Do you have to be right to redescribe?

Gestures, but not meaningless movements, lighten working memory load when explaining math

Gesturing is ubiquitous in communication and serves an important function for listeners, who are able to glean meaningful information from the gestures they see. But gesturing also functions for speakers, whose own gestures reduce demands on their working memory. Here we ask whether gesture's beneficial effects on working memory stem from its properties as a rhythmic movement, or as a vehicle for representing meaning. We asked speakers to remember letters while explaining their solutions to math problems and producing varying types of movements. Speakers recalled significantly more letters when producing movements that coordinated with the meaning of the accompanying speech, i.e., when gesturing, than when producing meaningless movements or no movement. The beneficial effects that accrue to speakers when gesturing thus seem to stem not merely from the fact that their hands are moving, but from the fact that their hands are moving in coordination with the content of speech.

Understanding conceptual development along the implicit-explicit dimension: looking through the lens of the representational redescription model

This study examined conceptual changes in children in the dimension of explicitness through the lens of the representational redescription model (A. Karmiloff-Smith, 1986, 1992). The 4- to 9-year-old participants (N = 24) had to balance blocks on a narrow support in one task and predict whether the blocks could be balanced in another task. In addition to the application of a microgenetic approach, various new methods were introduced to capture fine-grained changes in explicitness. Explicit understanding and behavioral performance were assessed separately with different measures. By using an adapted prediction task in a new way, evidence supporting the existence of an intermediate level of explicitness (Level E1) was found. The results also supported the existence of implicit-to-explicit development. The findings imply that the development of conceptual explicitness deserves further investigation.

More gestures than answers: Children learning about balance

This research extends the range of domains within which children's gestures are found to play an important role in learning. The study involves children learning about balance, and the authors locate children's gestures within a relevant model of cognitive development--the representational redescription model (A. Karmiloff-Smith, 1992). The speech and gestures of children explaining a balance task were examined. Approximately one third of the children expressed one idea in speech and another in gesture. These children made significantly more learning gains than children whose gestures and speech matched. Children's gestures were an indicator, at pretest, of readiness to learn and of cognitive gains. The authors conclude that children's gestures provide crucial insight into their cognitive state and illuminate the process of learning and representational change.