NEUR2600 Lecture 3 PDF

Title	NEUR2600 Lecture 3
Course	Brain and Behaviour
Institution	University of Lethbridge
Pages	1
File Size	39.4 KB
File Type	PDF
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NEUR 2600 Spring 2017 Lecture 3 notes...

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C1L3 - The human brain Monday, January 16, 2017 1:00 PM

A sequence of human evolution Australopithecus

6 million years ago

Homo habilis

2 million years ago

Homo erectus

1 million years ago

Homo sapiens

100 thousand years ago

Two types of homo origins 1. Savanna hypothesis 2. Water baby hypothesis

Brain Size  Brain size has increased steadily in the human lineage, but the biggest increase occurred with the appearance of first humans, homo habilis. To explain the increases one needs to explain both the big jump and the slower increases  There are lots of explanations for why brain size increased and they are probably all correct - it just is not clear when each of these factors made its contribution

Everyone has a hypothesis of brain size increase 1. Blood flow - radiator hypothesis 2. Tools - best tool maker, biggest brain? 3. Love - round head = bigger volume = bigger brain 4. Neoteny - baby having babies 5. Temperature- cold region = round body, bigger brain 6. Food Is human brain related to brain size?...