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New child development theory bridges nature vs. nurture; parental guidance shapes child’s strengths

How a child turns out determined by nature, nurture — and parental guidance shaped by child’s strengths

Why does a child grow up to become a lawyer, a politician, a professional athlete, an environmentalist or a churchgoer?

It’s determined by our inherited genes, say some researchers. Still others say the driving force is our upbringing and the nurturing we get from our parents.

But a new child-development theory bridges those two models, says psychologist George W. Holden at Southern Methodist University in Dallas. Holden’s theory holds that the way a child turns out can be determined in large part by the day-to-day decisions made by the parents who guide that child’s growth.

“This model helps to resolve the nature-nurture debate,” Holden says. “Effective parents are taking nature into account in their nurturing. It’s a slightly different twist.”

Parental guidance is key
Child development researchers largely have ignored the importance of parental “guidance,” Holden says. In his model, effective parents observe, recognize and assess their child’s individual genetic characteristics, then cultivate their child’s strengths.

“It’s been said that parents are the ‘architect’ or the ‘conductor’ of a child’s development. There are lots of different synonyms, but the terms don’t capture the essence that parents are trying to ‘guide,'” Holden says. “Some parents have more refined goals — like wanting their child to be an athlete or to have a particular career. Some have more general goals — such as not wanting their child to become a criminal. But all are positive goals.”

Holden describes and explains his theory and research in the article “Childrearing and Developmental Trajectories: Positive Pathways, Off-ramps, and Dynamic Processes” in the current issue of the journal Child Development Perspectives. The theory is also detailed in his child psychology textbook, “Parenting, A Dynamic Perspective,” published by Sage Publications Inc., 2010.

Parents help or hinder progress
In decades past, researchers have studied many aspects of parenting that Holden describes as “unidimensional” and easier to quantify than guidance. Examples include: how parents reinforce their children’s behavior, punish their children or show them love and warmth.

Only in the last decade have researchers studied the role parents play in helping or hindering their child’s progress toward — or abandonment of — a particular course of development, he says.

“It’s not an easy set of behaviors to observe and quantify because it’s more complex in that it relates to parental goals that they have for their children,” he says. “It’s also multi-faceted. It’s not a simple unitary behavior that can be easily and reliably counted up. So there are methodological reasons it hasn’t been studied, and there are also biases and theoretical orientations that have neglected this.”

The time has come, however, to understand the impact of parental guidance, Holden says. Sophisticated statistical procedures now allow new research techniques such as growth-curve modeling and group-based trajectory analysis. Other child development experts have ventured into the interaction between child and parent trajectories, says Holden. He hopes many more will join in advancing the concept, which he considers critical to understanding child development.

“I’m certainly not the first to think of this, but I’ve framed it a little differently and a little more comprehensively than it’s been discussed before,” Holden says. “I’m sure there are things I haven’t thought of, so hopefully this will generate discussion, research and modification. And I hope it will trickle down to parents so they can see the critical role they can play in helping their children develop in positive ways.”

Pathways or trajectories
In his conceptual framework, Holden hypothesizes that parents guide their children’s development in four complex and dynamic ways:

  • Parents initiate trajectories, sometimes trying to steer their child in a preferred developmental path based on either the parents’ preferences or their observations of the child’s characteristics and abilities, such as enrolling their child in a class, exposing them to people and places, or taking a child to practices or lessons;
  • Parents also sustain their child’s progress along trajectories with encouragement and praise, by providing material assistance such as books, equipment or tutoring, and by allocating time to practice or participate in certain activities;
  • Parents mediate trajectories, which influences how their child perceives and understands a trajectory, and help their child steer clear of negative trajectories by preparing the child to deal with potential problems;
  • Finally, parents react to child-initiated trajectories.

Trajectories are useful images for thinking about development because one can easily visualize concepts like “detours,” “roadblocks” and “off-ramps,” Holden says. Detours, he says, are transitional events that can redirect a pathway, such as divorce. Roadblocks are events or behavior that shut down a potential trajectory, such as teen pregnancy, which can block an educational path. Off-ramps are exits from a positive trajectory, such as abusing drugs, getting bullied or joining a gang.

