Elizabeth A. Stuart

Source: Statist. Sci., Volume 25, Number 1, 1--21.

Abstract:
When estimating causal effects using observational data, it is desirable to replicate a randomized experiment as closely as possible by obtaining treated and control groups with similar covariate distributions. This goal can often be achieved by choosing well-matched samples of the original treated and control groups, thereby reducing bias due to the covariates. Since the 1970s, work on matching methods has examined how to best choose treated and control subjects for comparison. Matching methods are gaining popularity in fields such as economics, epidemiology, medicine and political science. However, until now the literature and related advice has been scattered across disciplines. Researchers who are interested in using matching methods—or developing methods related to matching—do not have a single place to turn to learn about past and current research. This paper provides a structure for thinking about matching methods and guidance on their use, coalescing the existing research (both old and new) and providing a summary of where the literature on matching methods is now and where it should be headed.

We can adapt flexibly to environment changes and search for the most appropriate rule to a context. The orbital prefrontal cortex (PFo) has been associated with decision making, rule generation and maintenance, and more generally has been considered important for behavioral flexibility. To better understand the neural mechanisms underlying the flexible behavior, we studied the ability to generate a switching signal in monkey PFo when a strategy is changed. In the strategy task, we used a visual cue to instruct two male rhesus monkeys either to repeat their most recent choice (i.e., stay strategy) or to change it (i.e., shift strategy). To identify the strategy switching-related signal, we compared nonswitch and switch trials, which cued the same or a different strategy from the previous trial, respectively. We found that the switching-related signal emerged during the cue presentation and it was combined with the strategy signal in a subpopulation of cells. Moreover, the error analysis showed that the activity of the switch-related cells reflected whether the monkeys erroneously switched or not the strategy, rather than what was required for that trial. The function of the switching signal could be to prompt the use of different strategies when older strategies are no longer appropriate, conferring the ability to adapt flexibly to environmental changes. In our task, the switching signal might contribute to the implementation of the strategy cued, overcoming potential interference effects from the strategy previously cued. Our results support the idea that ascribes to PFo an important role for behavioral flexibility.

SIGNIFICANCE STATEMENT We can flexibly adapt our behavior to a changing environment. One of the prefrontal areas traditionally associated with the ability to adapt to new contingencies is the orbital prefrontal cortex (PFo). We analyzed the switching related activity using a strategy task in which two rhesus monkeys were instructed by a visual cue either to repeat or change their most recent choice, respectively using a stay or a shift strategy. We found that PFo neurons were modulated by the strategy switching signal, pointing to the importance of PFo in behavioral flexibility by generating control over the switching of strategies.

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Washington D.C., Apr 24, 2020 / 02:00 pm (CNA).- The Chinese Communist Party (CCP) covered up the spread of the new coronavirus within the country, suppressing the real rate of infection and violating the rights of its citizens as it did so, a Chinese human rights activist told a forum at The Catholic University of America on Friday.

“It is time to recognize the threat the Chinese Communist Party poses to all humanity. The CCP represses and manipulates information to strengthen its hold on power, regardless of the toll on human lives,” human rights lawyer Chen Guangcheng said April 24 during an online forum on the CCP and the new coronavirus.

The forum was hosted by Faith & Law in partnership with the Institute for Human Ecology at the Catholic University of America. Guanchen is Distinguished Visiting Fellow at Catholic University’s Institute for Policy Research and Catholic Studies.

Guangcheng is a blind human rights lawyer from China, who received sanctuary in the U.S. in 2012 after he was targeted by the CCP for his advocacy work. Guangcheng has sharply criticized the party for its human rights abuses, including from its one-child family planning policy.

He was sent to prison and subject to house arrest, during which he claims he and his family were repeatedly beaten and denied medical treatment.

On Friday, the lawyer warned audience members against suggestions that other countries should emulate China’s authoritarian response to the new coronavirus (COVID-19).

There are currently more than 2.7 million confirmed cases of COVID-19 in the world.

The city of Wuhan is recognized as the epicenter of the global pandemic, and the government on Jan. 23 instituted a strict lockdown in the city of 11 million people. Guangchang cited reports of Chinese families being barricaded inside their own homes, and the group Human Rights Watch compiled stories of residents reportedly dying from lack of access to care during the lockdown.

