Raising the Ante of Communication: Evidence for Enhanced Gesture Use in High Stakes Situations

Teachers' Gestures and How They Matter

How do teachers' gestures influence students' learning? This article reviews research investigating the role of gestures in communication, focusing on teachers' communication with their students, primarily in mathematics and science instruction. We first briefly consider gesture's role in communication more generally as a backdrop for considering teaching as a special context for communication. We then describe teachers' spontaneous gesturing in teaching contexts, and we consider how teachers' spontaneous gestures might influence students' learning. We then consider experimental studies that provide causal support for the effects of teachers' gestures on students' learning. We conclude by discussing future directions and implications for educational practice.

A multi-scale investigation of the human communication system's response to visual disruption

In human communication, when the speech is disrupted, the visual channel (e.g. manual gestures) can compensate to ensure successful communication. Whether speech also compensates when the visual channel is disrupted is an open question, and one that significantly bears on the status of the gestural modality. We test whether gesture and speech are dynamically co-adapted to meet communicative needs. To this end, we parametrically reduce visibility during casual conversational interaction and measure the effects on speakers' communicative behaviour using motion tracking and manual annotation for kinematic and acoustic analyses. We found that visual signalling effort was flexibly adapted in response to a decrease in visual quality (especially motion energy, gesture rate, size, velocity and hold-time). Interestingly, speech was also affected: speech intensity increased in response to reduced visual quality (particularly in speech-gesture utterances, but independently of kinematics). Our findings highlight that multi-modal communicative behaviours are flexibly adapted at multiple scales of measurement and question the notion that gesture plays an inferior role to speech.

Gesture, communication, and adult acquired hearing loss

Nonverbal communication, specifically hand and arm movements (commonly known as gesture), has long been recognized and explored as a significant element in human interaction as well as potential compensatory behavior for individuals with communication difficulties. The use of gesture as a compensatory communication method in expressive and receptive human communication disorders has been the subject of much investigation. Yet within the context of adult acquired hearing loss, gesture has received limited research attention and much remains unknown about patterns of nonverbal behaviors in conversations in which hearing loss is a factor. This paper presents key elements of the background of gesture studies and the theories of gesture function and production followed by a review of research focused on adults with hearing loss and the role of gesture and gaze in rehabilitation. The current examination of the visual resource of co-speech gesture in the context of everyday interactions involving adults with acquired hearing loss suggests the need for the development of an evidence base to effect enhancements and changes in the way in which rehabilitation services are conducted.

Communicative Context Affects Use of Referential Prosody

The current study assessed the extent to which the use of referential prosody varies with communicative demand. Speaker-listener dyads completed a referential communication task during which speakers attempted to indicate one of two color swatches (one bright, one dark) to listeners. Speakers' bright sentences were reliably higher pitched than dark sentences for ambiguous (e.g., bright red versus dark red) but not unambiguous (e.g., bright red versus dark purple) trials, suggesting that speakers produced meaningful acoustic cues to brightness when the accompanying linguistic content was underspecified (e.g., "Can you get the red one?"). Listening partners reliably chose the correct corresponding swatch for ambiguous trials when lexical information was insufficient to identify the target, suggesting that listeners recruited prosody to resolve lexical ambiguity. Prosody can thus be conceptualized as a type of vocal gesture that can be recruited to resolve referential ambiguity when there is communicative demand to do so.

A speaker's gesture style can affect language comprehension: ERP evidence from gesture-speech integration

In face-to-face communication, speech is typically enriched by gestures. Clearly, not all people gesture in the same way, and the present study explores whether such individual differences in gesture style are taken into account during the perception of gestures that accompany speech. Participants were presented with one speaker that gestured in a straightforward way and another that also produced self-touch movements. Adding trials with such grooming movements makes the gesture information a much weaker cue compared with the gestures of the non-grooming speaker. The Electroencephalogram was recorded as participants watched videos of the individual speakers. Event-related potentials elicited by the speech signal revealed that adding grooming movements attenuated the impact of gesture for this particular speaker. Thus, these data suggest that there is sensitivity to the personal communication style of a speaker and that affects the extent to which gesture and speech are integrated during language comprehension.