Some animals can reflect upon, monitor, regulate their states of mind

Washington, September 15 (ANI): Conducting extensive research into animal cognition, psychologists at the University at Buffalo have found that some animals may share humans’ ability to reflect upon, monitor or regulate their states of mind.

“Comparative psychologists have studied the question of whether or not non-human animals have knowledge of their own cognitive states by testing a dolphin, pigeons, rats, monkeys and apes using perception, memory and food-concealment paradigms,” said Dr. J. David Smith, a comparative psychologist at the university.

“The field offers growing evidence that some animals have functional parallels to humans’ consciousness and to humans’ cognitive self-awareness,” he added.

He counts dolphins and macaque monkeys among such species.

Recounting the original animal-metacognition experiment with Natua the dolphin, Smith said: “When uncertain, the dolphin clearly hesitated and wavered between his two possible responses, but when certain, he swam toward his chosen response so fast that his bow wave would soak the researchers’ electronic switches.”

He added: “In sharp contrast, pigeons in several studies have so far not expressed any capacity for metacognition. In addition, several converging studies now show that capuchin monkeys barely express a capacity for metacognition. This last result,” Smith says, “raises important questions about the emergence of reflective or extended mind in the primate order. This research area opens a new window on reflective mind in animals, illuminating its phylogenetic emergence and allowing researchers to trace the antecedents of human consciousness.”

Smith describes metacognition as a sophisticated human capacity linked to hierarchical structure in the mind because the metacognitive executive control processes oversee lower-level cognition, to self-awareness because uncertainty and doubt feel so personal and subjective, and to declarative consciousness because humans are conscious of their states of knowing and can declare them to others.

Therefore, Smith says: “It is a crucial goal of comparative psychology to establish firmly whether animals share humans’ metacognitive capacity. If they do, it could bear on their consciousness and self-awareness, too.”

He concludes, “Metacognition rivals language and tool use in its potential to establish important continuities or discontinuities between human and animal minds.”

A research article describing his study has been published in the journal Trends in Cognitive Science. (ANI)

Why sleep deprivation affects some people more than others

Washington, June 25 (ANI): Conducting a new imaging research, scientists have explained why sleep deprivation affects some people more than others.

Researchers observed that people who are genetically vulnerable to sleep loss showed reduced brain activity after staying awake all night, while those who are genetically resilient showed expanded brain activity.

The findings help explain individual differences in the ability to compensate for lack of sleep.

“The extent to which individuals are affected by sleep deprivation varies, with some crashing out and others holding up well after a night without sleep,” said Dr. Michael Chee, at the Duke-National University of Singapore Graduate Medical School.

In the current study, the researchers, led by Dr. Pierre Maquet, at the University of Liege in Belgium selected study participants based on their genes.

Previous research showed that the PERIOD3 (PER3) gene predicts how people will respond to sleep deprivation. People carry either long or short variants of the gene.

Those with the short PER3 variant are resilient to sleep loss – they perform well on cognitive tasks after sleep deprivation.

However, those with the long PER3 variant are vulnerable – they show deficits in cognitive performance after sleep deprivation. Now the new study explains why.

The authors imaged study participants while they did a working memory task that requires attention and cognitive control – also called executive function.

They found that the resilient, short gene variant group compensated for sleep loss by “recruiting” extra brain structures.

Besides brain structures normally activated by the cognitive task, these participants showed increased activity in other frontal, temporal, and subcortical brain structures after a sleepless night.

On the other hand, after a sleepless night, vulnerable participants, the long PER3 group, showed reduced activity in brain structures normally activated by the task.

These participants also showed reduced brain activity in one brain structure – the right posterior inferior frontal gyrus – after a normal waking day.

The above data is consistent with previous research suggesting that people with the long gene variant perform better on executive tasks earlier, but not later, in the day.

“Our study uncovers some of the networks underlying individual differences in sleep loss vulnerability and shows for the first time how genetic differences in brain activity associate with cognitive performance and fatigue. The data also provide a basis for the development of measures to counteract individual cognitive deficits associated with sleep loss,” said study author Maquet.

The study is published in the latest issue of The Journal of Neuroscience. (ANI)

Faster, more energy efficient electronics comes closer to reality

Washington, June 21 (ANI): You may see smaller, faster, more powerful, and less energy consuming electronic devices emerge in future, thanks to a new discovery by researchers at the Department of Energy’s Oak Ridge National Laboratory.