“Whole families have been found dead in their apartments because they could not get out,” he said, noting that despite the CCP’s claim that it has the virus under control, lockdowns are currently in force in the city of Harbin.

“This is despite the authorities ordering everyone back to work and telling the outside world that they have the virus under control,” Guangcheng said. “The resurgence is directly related to the CCP hiding the truth, and cracking down on people who tried to share information on the virus.”

He also claimed that the CCP has been using the crisis caused by the pandemic to crack down on dissent, detaining human rights activists at separate “so-called quarantine sites.”

The wife of one human rights lawyer—who had just been released from prison told The Guardian that she feared the government was putting her husband under house arrest near where he was imprisoned, 400 kilometers away from her, under the guise of a quarantine.

According to World Health Organization (WHO) statistics, China’s number of COVID-19 cases rose considerably through January and February to 79,389 on Feb. 29 with 2,838 deaths, before its daily increase in case numbers slowed to a trickle in March including just one new reported case on March 22 in the country of more than 1.4 billion people.

Just 3,352 deaths were reported on April 16 before the reported number jumped to 4,642 the next day.

“There is nothing about the CCP’s numbers that are believable,” Guangcheng said. “What people are calculating is that roughly 700,000 may have died in China—in terms of people who have been infected, no one knows the numbers.”

For instance, he said, during the Wuhan lockdown citizen journalists claimed that the situation was far worse than the CCP was reporting; they recorded people collapsing in the streets and hearses and vans carrying body bags at all hours of the day.

“In summary, the CCP is the biggest and most serious virus of all, with over 193,000 people dead worldwide from the coronavirus,” the lawyer said. “There should be no question of the regime’s threat.”

Denver Newsroom, Apr 24, 2020 / 03:32 pm (CNA).- A Catholic lawyer says his arrest last Saturday is part of mainland China’s wide-ranging efforts to tighten control over Hong Kong.

His ordeal follows his participation in months of pro-democracy protests on the island, which have been slowed by the coronavirus pandemic.

Hong Kong police arrested 81-year-old Martin Lee, along with 14 other pro-democracy protestors, on April 18. Lee has been demonstrating for universal suffrage in Hong Kong for nearly 40 years, and this is his first arrest, the Washington Post reports.

CNA spoke with one of Lee’s close friends, who said Lee and those arrested with him are currently bailed out of prison, and are safe.

Lee, the founder of Hong Kong’s Democratic Party, wrote in an April 21 column in the Washington Post that he was arrested for taking part in protests last year against an extradition bill— now withdrawn— which would have allowed the Chinese government to extradite alleged criminals from Hong Kong to the mainland to stand trial.

Hong Kong is currently facing two plagues from China, Lee wrote: the coronavirus (COVID-19) and “attacks on our most basic human rights.”

“We can all hope a vaccine is soon developed for the coronavirus. But once Hong Kong’s human rights and rule of law are rolled back, the fatal virus of authoritarian rule will be here to stay,” Lee wrote.

He said that the free press in Hong Kong was vital for alerting the world to the dangers of the coronavirus, even as Chinese state media sought to repress information about the outbreak.

Now, Chinese authorities are attempting to pass legislation to increase their influence over Hong Kong, Lee said.

Hong Kong is a special administrative region of China. Hong Kongers enjoy freedom of worship and evangelization, while in mainland China, there is a long history of persecution for Christians who run afoul of the government.

In January, China appointed Luo Huining as the head of the powerful Central Liaison Office in Hong Kong. Luo last week intensified calls for Communist China to exercise more control in Hong Kong by passing “national security legislation.”

The legislation would outlaw “sedition, subversion and the theft of state secrets,” Lee wrote.

This is not the first time the legislation has been introduced— in 2003, widespread protests against the measure led China to withdraw it.

The passing of such a “subversion” law would give China even more power to quash Hong Kongers’ freedoms, Lee warned.

“These vague standards are designed to protect the Chinese Communist Party and undermine core freedoms of Hong Kong, such as freedoms of religion, assembly and the press — including the reporting of pandemics that embarrass Beijing,” he wrote.

The Justice and Peace Commission of the Diocese of Hong Kong released a statement condemning the arrests April 18, calling for an end to all arrests until an independent commission can be established, and for the police to return the mobile phones of all arrested persons in order to ensure their privacy.

The diocese also reiterated that the government must respond to the demands for which the pro-democracy demonstrators have been calling for months, which include an independent inquiry into police tactics.

