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发表于 2011-1-22 04:28:58
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本帖最后由 wangxue6677 于 2011-1-22 23:55 编辑
Scientific research, learning, subjects
If similar signals exist in humans, they're very subtle(faint in quality, so difficult to explain) ones. After collecting the tears from several volunteers, Gelstein confirmed that they had no obvious smell. Men could not tell the difference between them and drop of saline that had been trickled(to flow in small amounts) down the cheeks of the same women.
But the drops did provoke a rection. Gelstei asked 24 men to sniff a jar containing either fresh tears or saline, and to wear a pad on their upper lip soaked in the same chemical. Each volunteer smelled tears on one day and saline on another. Neither they nor Gelstein knew which was which until all the results were in. While the smell of tears wafting into their nostrils, the men found pictures of women faces less sexually attractive, although no more or less sad. Saline didn't affect them either way.
In a second experiment, Gelstein asked 50 men to sniff tears or saline before watching a sad film. In this explicitly sad context, the tears did not influence the volunteers' mood any more than saline did. But when the men sniffed tears, their skin became better at conducting an electric current than after sniffing saline. As before, their sexual arousal dipped afterward, according to their answers on a questionnaire. Their saliva even backed up their claims, for it contained less testosterone.
As a final test, Gelstein scanned the volunteers' brains while they took a whiff of tears. She specifically focused on parts of the brain that are involved in sexual arousal. such as the hypothalamus, which controls several basic bodily functions, and the fusiform gyrus, which helps us to recognise faces. She found that these areas were less active when the men watch a sad film, if they had previously sniffed tears instead of saline.
Gelstein focused on emotional tears, because they contain different chemicals to those we shed to lubricate our eyes and remove irritating rubstances. These differences were discovered the University of Tilburg says,"I could not replicate that finding twice much more sophisticated methods."
Even if emotional tears are different to other types, Vingerhodts thinks that Gelstein should have compared sad tears to irritated ones, as well as to saline. "It would be intriguing also to harvest 'positive' tears, associated with feeling such as admiration or elevation," he says. Touhara agrees that "some important controls are missing"; for a start, he wants to see what male tears would do. |
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