Holden says there are other ways parents influence a child’s progress on a trajectory, such as through modeling desired behaviors, or modifying the speed of development by controlling the type and number of experiences.

Some of the ways in which children react to trajectories include accepting, negotiating, resisting or rejecting them, he says.

“Some factors that also can influence trajectories include the family’s culture, their income and family resources, and the quality of the parent-child relationship,” says Holden. “What this model of parenting helps to point out is that effective parenting involves guiding children in such a way as to ensure that they are developing along positive trajectories.”

Holden is a professor in the SMU Department of Psychology. — Margaret Allen

SMU has an uplink facility on campus for live TV, radio or online interviews. To speak with Dr. Holden or to book him in the SMU studio, call SMU News & Communications at 214-768-7650.

SMU is a private university in Dallas where nearly 11,000 students benefit from the national opportunities and international reach of SMU’s seven degree-granting schools. For more information see www.smu.edu.

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CBS 11 DFW: Doctors using fiber optics for prosthetic limbs

CBS Channel 11 in Dallas-Fort Worth covered the research of SMU engineers Marc Christensen and Volkan Otugen who are working to develop technology that will someday help amputees have “feeling” in their artificial limbs.

The research is funded through a $5.6 million grant from the U.S. Department of Defense and industry for a center led by SMU’s Lyle School of Engineering. The goal is to develop revolutionary technology for advanced prosthetic limbs that will help amputees returning from war in Iraq and Afghanistan.

Two-way fiber optic communication between prosthetic limbs and peripheral nerves will be key to operating realistic robotic arms, legs and hands that not only move like the real thing, but also “feel” sensations like pressure and heat.

CBS Channel 11’s coverage aired Nov. 30: “Doctors Using Fiber Optics For Prosthetic Limbs.”

Read the full story.

EXCERPT:

By Keith Garvin
CBSDFW.COM

Imagine not being able to pick up a drink, a pen, or even hold a spouse’s hand. For thousands of North Texans living as amputees, that is reality. But, some local engineers are teaming up with medical science to help transform that reality and change lives.

Bernie Diamond of Fort Worth is the picture of health. The former fitness model turned hairdresser was on top of his game. But, three years ago, everything changed in a split second when he was randomly shot while standing outside a home in Dallas.

“I got shot at such a perfect angle that it shot through the wrist and blew out the entire back of my hand,” Diamond said.

After many surgeries and attempts to rehabilitate his left hand, Diamond and his doctors made the decision to amputate his hand just above the wrist.

“I remember I was crying the entire time saying please don’t take my hand, please don’t take my hand,” Diamond said.

He had to learn to function with a prosthetic replacement, which doesn’t allow for much movement. But, that’s what researchers at Southern Methodist University and the University of North Texas are trying to change.

“Today we have very sophisticated robotic arms,” explained Marc Christensen, chair of the electrical engineering department at SMU. “What we’re lacking is a good interface to control them.”

Dr. Gunter Gross at UNT, and Doctors Christensen and Volkan Otugen at SMU are working to create a system of fiber-optic wires and sensors that can replace the vast network of nerves inside a limb.

“It’s a link to send and receive information between the brain and the limb,” explained Dr. Otugen, chair of the mechanical engineering department at SMU.

Read the full story.

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New Scientist: Robot limbs to plug into the brain with light

A new $5.6 million center funded by the U.S. Department of Defense and industry is led by SMU’s Lyle School of Engineering to develop revolutionary technology for advanced prosthetic limbs that will help amputees returning from war in Iraq and Afghanistan.

Two-way fiber optic communication between prosthetic limbs and peripheral nerves will be key to operating realistic robotic arms, legs and hands that not only move like the real thing, but also “feel” sensations like pressure and heat.

Journalist David Hambling in New Scientist magazine reported on the technology and the research center in the Oct. 17 article “Robot limbs to plug into the brain with light.”