Describing their work in the journal Science, the researchers have revealed that it involves a method to measure intrinsic conducting properties of ferroelectric materials, which for decades have held tremendous promise but have eluded experimental proof.

They believe that with this work, they may be on a path that will see barriers tumble.

“For years, the challenge has been to develop a nanoscale material that can act as a switch to store binary information. We are excited by our discovery and the prospect of finally being able to exploit the long-conjectured bi-stable electrical conductivity of ferroelectric materials,” said ORNL Wigner Fellow Peter Maksymovych.

“Harnessing this functionality will ultimately enable smart and ultra-dense memory technology,” added the expert who has jointly authored this study report with Stephen Jesse, Art Baddorf and Sergei Kalinin at the Center for Nanophase Materials Sciences.

The researchers claim that this is the first time that any group of researchers have demonstrated a giant intrinsic electroresistance in conventional ferroelectric films, where flipping of the spontaneous polarization increased conductance by up to 50,000 percent.

Ferroelectric materials can retain their electrostatic polarization and are used for piezoactuators, memory devices and RFID (radio-frequency identification) cards.

“It is as if we open a tiny door in the polar surface for electrons to enter. The size of this door is less than one-millionth of an inch, and it is very likely taking only one-billionth of a second to open,” Maksymovych said.

As authors write, the key distinction of ferroelectric memory switches is that they can be tuned through thermodynamic properties of ferroelectrics.

“Among other benefits, we can use the tunability to minimize the power needed for recording and reading information and read-write voltages, a key requirement for any viable memory technology,” Kalinin said.

Maksymovych pointed out that numerous previous works have demonstrated defect-mediated memory, but defects cannot easily be predicted, controlled, analyzed or reduced in size.

Ferroelectric switching, however, surpasses all of these limitations and will offer unprecedented functionality.

The authors believe that using phase transitions such as ferroelectric switching to implement memory and computing is the real fundamental distinction of future information technologies. (ANI)

Faster, more energy efficient electronics comes closer to reality

Washington, June 21 (ANI): You may see smaller, faster, more powerful, and less energy consuming electronic devices emerge in future, thanks to a new discovery by researchers at the Department of Energy’s Oak Ridge National Laboratory.

Describing their work in the journal Science, the researchers have revealed that it involves a method to measure intrinsic conducting properties of ferroelectric materials, which for decades have held tremendous promise but have eluded experimental proof.

They believe that with this work, they may be on a path that will see barriers tumble.

“For years, the challenge has been to develop a nanoscale material that can act as a switch to store binary information. We are excited by our discovery and the prospect of finally being able to exploit the long-conjectured bi-stable electrical conductivity of ferroelectric materials,” said ORNL Wigner Fellow Peter Maksymovych.

“Harnessing this functionality will ultimately enable smart and ultra-dense memory technology,” added the expert who has jointly authored this study report with Stephen Jesse, Art Baddorf and Sergei Kalinin at the Center for Nanophase Materials Sciences.

The researchers claim that this is the first time that any group of researchers have demonstrated a giant intrinsic electroresistance in conventional ferroelectric films, where flipping of the spontaneous polarization increased conductance by up to 50,000 percent.

Ferroelectric materials can retain their electrostatic polarization and are used for piezoactuators, memory devices and RFID (radio-frequency identification) cards.

“It is as if we open a tiny door in the polar surface for electrons to enter. The size of this door is less than one-millionth of an inch, and it is very likely taking only one-billionth of a second to open,” Maksymovych said.

As authors write, the key distinction of ferroelectric memory switches is that they can be tuned through thermodynamic properties of ferroelectrics.

“Among other benefits, we can use the tunability to minimize the power needed for recording and reading information and read-write voltages, a key requirement for any viable memory technology,” Kalinin said.

Maksymovych pointed out that numerous previous works have demonstrated defect-mediated memory, but defects cannot easily be predicted, controlled, analyzed or reduced in size.

Ferroelectric switching, however, surpasses all of these limitations and will offer unprecedented functionality.

The authors believe that using phase transitions such as ferroelectric switching to implement memory and computing is the real fundamental distinction of future information technologies. (ANI)

Treating juvenile offenders’ physical and mental health needs critical to rehabilitation

Washington, June 20 (ANI): Conducting a comprehensive review of past studies into the health of young offenders undertaken in the US, UK, Europe and Australia since 1997, researchers at the University of Adelaide have come to the conclusion that the physical and mental health needs of juvenile offenders should be treated as a priority, if offenders held in detention have any real hope of rehabilitation.

