Yale Bulletin and Calendar

May 24, 2002Volume 30, Number 30Two-Week Issue



Studies of infants suggest humans have an innate ability to count. Here, 7-month-old Yasmina Debos does the math.



Research offers new proof that babies can count

Babies who look longer at certain objects are counting, not just looking at new shapes and textures, according to a study by Yale University researchers.

Karen Wynn and Paul Bloom, professors of psychology, say their study was intended to address the debate about whether infants are counting when they look at objects, or whether they are simply responding to color, size and other variables.

"We report here a study showing that 5-month-olds can determine the number of collective entities, moving groups of items, when non-numerical perceptual factors such as contour length, area, density and others are strictly controlled," Wynn says in the study published this month in the journal Cognition. "This suggests both that infants can represent number per se, and that their grasp of number is not limited to the domain of objects."

To substantiate her theory that infants are capable of distinguishing between different numbers of objects, and of performing simple arithmetical operations, Wynn's research group tested the infants in two phases. The 24 infants, ranging in age from 4 months to 5 months of age, were tested while seated before a computer screen.

During the first phase, known as the habituation phase, Wynn and Bloom repeatedly presented half the babies with two groups of three objects each and half with four groups of three objects each. The objects were red, filled-in circles about the size of a dime.

In the second phase, all of the infants were presented with two kinds of tests: trials depicting two collections of four objects each, and trials depicting four collections of two objects each.

Wynn and Bloom predicted that those infants habituated to two collections would look longer at four collections during the second phase, while those habituated to four collections would look longer at two collections during the second phase. An analysis of the infants' looking times revealed this pattern of preferences.

"What we found was the infants looked significantly longer on trials showing a new number of groups than what they had been exposed to in the habituation phase," she says. "We concluded from this that babies were sensitive to the number of groups in the display, which means they were definitely responding to the number of groups, not the total amount of area or contour length."

Wynn says the study, funded by the National Institute of Child Health and Human Development, is intended to answer questions about the foundation of human mathematical knowledge.

"If we have a good understanding of what the initial mental machinery is that gives us our toehold into the realm of number, then we will be in a better position to, for example, develop educational curricula that build on those foundations in a coherent way," she says. "It will also tell us if we are trying to teach kids material that conflicts with those foundations."

Coauthors of the study included Wen-Chi Chiang of the National Chung-Cheng University in Taiwan.

-- By Jacqueline Weaver


T H I SW E E K ' SS T O R I E S

Yale strengthens ties with Mexico during Levin's visit

Mexican doctoral students at Yale to receive added financial support

Yale research on Maya murals presented to Mexican anthropologists

Yale scientist Jerry Woodall wins National Medal of Technology

Carm Cozza named to College Football Hall of Fame

Yale physicist Devoret helps create 'artificial atom'


ENDOWED PROFESSORSHIPS

Stuart Schwartz to be new master of Ezra Stiles College

IN FOCUS: Yale University Health Services Center

Research offers new proof that babies can count

São Toméan president and new World Fellow visit campus

Joan Steitz honored for her work with 'snurps'

Alumni reunions feature talks, tours, music and more

Works by '1952's Authors and Artists' to be displayed

Graduate School will honor three faculty members for their mentoring

Library exhibit marks milestone for monarchy

Paintings by award-winning artist on view at Slifka Center

Graduate students get practical advice on interview etiquette

Longtime city resident named head of University Properties

Dwight Hall Management Fellows to oversee center's fundraising

Art gallery to showcase 'outsider art' at special fundraising event . . .

Tennis coach Alex Dorato is honored as 2001 New England Coach of the Year

City gallery features national exhibition juried by Yale sculptor

Commencement Information



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