The center is led by Marc Christensen, chair of the Department of Electrical Engineering in SMU’s Bobby B. Lyle School of Engineering.

Read the full story.

Excerpt:

By David Hambling
New Scientist
Imagine a bionic arm that plugs directly into the nervous system, so that the brain can control its motion, and the owner can feel pressure and heat through their robotic hand. This prospect has come a step closer with the development of photonic sensors that could improve connections between nerves and prosthetic limbs.

Existing neural interfaces are electronic, using metal components that may be rejected by the body. Now Marc Christensen at Southern Methodist University in Dallas, Texas, and colleagues are building sensors to pick up nerve signals using light instead. They employ optical fibres and polymers that are less likely than metal to trigger an immune response, and which will not corrode.

The sensors are currently in the prototype stage and too big to put in the body, but smaller versions should work in biological tissue, according to the team.

Whisper light
The sensors are based on spherical shells of a polymer that changes shape in an electric field. The shells are coupled with an optical fibre, which sends a beam of light travelling around inside them.

The way that the light travels around the inside of the sphere is called a “whispering gallery mode”, named after the Whispering Gallery in St Paul’s Cathedral, London, where sound travels further than usual because it reflects along a concave wall.

The idea is that the electric field associated with a nerve impulse could affect the shape of the sphere, which will in turn change the resonance of the light on the inside of the shell; the nerve effectively becomes part of a photonic circuit. In theory, the change in resonance of the light travelling through the optical fibre could tell a robotic arm that the brain wants to move a finger, for instance.

Signals could be carried in the other direction by shining infrared light directly onto a nerve — this is known to stimulate nerves — guided by a reflector at the tip of the optical fibre.

Read the full story.

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Dallas Observer: SMU, DOD Partner Again, This Time on Prosthetics That Feel

The Dallas Observer on its Unfair Park blog took note of the SMU-led Neurophotonics Research Center being funded by the Department of Defense and industry with a $5.6 million grant.

In the Sept. 13 entry, Journalist Robert Wilonsky explained details of the project to Observer readers and quoted Marc Christensen, electrical engineering chair in SMU’s Lyle School of Engineering.

“Enhancing human performance with modern digital technologies is one of the great frontiers in engineering. Providing this kind of port to the nervous system will enable not only realistic prosthetic limbs, but also can be applied to treat spinal cord injuries and an array of neurological disorders,” Christensen is quoted.

EXCERPT:
By Robert Wilonsky
SMU and the Department of Defense are already partners on that paper-thin camera straight outta 1984 by way of Minority Report. Now the Hilltop sends word of its latest DOD partnership — a $5.6-mil Neurophotonics Research Center that’ll be run by Marc Christensen, electrical engineering chair in SMU’s Lyle School of Engineering. Its charge: to develop prosthetic limbs using fiber optics that actually feel things like pressure and temperature. Says SMU: “Lightning-fast connections between robotic limbs and the human brain may be within reach for injured soldiers and other amputees.”

Read the full story.

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SMU leads $5.6M research center for fiber optic interface to link robotic limbs, human brain

DOD, industry fund $5.6 million SMU-led research center; Lyle School technology drives development of advanced prosthetics

Lightning-fast connections between robotic limbs and the human brain may be within reach for injured soldiers and other amputees with the establishment of a multimillion-dollar research center led by SMU engineers.

Funded by a Department of Defense initiative dedicated to audacious challenges and intense time schedules, the Neurophotonics Research Center will develop two-way fiber optic communication between prosthetic limbs and peripheral nerves.

This connection will be key to operating realistic robotic arms, legs and hands that not only move like the real thing, but also “feel” sensations like pressure and heat.

Successful completion of the fiber optic link will allow for sending signals seamlessly back and forth between the brain and artificial limbs, allowing amputees revolutionary freedom of movement and agility.

