Individual differences in preschool children's knowledge of superordinate categories

The present study assesses intensional knowledge of superordinate categories in preschool children. This assessment is part of a larger programmatic research effort aimed at the development of a cognitive preschool screening test to detect learning problems prior to their manifestation in school failure. Necessary prerequisites for including intensional superordinate category knowledge as a potential component of this screening test are addressed: (a) Are there substantial variations in this knowledge across preschool children? (b) Can the knowledge be measured reliably using game-like picture tasks? (c) Do individual differences in this knowledge relate to the child's current level of intellectual functioning? An underlying assumption for the development of this screening test is that assessing gradually emerging abstract knowledge that develops through active, ongoing processing is more likely to predict learning problems than assessing knowledge that develops through rote associative learning. Consistent with this approach was the prediction that one component of intension, knowledge of differences, would be a better predictor of current functioning than knowledge of similarities. The data support this contention. Although both knowledge of similarities and differences was stable within an individual, variable among individuals and highly correlated with each other, only knowledge of differences related to the child's concurrent level of intellectual functioning.     

Visual-spatial processing in deaf brain-damaged signers

Sign language displays all the complex linguistic structure found in spoken languages, but conveys its syntax in large part by manipulating spatial relations. This study investigated whether deaf signers who rely on a visual-spatial language nonetheless show a principled cortical separation for language and nonlanguage visual-spatial functioning. Four unilaterally brain-damaged deaf signers, fluent in American Sign Language (ASL) before their strokes, served as subjects. Three had damage to the left hemisphere and one had damage to the right hemisphere. They were administered selected tests of nonlanguage visual-spatial processing. The pattern of performance of the four patients across this series of tests suggests that deaf signers show hemispheric specialization for nonlanguage visual-spatial processing that is similar to hearing speaking individuals. The patients with damage to the left hemisphere, in general, appropriately processed visual-spatial relationships, whereas, in contrast, the patient with damage to the right hemisphere showed consistent and severe visual-spatial impairment. The language behavior of these patients was much the opposite, however. Indeed, the most striking separation between linguistic and nonlanguage visual-spatial functions occurred in the left-hemisphere patient who was most severely aphasic for sign language. Her signing was grossly impaired, yet her visual-spatial capacities across the series of tests were surprisingly normal. These data suggest that the two cerebral hemispheres of congenitally deaf signers can develop separate functional specialization for nonlanguage visual-spatial processing and for language processing, even though sign language is conveyed in large part via visual-spatial manipulation.     

Value and uncertainty as weighting factors in impression formation

An experiment was conducted to compare mathematical models describing how people combine information to form an impression of another person. Subjects rated how much they would like stimulus persons described by one or two adjectives. Subjects also reported their level of uncertainty about each evaluation. Models using the uncertainty measures to predict integration weights were no more successful than the equal weight averaging model. There was no evidence that extreme adjectives were given high weight. Information integration was best described by a model in which the more negative adjective in a pair is given more weight than the other adjective.     

The miscommunication of deception: An adaptive perspective

Undergraduates were videotaped as they told lies and truths about their last job. Later, these undergraduates viewed the videotape and tried to guess which of their fellow subject were lying. Monetary incentives had been offered for successful lying and lie detection. Our subjects showed a “demeanor bias”—some looked honest even when they were lying; others looked dishonest even when they were telling the truth. These differences in apparent honesty were the primary determinant of deception judgments; perceivers' detection skills played a lesser role. Honest-looking subjects were predisposed to perceive others as dishonest. In general, our liars used hand gestures, maintained eye contact, and refrained from smiling. Perceivers misconstrued these behaviors as signs of honesty and could not often detect deceit—unless the lie was being told by a subject who had earlier told the truth. We draw on sociobiological concepts and offer an adaptive perspective on human deceit.     

Cognitive and motivational determinants of children's humor responses

Cognitive and motivational influences on children's humor responses were examined. Forty-eight Caucasian children from three economically heterogeneous schools were tested. Equal numbers of middle SES and lower SES boys and girls from kindergarten and third grade were shown 12 aggression and dependency cartoons of different difficulty levels. Three responses to each cartoon were recorded: mirth, funniness rating, and comprehension score. Results support aspects of both psychodynamic and cognitive theories of humor response. All children preferred aggressive themes to dependency themes, and third graders especially showed attenuated response to dependency cartoons. Funniness ratings decreased as difficulty levels increased. IQ, as assessed by the Peabody Picture Vocabulary Test-R, was positively related to humor. Mirth responses and funniness ratings increased as comprehension increased.