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J Scott Hill

Food For Thought: Meat-Based Diet Made Us Smarter : NPR - 0 views

www.npr.org/...eat-based-diet-made-us-smarter

evolution human thought food diet

shared by J Scott Hill on 29 Jan 13 - No Cached
  • Our earliest ancestors ate their food raw — fruit, leaves, maybe some nuts. When they ventured down onto land, they added things like underground tubers, roots and berries.
  • "You can't have a large brain and big guts at the same time," explains Leslie Aiello, an anthropologist and director of the Wenner-Gren Foundation in New York City, which funds research on evolution. Digestion, she says, was the energy-hog of our primate ancestor's body. The brain was the poor stepsister who got the leftovers.
  • "What we think is that this dietary change around 2.3 million years ago was one of the major significant factors in the evolution of our own species," Aiello says.
  • ...7 more annotations...
  • cut marks on animal bones appeared
  • that could have been made only by a sharp tool.
  • But Aiello's favorite clue is somewhat ickier — it's a tapeworm. "The closest relative of human tapeworms are tapeworms that affect African hyenas and wild dogs," she says.
  • Besides better taste, cooked food had other benefits — cooking killed some pathogens on food.
  • It breaks up the long protein chains, and that makes them easier for stomach enzymes to digest. "
  • collagen is very hard to digest. But if you heat it, it turns to jelly."
  • starchy foods like turnips, cooking gelatinizes the tough starch granules and makes them easier to digest too. Even just softening food — which cooking does — makes it more digestible. In the end, you get more energy out of the food.
  • J Scott Hill on 29 Jan 13
     
    Interesting audio piece on cooked food, meat, and the evolution of our big brains.
Brendan Raleigh

Support for Linguistic Relativity - 1 views

www1.icsi.berkeley.edu/...cats-dogs-in-press.pdf

linguistic relativism sapir whorf hypothesis cognition thinking brain thought process

shared by Brendan Raleigh on 20 Feb 13 - No Cached
  • Brendan Raleigh on 20 Feb 13
     
    Gilbert, Regier, Kay, and Ivry use several studies done regarding the left and right hemisphere of the brain and how each hempishere is able to react to certain stimuli, especially color and animals, given the types of classification each language puts the items in. Due to the effect classification had on reaction times, the data supports the idea that language affects cognition and understanding of the word. "in an early study, Kay and Kempton (1984) found that English speakers perceive colors that cross the lexical boundary between ''green'' and ''blue'' to be less similar than do Tarahumara speakers of Mexico, who use the same word to identify both of these colors, and thus lack a lexical boundary at this position in color space" "Reaction times (RTs) were faster when the target belonged to a different lexical category than the distractors (e.g., blue among greens) compared to when the target and distractors were from the same lexical category (e.g., two different hues of green). However, this effect was only observed when the target appeared in the right visual field; RTs to targets in the left visual field did not vary as a function of the categorical relationship between the target and distractors." "RTs to targets in the left visual field did not vary as a function of the categorical relationship between the target and distractors" "The results of Experiment 2 are consistent with the hypothesis that language modulates perceptual discrimination by means of lexical categories more in the RVF than in the LVF. This pattern is disrupted by verbal, but not by nonverbal, interference, supporting the third prediction outlined in the introduction." "the disruption of Whorf effects by verbal interference strongly suggests that language affects discrimination on-line through the activation of lexical codes, rather than through a long-term, enduring warping of perceptual space."
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