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Chad A. Mirkin, Northwestern University, George B. Rathmann Professor of Chemistry in the Weinberg College of Arts and Sciences. Photo by Bill Arsenault. 

DNA Blueprints Guide The Construction Of Specific Human Structures

Chad Mirkin discusses using DNA to build a three-dimensional structure out of gold, likening the process to building a house. Starting with basic materials such as bricks, wood, siding, stone and shingles, a construction team can build many different types of houses out of the same building blocks.
 
The article includes an audio recording of the full interview. Photo courtesy of the UCSD School of Medicine.
Babies Locate Their Limbs Early In Development Print E-mail
Medicine - Soc & Psych
TS-Si News Service   
Tuesday, 12 August 2008 16:30
Baby Standing In Crib
TS-Si Soc & Psych
Los Angeles, CA, USA. New research contributes an important insight into the way that babies understand the world around them and their place within it. The study suggests that babies as young as six or seven months are able to actively respond to stimuli and understand them in relation to their own bodies.
 
In a series of tests, low-frequency buzzers were placed in the hands of babies. Six month old babies would respond to a buzzer being set off by pulling-back or shaking the hand which held the activated buzzer. The tests were repeated with older babies who also looked towards the stimulated hand, indicating a further developed visual awareness.
 

Infants lost in (peripersonal) space? Andrew J. Bremner, Nicholas P. Holmes, Charles Spence. Trends in Cognitive Sciences 12(8) 298-305. ISSN: 1364-6613

 
The babies’ arms were then crossed to see if they were able to appreciate that their hands, and the buzzes, were not in their usual place. The older cohort was more likely than the younger group to recognise that their hands had been crossed to the other side of their body when responding to an activated buzzer. The younger group made more mistakes, showing less awareness that their limbs had moved.
 
Dr. Andrew Bremner from the Department of Psychology at Goldsmiths, University of London.The work was done by Dr. Andrew Bremner from the Department of Psychology at Goldsmiths, University of London and his colleagues. Their findings appear in Trends in Cognitive Sciences.
 
The results of this study suggest that at six months babies have some comprehension of the world around them and how they can respond to it. The study indicates that a spatial awareness of the body and its physical location, particularly where the limbs are, develops over the first year of life.
 
While cognitive development theorists such as Jean Piaget have long argued that babies develop through exploring the world with their senses, the question of how our understanding of our own bodies develops has received little consideration until now. The study shows that an awareness of peripersonal space — the way the body relates to its close environment, the space in which it can act — undergoes some significant developments in the first year of life.
 
Dr. Bremner says “Research in recent years has demonstrated that even very little babies know a lot about the outside world. This has led many to suggest that we are born with a great deal of the knowledge we need. But these new findings urge us to think differently about early development. Despite having a good grasp of what goes on in the outside world, young babies may have more difficulties in understanding how they themselves, and their bodies, fit into that world.”
 


Infants lost in (peripersonal) space? Andrew J. Bremner, Nicholas P. Holmes, Charles Spence. Trends in Cognitive Sciences 12(8) 298-305. ISSN: 1364-6613

Abstract

A significant challenge in developing spatial representations for the control of action is one of multisensory integration. Specifically, we require an ability to efficiently integrate sensory information arriving from multiple modalities pertaining to the relationships between the acting limbs and the nearby external world (i.e. peripersonal space), across changes in body posture and limb position. Evidence concerning the early development of such spatial representations points towards the independent emergence of two distinct mechanisms of multisensory integration. The earlier-developing mechanism achieves spatial correspondence by representing body parts in their typical or default locations, and the later-developing mechanism does so by dynamically remapping the representation of the position of the limbs with respect to external space in response to changes in postural information arriving from proprioception and vision.

 
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Last Updated on Tuesday, 12 August 2008 05:13