“Health – both mental and physical health – is an issue that has a serious impact on young offenders,” says lead study author Dr. Anne Wilson, Senior Lecturer in the Discipline of Nursing.

“The health of young offenders is commonly poorer in comparison with the general youth population. Previous studies document the growing concern for the health of young offenders, including their risk-related behaviours, mental health, social and family problems, and other physical health deficits.

“The underlying problems affecting these young offenders need to be addressed as a priority if they are to be successfully rehabilitated and reintegrated into the community,” she adds.

Phillip Tully, a PhD student in the School of Psychology who co-authored the study, says that the review identifies various factors for successful mental health and trauma care-such as improving existing mental health services; identifying mental health problems with a high-quality screening process; ongoing support within and outside of secure care; improving the availability of services; and linking offenders directly to primary health or mental health services on release.

The researchers believe that improving young offenders’ access to health care could go some way to addressing their poor physical health status.

“However, additional social factors, such as education, peer support and family support, are likely to determine whether young offenders access the services they need,” says Dr. Wilson.

“There is little doubt that those released from secure care face immense challenges to maintaining their health and well-being.

“Many young offenders live in social conditions that are not conducive to achieving a healthy state. They are commonly exposed to poverty, social disadvantage, abuse and family dysfunction, and these factors may promote high-risk behaviors such as substance abuse, coping problems, truancy and low educational attainment.

“These social, familial, personal and peer-group factors can lead to repeat offender behaviour and to a generational cycle of health problems. This is most clearly seen in neighbourhoods where drugs are readily available to young people, where they are exposed to adult substance abuse, live in single-parent households, have caregivers with low levels of education, and receive government aid,” she adds.

According to her, effective planning is needed to address ongoing health issues experienced by young offenders when they are released from detention.

“Young offenders have diverse and complex needs. By utilizing a comprehensive screening measure, individual plans can be formulated upon the offender’s admission to secure care, with a view to looking ahead to their eventual discharge and their return to society.”

The study has been reported in the Australian Journal of Primary Health. (ANI)

Scientists reveal secrets of graphene’s extraordinary properties

Washington, May 15 (ANI): In a new analysis, scientists have directly measured the unusual energy spectrum of graphene, which adds new detail to help explain the extraordinary properties of the material.

The analysis was done by researchers from the Georgia Institute of Technology and the National Institute of Standards and Technology (NIST).

Graphene’s exotic behaviors present intriguing prospects for future technologies, including high-speed, graphene-based electronics that might replace today’s silicon-based integrated circuits and other devices.

Graphene apparently owes its enhanced mobility to the fact that its electrons and other carriers of electric charges behave as though they do not have mass.

In conventional materials, the speed of electrons is related to their energy, but not in graphene.

Although they do not approach the speed of light, the unbound electrons in graphene behave much like photons, massless particles of light that also move at a speed independent of their energy.

This weird massless behavior is associated with other strangeness.

When ordinary conductors are put in a strong magnetic field, charge carriers such as electrons begin moving in circular orbits that are constrained to discrete, equally spaced energy levels.

In graphene, these levels are known to be unevenly spaced because of the “massless” electrons.

The Georgia Tech/NIST team tracked these massless electrons in action, using a specialized NIST instrument to zoom in on the graphene layer at a billion times magnification, tracking the electronic states while at the same time applying high magnetic fields.

The custom-built, ultra-low-temperature and ultra-high-vacuum scanning tunneling microscope allowed them to sweep an adjustable magnetic field across graphene samples prepared at Georgia Tech, observing and mapping the peculiar non-uniform spacing among discrete energy levels that form when the material is exposed to magnetic fields.

The team developed a high-resolution map of the distribution of energy levels in graphene.

In contrast to metals and other conducting materials, where the distance from one energy peak to the next is uniformly equal, this spacing is uneven in graphene.

The researchers also probed and spatially mapped graphene’s hallmark “zero energy state,” a curious phenomenon where the material has no electrical carriers until a magnetic field is applied.

The measurements also indicated that layers of graphene grown and then heated on a substrate of silicon-carbide behave as individual, isolated, two-dimensional sheets.

On the basis of the results, the researchers suggest that graphene layers are uncoupled from adjacent layers because they stack in different rotational orientations.

