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Discussion and Debate
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Physical & Life Sciences
Creation & Evolution
If evolution is true
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<blockquote data-quote="Gene2memE" data-source="post: 76295719" data-attributes="member: 341130"><p>The Stoned Ape hypothesis falls apart under even cursory examination. At least as a single cause explanation for the expansion of 'human' brain size/capacity.</p><p></p><p>The fulcrum of its fall is the claims from proponents that the size of the human brain suddenly doubled or tripled at some point in the past.</p><p></p><p>D. McKenna: "We know the <strong>brain tripled in size about 2 million years ago</strong>."</p><p>T. McKenna: "The action of hallucinogens present in many common plants enhanced our information processing activity, or environmental sensitivity, and thus <strong>contributed to the sudden expansion of the human brain size</strong>."</p><p>Paul Stamets: “What is really important for you to understand is that there was a<strong> sudden doubling of the human brain 200,000 years ago</strong>. From an evolutionary point of view, that’s an extraordinary expansion. And there is no explanation for this sudden increase in the human brain.”</p><p></p><p>The size of hominid brains did indeed increase. But it was only "sudden" in a geographic sense. Hominid brain capacity grew from about 450-600cc to about 1200-1600cc over the course of 3 to 3.5 million years.</p><p></p><p>There are some 'leaps', but they're inter-species and generally small (roughly 150-250cc) and they're not as important or substantial as the incremental brain size growth seen within species. For instance, with Paranthropus the average capacity of the brain case grew by roughly 50% over the course of 1 million years. Homo erectus brain capacity also grew, by roughly 75%, over the course of about 800,000 years, ending up at nearly 1100cc.</p><p></p><p>There are a range of factors that likely contributed to brain development (bipedalism, control of fire, shifting dietary patterns, development of speech, development of tools, development of cooperative tribal groups, expansion into new geographic areas), rather than a silver bullet 'magic mushrooms did it, man' explanation.</p><p></p><p>They may have contributed, but only as a small part of one section of the whole.</p></blockquote><p></p>
[QUOTE="Gene2memE, post: 76295719, member: 341130"] The Stoned Ape hypothesis falls apart under even cursory examination. At least as a single cause explanation for the expansion of 'human' brain size/capacity. The fulcrum of its fall is the claims from proponents that the size of the human brain suddenly doubled or tripled at some point in the past. D. McKenna: "We know the [B]brain tripled in size about 2 million years ago[/B]." T. McKenna: "The action of hallucinogens present in many common plants enhanced our information processing activity, or environmental sensitivity, and thus [B]contributed to the sudden expansion of the human brain size[/B]." Paul Stamets: “What is really important for you to understand is that there was a[B] sudden doubling of the human brain 200,000 years ago[/B]. From an evolutionary point of view, that’s an extraordinary expansion. And there is no explanation for this sudden increase in the human brain.” The size of hominid brains did indeed increase. But it was only "sudden" in a geographic sense. Hominid brain capacity grew from about 450-600cc to about 1200-1600cc over the course of 3 to 3.5 million years. There are some 'leaps', but they're inter-species and generally small (roughly 150-250cc) and they're not as important or substantial as the incremental brain size growth seen within species. For instance, with Paranthropus the average capacity of the brain case grew by roughly 50% over the course of 1 million years. Homo erectus brain capacity also grew, by roughly 75%, over the course of about 800,000 years, ending up at nearly 1100cc. There are a range of factors that likely contributed to brain development (bipedalism, control of fire, shifting dietary patterns, development of speech, development of tools, development of cooperative tribal groups, expansion into new geographic areas), rather than a silver bullet 'magic mushrooms did it, man' explanation. They may have contributed, but only as a small part of one section of the whole. [/QUOTE]
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