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In the research reported Thursday, Dr. Tonegawa’s team first put mice in one environment and let them get used to it and remember it. They identified and chemically labeled the cells in the animals’ brains where that memory was being formed. The mice were not shocked in that environment.
A day later, in a completely different environment, the researchers delivered an electric shock to the mice at the same time that they stimulated the previously identified brain cells to trigger the earlier memory.
New York City’s “stop-and-frisk” policy has been the subject of major debates and several lawsuits in recent months. A new paper (gated) by Stephanie A. Wiley and Finn-Aage Esbensen analyzes the relationship between “police contact” and future attitudes and actual criminal acts among children and teens:
Current police policies are based on assumptions that proactive policing strategies will not only deter crime but will also improve police–community relations. Deterrence theorists argue that general and specific deterrence can be achieved through such policing strategies. Labeling proponents, however, maintain that juveniles stopped and/or arrested by the police, rather than be deterred, will actually engage in more delinquency as a result of this contact. Research to date has provided mixed evidence. The current study seeks to inform this debate by examining the effect of being stopped or arrested on subsequent delinquent behavior and attitudes. Relying on three waves of data from a multisite sample of youth, we use propensity score matching to control for preexisting differences among youth who have and have not experienced police contact. Our findings reveal that being stopped or arrested not only increases future delinquency but also amplifies deviant attitudes.
The BPS Research Digest elaborates:
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The key finding is that with participants matched for propensity, those who had contact with the police at time two (compared with those who didn’t) said at time three that they’d feel less guilt if they committed various offences from theft to violence; they expressed more agreement with various “neutralisation” scenarios (e.g. it’s OK to lie to keep yourself out of trouble); they were more committed to their deviant peers (e.g. they planned to continue hanging out with friends who’d been arrested); and finally, they said they’d engaged in more offending behaviour, from skipping classes to taking drugs or being violent. This pattern of results differed little whether police contact involved being arrested or merely being stopped.
We’ve blogged before about the potential of 3D food printers, but at the moment such printers seem out of reach for the average consumer. Perhaps not for long — a new paper by B.T. Wittbrodt, A.G. Glover, J. Laureto, G.C. Anzalone, D. Oppliger, J.L. Irwin, and J.M. Pearce conducts a cost-benefit analysis of 3D printers for the average household:
This study reports on the life-cycle economic analysis (LCEA) of RepRap technology for an average U.S. household. A new low-cost RepRap is described and the costs of materials and time to construct it are quantified. The economic costs of a selection of twenty open-source printable designs (representing less than 0.04% of those available), are typical of products that a household might purchase, are quantified for print time, energy, and filament consumption and compared to low and high Internet market prices for similar products without shipping costs. The results show that even making the extremely conservative assumption that the household would only use the printer to make the selected twenty products a year the avoided purchase cost savings would range from about $300 to $2,000/year. Assuming the 25 hours of necessary printing for the selected products is evenly distributed throughout the year these savings provide a simple payback time for the RepRap in 4 months to 2 years and provide an ROI between>200% and >40%. As both upgrades and the components that are most likely to wear out in the RepRap can be printed and thus the lifetime of the distributing manufacturing can be substantially increased the unavoidable conclusion from this study is that the RepRap is an economically attractive investment for the average U.S. household already. It appears clear that as RepRaps improve in reliability, continue to decline in cost and both the number and assumed utility of open-source designs continues growing exponentially, open-source 3-D printers will become a mass-market mechatronic device.
(HT: Marginal Revolution)
Our recent podcast about tipping mentioned a San Diego restaurant, the Linkery, that adopted a strict no-tipping policy. The Linkery has since closed its doors, but owner Jay Porter (who was featured in the podcast) has been writing about the effects of a no-tipping policy. Here’s Part 1 and Part 2 of his blog posts. A summary of his takeaways:
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1) Due to poorly cohering laws in many Western U.S. states, using a service charge has typically been the only legal way for a restaurant business to balance wages between servers, bartenders, cooks and dishwashers. That’s why restaurants like Chez Panisse instituted such a [service charge] policy.. Subsequent court decisions in the Western U.S. have opened up the possibility that other arrangements are legal, but the service charge is still the safest model.
2) Because tips cannot legally, in most cases, be controlled by the employer, they are typically distributed (or not distributed, as the case may be) according to a social compact between the employees. That social compact is either unenforced or enforced through social means, like ostracization. In either event, the systems for both acquiring and distributing tips are easily gamed by members of the compact who are intent on doing so.
This is a transcript of the Freakonomics Radio podcast “Do Baby Girls Cause Divorce.” [MUSIC: The Jaguars, “By By Mai Thai” (from The Jaguars)] Enrico MORETTI: I’m Enrico Moretti and I’m a professor of economics at Berkeley. Stephen J. DUBNER: Okay, very good. So Enrico, a listener wrote to us with a very, very straightforward […] Read More »
1. They said it would never happen: Israel’s ultra-orthodox lose many of their exemptions.
2. Health-care economics: how the American Medical Association prices medical procedures.
3. The most popular page on Wikipedia in 2012: Facebook. (HT: Eric M. Jones)
4. Everyone knows that the French work fewer hours — but judging by their GDP per capita, they are very productive. Read More »
Quartz reports that a Japanese P.R. company is paying women to wear advertising stickers on their thighs:
Advertising on women’s skin appears to be much more cost-effective than forking out exorbitant sums for public billboard space. In 2012, the overall expenditure on ‘outdoor’ advertising in Japan was ¥299.5 billion ($2.99 billion) (pdf). The going rate on each thigh, according to the company, is $121 per day. The 3,000 Japanese women who signed up to participate will slap stickers on their thighs in exchange for that sum. The campaigns, which began rolling out earlier this year, so far have included plugs for the movie Ted and the band Green Day.
The agency has a few requirements for its walking billboards: they must be over 18, have at least 20 friends on social networking sites, and must post pictures of themselves wearing the sticker in two different geographic locations. The agency also “recommends” that the women wear miniskirts and long socks to draw attention to the ads. “It’s an absolutely perfect place to put an advertisement, as this is what guys are eager to look at and girls are eager to expose,” Hidenori Atsumi, the agency’s CEO, told ITN.
(HT: Marginal Revolution)