This finding may point the way to manufacturing methods for making large, uniform batches of graphene for a new carbon-based electronics. (ANI)

LTTE sea-borne attack foiled, 18 rebels killed: Sri Lanka

Colombo, April 4 (IANS) A major sea-borne attack by the Tamil Tiger rebels has been foiled after the navy confronted a cluster of Liberation Tigers of Tamil Eelam (LTTE) boats, killing 18 rebels onboard off the northeastern coast of Mullaitivu, defence sources said here Saturday.

According to the sources, the pre-dawn sea battle broke out when the navy’s Special Boat Squadron (SBS) engaged a flotilla of 10 LTTE boats, which included three explosives-packed suicide boats, heading towards Alampil and Nayaru areas.

‘During the sea battle two LTTE boats were destroyed and one more was damaged. The navy conducting the search operation in the area have already recovered at least 11 bodies of the LTTE cadres killed in the pre-dawn clash,’ a defence official attached to the Media Centre for National Security told IANS Saturday.

He added that two naval sailors were wounded and three naval boats sustained minor damages in the battle that broke out around 1.30 a.m. and lasted for several hours.

The official said that in a separate incident a couple of hours later in the same area, army troops manning the forward defence along the northeastern coastal belt have sunk two other LTTE boats.

‘The troops have recovered seven bodies after this incident. Intercepted LTTE communications have revealed that the enemy has suffered heavy casualties,’ the defence official said.

There was no immediate reaction from the LTTE that has been fighting to carve out a separate state in the island’s northeastern provinces over the past quarter century.

Sri Lanka, confident of completely defeating the LTTE militarily, claimed last week that its troops have cornered LTTE into a mere 21-sq km stretch of land, of which 20 sq km are no-fire-zone declared for thousands of civilians trapped in the area.

According to official statistics, the number of civilians fleeing the rebel-held areas defying LTTE orders was on the rise and over 62,000 internally displaced people (IDPs) have already entered the government-held areas since the beginning of 2009.

These IDPs are temporarily housed in welfare centres and villages in the northern Vavuniya, Mannar and Jaffna districts.

New computer model may help solve email overload in busy organizations, companies

Washington, March 7 (ANI): The problem of email overload in busy organizations and companies can be solved with the aid of a new computer model, say two Indian-origin researchers.

Ashish Gupta at Minnesota State University Moorhead, and Ramesh Sharda at Oklahoma State University, Stillwater, have described the model called Simulator for Interruptions and Message Overload in Network Environments (SIMONE) in the International Journal of Simulation and Process Modelling.

They say that SIMONE can produce a model of how email flows within a network of knowledge workers.

According to them, the simulation can be used to devise coping mechanisms for controlling information overload and interruptions associated with emails, two common problems faced by managers of knowledge workers.

“Email has become the most prevalent mode of business communication and information exchange within organizations, and has changed the way we spend our time at work,” the researchers say.

They further say that emails provides a cost-effective and open medium for sharing information and can improve time-effectiveness and efficiency by avoiding the need for many meetings and phone calls.

However, the researcher point out, recent reports have suggested that employees these days are spending increasing amounts of time handling email, time that may detract from their primary role within the organization.

According to them, recent business studies have also raised concerns about email overload, interruptions, technology addiction, attention deficiency, and productivity loss.

Conducting an array of tests on email systems with the help of SIMONE, Gupta and his colleagues came to the conclusion that managers may improve email efficiency simply by scheduling email processing times across an organization.

The researcher say that this approach avoids the inherent distraction of continual email interruptions throughout the working day, allowing employees to focus their efforts on primary tasks at other times.

They add that the solution also places emphasis on allowing time for necessary email, and thus removes pressure from employees who feel constantly obliged to check and respond to emails. (ANI)

CBI detaines CRPF DIG for irregularities in cops’ recruitment

New Delhi, Feb 25 (PTI) The CBI today detained a Deputy Inspector General of CRPF for his alleged involvement in irregularities in recruitment of constables in Uttar Pradesh. Vinod Sharma, a CRPF cadre officer, was detained by the agency late last night in Lucknow after conducting searches at his residence, CBI sources said.

The action against the DIG was taken after the investigating agency was tipped off by the CRPF itself about several complaints of irregularities. The CBI also raided the residence of a CRPF head constable, who was an accomplice of Sharma.

The recruitment of over 1,500 constables started nearly two months ago and the process was still on. There have been allegations that several candidates, who did not meet the set physical standards, were taken into the police force during the current recruitment process in which the DIG was the observer, they said.

PTI.