Let the force be with us: dyads exploit haptic coupling for coordination

People often perform actions that involve a direct physical coupling with another person, such as when moving furniture together. Here, we examined how people successfully coordinate such actions with others. We tested the hypothesis that dyads amplify their forces to create haptic information to coordinate. Participants moved a pole (resembling a pendulum) back and forth between two targets at different amplitudes and frequencies. They did so by pulling on cords attached to the base of the pole, one on each side. In the individual condition, one participant performed this task bimanually, and in the joint condition two participants each controlled one cord. We measured the moment-to-moment pulling forces on each cord and the pole kinematics to determine how well individuals and dyads performed. Results indicated that dyads produced much more overlapping forces than individuals, especially for tasks with higher coordination requirements. Thus, the results suggest that dyads amplify their forces to generate a haptic information channel. This likely reflects a general coordination principle in haptic joint action, where force amplification allows dyads to perform at the same level as individuals.     

Visual search patterns in trained and untrained novice drivers

As drivers become more experienced many changes have been observed in their patterns of visual search. Differences between novice and experienced drivers are particularly marked in demanding or hazardous road situations and this has led researchers to speculate that limitations in search patterns may explain some of the accidents where newly qualified drivers are involved. This paper reports a training intervention that informs novice drivers about their typical patterns of visual search and stresses the need for scanning multiple locations in the visual scene for sources of potential danger. Two groups of drivers were evaluated on three occasions over the course of their first year after gaining a full driving licence. The evaluations involved recording drivers' eye movements while driving a route on real roads in traffic, and while watching videos of hazardous situations. One of the groups received the training intervention before the second occasion of testing. The intervention produced notable changes in the drivers' search patterns in both situations though not all changes were still detectable at a final phase of testing three to six months after the intervention had been delivered.     

Cognitive style and relationship quality in married dyads

Recently, cognitive personality researchers have begun to explore the social and interpersonal relevance of cognitive individual difference variables. Embedded in these examinations, however, is a methodological issue that bears importantly on our understanding of the role of these cognitive orientations in social relations. Specifically, personality studies have typically employed experimentally created dyads which, by limiting the representativeness of the sample, potentially limits the generalizability of the findings to more enduring “real-life” dyads. In the present study, field dependence/field independence was examined as a potential mediator of relationship quality in married dyads. Consistent with Witkin's theory of psychological differentiation, it was predicted that spouses with relatively field-dependent partners and individuals from dyads with similar levels of differentiation would have fewer complaints. Results showed, contrary to the predictions, that husbands married to field-dependent wives and wives from matched dyads had more complaints about their marital relationships. These findings suggest the need for a careful evaluation of the role of cognitive style in the domain of intimate interpersonal relationships. Apparently, it may not be sufficient to generalize about the role of personality in social relationships from the results of studies employing experimentally created dyads or groups to other, more enduring and real-life types of social relationships.     

The sense of agency during skill learning in individuals and dyads

The sense of agency has received much attention in the context of individual action but not in the context of joint action. We investigated how the sense of agency developed during individual and dyadic performance while people learned a haptic coordination task. The sense of agency increased with better performance in all groups. Individuals and dyads showed a differential sense of agency after initial task learning, with dyads showing a minimal increase. The sense of agency depended on the context in which the task was first learnt, as transfer from joint to individual performance resulted in an illusory boost in the sense of agency. Whereas the quality of performance related to the sense of agency, the generated forces to achieve the task did not. Our findings are consistent with a predictive model account at the perceptual level, such that the sense of agency relies most strongly on sharable perceptual information.     

Difference without dominance: Children's talk in mixed- and same-sex dyads

This study explores whether third graders verbalize gender differences in dominance in mixed- and same-sex interaction. We tape-recorded the conversations of 43 pairs of Caucasian working-class children playing checkers in same- or mixed-sex conditions. Children appear to develop gender-differentiated speech styles. Boys brag and insult their opponents in both mixed- and same-sex conditions more often than do girls. Girls talk off-topic, interrupt, and laugh more in same-sex dyads than do boys or either, boys or girls in mixed-sex dyads. Gender differences in same-sex interaction were reflected in mixed-sex interaction. Although boys account for a larger proportion of direct requests and self-promoting speech in mixed-sex encounters, we failed to uncover substantial asymmetry in mixed-sex interaction, indicating that boys do not conversationally dominate girls in third grade. However, children were less mutually engaged in mixed-sex than in same-sex interactions, and girls especially showed less positive affect in mixed-sex dyads.     

Memory benefits during visual search depend on difficulty

In three experiments we explored whether memory for previous locations of search items influences search efficiency more as the difficulty of exhaustive search increases. Difficulty was manipulated by varying item eccentricity and item similarity (discriminability). Participants searched through items placed at three levels of eccentricity. The search displays were either identical on every trial (repeated condition) or the items were randomly reorganised from trial to trial (random condition), and search items were either relatively easy or difficult to discriminate from each other. Search was both faster and more efficient (i.e., search slopes were shallower) in the repeated condition than in the random condition. More importantly, this advantage for repeated displays was greater (1) for items that were more difficult to discriminate and (2) for eccentric targets when items were easily discriminable. Thus, increasing target eccentricity and reducing item discriminability both increase the influence of memory during search.     

