Infant s Examination and Manipulation of Objects
Infant s Examination and Manipulation of Objects
This study will explore how babies become able to use their experience with objects to plan
 to manipulate them appropriately. For example, an adult knows that picking up a grocery bag
 full of canned food requires different actions than are needed for lifting an empty bag. This
 study will examine when and how infants first begin to adapt their actions to manipulate
 specific objects that weigh different amounts.

 Participants will include normal healthy babies within 2 weeks of their first birthday. If
 the expected results are obtained from testing, 9-month-old children will then be studied to
 identify a lower age boundary in task performance. If the expected results are not obtained
 at the 12-month test age, older children will be recruited to participate.

 The study involves one 30-minute session with the baby and his or her mother or father. The
 parent will answer some questions about the family, such as its size and ethnic make-up. The
 infant will then have small magnetic sensors taped to the underside of each arm and to the
 back. While sitting on the parent s lap, the infant will be presented with plastic toys, and
 his or her actions will be measured by the sensors as he or she reaches for and picks up the
 toys. The sensors will be connected to a computer that will track and record the motion of
 the infant s arms.

 ...
The major objective of this research is to better understand the functional significance of
 object categorization in early development. The proposed work is designed to examine the
 emergence of infants ability to access internal categorical representations in service of
 planning actions on the external environment. Representation, in this capacity, refers simply
 to stored information that can influence later behavior. Categorization refers to the
 treatment of discriminable objects as equivalent in some way. Even very young infants appear
 able to visually categorize diverse sets of discriminable patterns or objects, and can form
 internal representations of such bounded collections. Much less is known, however, about
 infants ability to actually utilize such representations in the guidance of goal directed
 action. The present research is designed to characterize the functional and behavioral
 significance of object representations in infancy, focusing particularly on categorically
 organized representations. The primary research strategy to be used consists of analyzing
 infants examination and manipulation of novel objects that vary both in visual (i.e., shape
 and color) as well as nonvisual dimensions (i.e., weight). In a laboratory procedure,
 twelve-month old infants will explore novel objects of different weights, and their
 subsequent handling of modified test objects will be measured with an electronic motion
 analysis system. Kinematic analyses of infants actions on the test objects will reveal how
 these actions were prepared in relation to their previous experience with similar objects.
-  INCLUSION CRITERIA:

 Infants will be selected for inclusion in each study on the basis of age, gestational
 status (i.e., full-term vs. pre-term birth), visual normality, and general health status.

 The initial group will be recruited to participate within two weeks on either side of their
 first birthday (12 months of age).

 Equal numbers of males and females will be recruited to participate. If the sample
 participating in either experiment fails to perform in the manner expected, additional
 participants will be recruited at older test ages to identify when in the course of
 development such behavioral guidance emerges. As successive test ages will be separated by
 6 month intervals, independent samples of 18-, then 24-month-old children will be recruited
 until the expected pattern of adaptive actions is observed (cf. Fossberg, et al., 1992).

 EXCLUSION CRITERIA:

 Infants with a gestational age of less than 36 weeks, and/or those with histories of severe
 perinatal complications, visual abnormalities, or congenital developmental disorders will
 not be recruited for participation.