for the description of each specimen’s skulls, the skull of the Homo habilis was indeed the smallest compared to the skulls of other fossil hominins. Its measurements were 90 mm in height, 135 mm in length and 115 mm in height. As for Australopithecus, its skull was the second smallest but not much bigger than that of Homo habilis.Its skull also had fins so we could not include them in the measurements. Its measurements were 95 mm in height, 150 mm in length and 99
mm in width. Homo erectuswas the second largest due to its measurements: 105 mm in height, 145 mm in length, and 120 mm in width. However, the skull of Neanderthals is by far the largest with measurements of 134 mm in height, 190 mm in length, and 144 mm in width. We also measured the orbit height of each skull by using calipers to measure the diameter of the eye socket. After we collected all the data from the skulls, we used them to calculate the body mass and “observed” brain size. To calculate the body mass, we used this formula: 10^(2.53 x log(Orbit Height) – 2.29= Body Mass, and to calculate the cranial capacity (brain size), we used this formula: (0.0003425 x Length x Width x Height) + 95 = Cranial Capacity. These variables