A Hong Kong friend of Lee, who declined to be identified for safety, said they believe Sun Li Jun— the deputy public security minister for Hong Kong who oversees the Chinese secret police— wanted to send a message of power ahead of Chinese Workers’ Day celebration on May 1.

The friend believes Sun— who is reportedly under investigation by China for corruption— ordered the arrests to show that the authorities have control of the pro-democracy movement in Hong Kong.

“As the followers of God, we will keep praying for [Hong Kong] and let our Lord lead the way,” Lee’s friend told CNA.

“In HK we all love China and Chinese people but we are against CCP [Chinese Communist Party] for what they did to all of us now and before.”

An estimated 1 million protesters turned out at the first major pro-democracy demonstration in Hong Kong on June 6, 2019.

Catholics have played a major role in the protests, which continued after the extradition bill was revoked. Protestors largely called for the resignation of chief executive Carrie Lam— herself a Catholic— more open elections in the region, and an investigation into police brutality allegations.

In October, the legislature of Hong Kong completed the process of officially withdrawing the controversial extradition bill.

“Had the extradition bill been passed, we could have faced trial already in China instead of Hong Kong,” Lee noted in his column.

The impetus for the bill was a case involving a young Hong Kong man whom Taiwan requested be extradited for an alleged murder. Hong Kong previously has no formal extradition agreements with mainland China or Taiwan.

Christians and advocates widely opposed the bill, fearing that the Chinese government, which already seeks to control and suppress Christianity on the mainland, would use it to further tighten its grip on free exercise of religion in Hong Kong.

 

CNA Staff, Apr 30, 2020 / 02:00 pm (CNA).- As the Chinese government makes progress containing the COVID-19 pandemic, authorities have resumed action to remove crosses from buildings and crackdown on religious practice.

The latest round of enforcement actions have included the removal of crosses from buildings belonging to the state-run churches. According to a report from UCA News, priests say they are cooperating in the removal of exterior crosses in hopes that entire church buildings will not be demolished or converted into a building for secular use.  

According to a parishioner in the Chinese province of Anhui named John, Chinese officials cut down the cross from the top of Our Lady of the Rosary Church on April 18. Our Lady of the Rosary belongs to the Chinese Patriotic Catholic Association (CPCA, the Catholic Church officially sanctioned by the Chinese Communist Party and operating both in communion with Rome and under state control. 

The bishops of the CPCA, who were in many cases illicitly consecrated and under official excommunication, were received into full communion with Rome as part of the Vatican’s 2018 provisional agreement with China. The full terms of the China deal were not released to the public but have been reported to include the right of state authorities to propose and veto candidates for the episcopacy in China. 

John, speaking to UCA News, explained that on April 13, the leaders of Our Lady of the Rosary--which does not have a member of the clergy assigned to it, and all religious activities are organized by the laity--asked the city authorities about making repairs to the church building. Three days later, the community director of the city requested keys and access to the church, in order to remove its cross. 

Concerned parishioners went to Bishop Joseph Liux Xinhong of the Diocese of Anhui, who told them to request more information from the local CPCA office. The local CPCA office said they did not know of any plan to remove the cross from the building. 

Xinhong was one of the bishops who had his excommunication lifted and his position recognized by the Vatican following the 2018 provisional deal. 

On April 17, the parish community leader said that he had been given “directions from superiors” regarding removing the cross. The following day, said John, the cross was removed by a “team of young people.”

Elsewhere in the province of Anhui, on April 19 a cross was removed from a church in Suzhou City during pre-dawn hours, presumably to avoid the chance of a crowd protesting its removal. A man from the diocese named Paul told UCA News that the removal had previously been scheduled for the afternoon. 

Paul said that police officers blocked people from entering the church or taking pictures of the removal, and that a cell phone had been confiscated after it captured a picture of the cross coming down. 

In Hefei City, which is also located in the Anhui province, authorities on April 27 took a cross off a building for a Protestant church. 

A priest from the Diocese of Anhui, identified only as “Father Chen,” told UCA News that these sorts of activities are “happening all over the mainland” and are not limited to one diocese or province. 

 “If the churches don’t unite to resist, many more crosses will be removed,” he said.

In September 2017, China enacted strict new regulations concerning religion. Since then, authorities have been vigilant in enforcing permitting requirements. Churches that are not found to be in compliance are destroyed. 

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