The O.H. 7 (Olduvai Gorge, Tanzania) hominid partial brain endocast revisited

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Abstract
The O.H.7 brain endocast was reexamined using a stereoplotting apparatus to quantify the amount of distortion. Some 127 measurements for each of the left and right sides were taken and treated statistically by student t‐tests, both in paired and grouped fashion. Grouped data indicated no significant left‐right differences. Paired data suggested three small regions of distortion, which produced three pairs of left‐right differences that were significantly different. Given the very local nature of these minor distortions, it is concluded that the original reconstruction by Tobias was essentially correct. In addition, multiple regression analyses of selected chord‐arc dimensions suggest that a volume in excess of 700 ml is most probable.