Potential to patch injured spinal cord

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Partners in the Neurophotonics Research Center also envision man-to-machine applications that extend far beyond prosthetics, leading to medical breakthroughs like brain implants for the control of tremors, neuro-modulators for chronic pain management and implants for patients with spinal cord injuries.

The researchers believe their new technologies can ultimately provide the solution to the kind of injury that left actor Christopher Reeve paralyzed after a horse riding accident. “This technology has the potential to patch the spinal cord above and below a spinal injury,” said Marc Christensen, center director and electrical engineering chair in SMU’s Lyle School of Engineering. “Someday, we will get there.”

The Defense Advanced Research Projects Agency (DARPA) is funding the $5.6 million center with industry partners as part of its Centers in Integrated Photonics Engineering Research (CIPhER) project, which aims to dramatically improve the lives of the large numbers of military amputees returning from war in Iraq and Afghanistan.

Currently available prosthetic devices commonly rely on cables to connect them to other parts of the body for operation — for example, requiring an amputee to clench a healthy muscle in the chest to manipulate a prosthetic hand. The movement is typically deliberate, cumbersome, and far from lifelike.

A link compatible with living tissue
The goal of the Neurophotonics Research Center is to develop a link compatible with living tissue that will connect powerful computer technologies to the human nervous system through hundreds or even thousands of sensors embedded in a single fiber.

Unlike experimental electronic nerve interfaces made of metal, fiber optic technology would not be rejected or destroyed by the body’s immune system.

“Enhancing human performance with modern digital technologies is one of the great frontiers in engineering,” said Christensen. “Providing this kind of port to the nervous system will enable not only realistic prosthetic limbs, but also can be applied to treat spinal cord injuries and an array of neurological disorders.”

The center brings together researchers from SMU, Vanderbilt University, Case Western Reserve University, the University of Texas at Dallas and the University of North Texas.

The Neurophotonics Research Center’s industrial partners include Lockheed Martin (Aculight), Plexon, Texas Instruments, National Instruments and MRRA.

Integrated system at cellular level
Together, this group of university and industry researchers will develop and demonstrate new increasingly sophisticated two-way communication connections to the nervous system.

Every movement or sensation a human being is capable of has a nerve signal at its root. “The reason we feel heat is because a nerve is stimulated, telling the brain there’s heat there,” Christensen said.

The center formed around a challenge from the industrial partners to build a fiber optic sensor scaled for individual nerve signals: “Team members have been developing the individual pieces of the solution over the past few years, but with this new federal funding we are able to push the technology forward into an integrated system that works at the cellular level,” Christensen said.

The research builds on partner universities’ recent advances in light stimulation of individual nerve cells and new, extraordinarily sensitive optical sensors being developed at SMU. Volkan Otugen, SMU site director for the center and Lyle School mechanical engineering chair, has pioneered research on tiny spherical devices that sense the smallest of signals utilizing a concept known as “whispering gallery modes.” A whispering gallery is an enclosed circular or elliptical area, like that found beneath an architectural dome, in which whispers can be heard clearly on the other side of the space.

Ultimate combination for two-way interface
The ultimate combination of advanced optical nerve stimulation and nerve-sensing technologies will create a complete, two-way interface that does not currently exist. “It will revolutionize the field of brain interfaces,” Christensen said.

“Science fiction writers have long imagined the day when the understanding and intuition of the human brain could be enhanced by the lightning speed of computing technologies,” said Geoffrey Orsak, dean of the SMU Lyle School of Engineering. “With this remarkable research initiative, we are truly beginning a journey into the future that will provide immeasurable benefits to humanity.”

A private university located in the heart of Dallas, SMU is building on the vision of its founders, who in 1911 imagined a distinguished center for learning emerging from the spirit of the city. Today, nearly 11,000 students benefit from the national opportunities and international reach afforded by the quality of SMU’s seven degree-granting schools. — Kimberly Cobb

SMU has an uplink facility located on campus for live TV, radio, or online interviews. To speak with Marc Christensen or to book a live or taped interview in the studio, call SMU News & Communications at 214-768-7650 or email news@smu.edu.