Individuals and dyads in a multiple-cue judgment task: Cognitive processes and performance

Virtually all studies of multiple-cue judgment focus on the learning by individuals. In a multiple-cue judgment task the authors examined if people acquire rule or exemplar knowledge as a function of learning the task alone or in dyads. Learning in dyads was expected to promote explicit rule-based thinking as a consequence of verbalization (social abstraction effect) and to improve performance due to the larger joint exemplar knowledge base (exemplar pooling effect). In two experiments the results suggest more accurate judgment by dyads, evidence for an exemplar pooling effect, but no evidence for the social abstraction effect. In contrast to most previous research, social interaction proved beneficial and allowed the dyads to surpass their combined individual performance.     

The influence of cognitive load on spatial search performance

During search, executive function enables individuals to direct attention to potential targets, remember locations visited, and inhibit distracting information. In the present study, we investigated these executive processes in large-scale search. In our tasks, participants searched a room containing an array of illuminated locations embedded in the floor. The participants’ task was to press the switches at the illuminated locations on the floor so as to locate a target that changed color when pressed. The perceptual salience of the search locations was manipulated by having some locations flashing and some static. Participants were more likely to search at flashing locations, even when they were explicitly informed that the target was equally likely to be at any location. In large-scale search, attention was captured by the perceptual salience of the flashing lights, leading to a bias to explore these targets. Despite this failure of inhibition, participants were able to restrict returns to previously visited locations, a measure of spatial memory performance. Participants were more able to inhibit exploration to flashing locations when they were not required to remember which locations had previously been visited. A concurrent digit-span memory task further disrupted inhibition during search, as did a concurrent auditory attention task. These experiments extend a load theory of attention to large-scale search, which relies on egocentric representations of space. High cognitive load on working memory leads to increased distractor interference, providing evidence for distinct roles for the executive subprocesses of memory and inhibition during large-scale search.     

Suspending judgment to create value: Suspicion and trust in negotiation

This paper introduces a distinction between suspicion and distrust. While distrust (trust) involves having negative (positive) expectations about another’s motives, suspicion is defined as the state in which perceivers experience ambiguity about another’s motives. Four experiments supported this distinction and showed that suspicion can present greater benefits than trust for generating information search and attaining integrative agreements in negotiation. In Experiment 1a, suspicious perceivers were characterized by consciously attributing more motives to a target compared to both distrusting and trusting perceivers. In Experiment 1b, suspicious perceivers were more willing to seek information. In Experiment 2a, Suspicious-Trusting dyads achieved greater joint outcomes in face-to-face negotiation than did Trusting-Trusting or Suspicious-Suspicious dyads. Experiment 2b showed that the suspicious participants’ ability to seek information in Suspicious-Trusting dyads mediated the superior performance of Suspicious-Trusting dyads over Trusting-Trusting dyads in attaining integrative agreements.     

Response amendment in fencing: differences between elite and novice subjects

Reaction time (RT), movement time (MT), total response time (RMT), and accuracy of 3 elite and 3 novice fencers were studied under a dual response paradigm requiring a full lunge. Electromyographic activity (EMG) from selected arm and leg muscles was used to compare response profiles of the two groups. Although the elite subjects had slower MTs, their faster RTs resulted in significantly shorter total response times. The EMG analysis showed that in comparison to the novice subjects, onset of muscle activity was significantly faster for the elite group in five of the six muscles studied. In addition, the elite subjects showed more coherent muscle synergies and more consistent patterns of muscle coordination. Although the requirement to change targets (signalled by the arrival of a second stimulus) led to slightly more target misses for the elite group, the overall frequency was low, which indicates that it did not pose difficulty for either group. The present findings show that measures of response timing and neuromuscular coordination differentiate skill level in the fencing lunge and draw attention to practical implications for skill assessment and training.     

Autonomy and control in dyads: effects on interaction quality and joint creative performance

Two studies examined interaction quality and joint performance on two creative tasks in unacquainted dyads primed for autonomy or control orientations. It was hypothesized that autonomy-primed dyads would interact more constructively, experience more positive mood, and engage the task more readily, and as a result these dyads would perform better. To test this, Study 1 primed orientation and explored verbal creative performance on the Remote Associates Task (RAT). In Study 2, dyads were primed with autonomy and control orientation and videotaped during two joint creative tasks, one verbal (RAT) and one nonverbal (charades). Videotapes were coded for behavioral indicators of closeness and task engagement. Results showed that autonomy-primed dyads felt closer, were more emotionally and cognitively attuned, provided empathy and encouragement to partners, and performed more effectively. The effects of primed autonomy on creative performance were mediated by interpersonal quality, mood, and joint engagement.     

Sex-role orientation and relationship development in same-sex dyads

The purpose of the present study was to assess the relationship between sex-role identity, behavioral interaction, and interpersonal attraction in an initial extended encounter. Eighty-two female subjects identified as either feminine, androgynous, or undifferentiated participated in the study in same-sex dyads. The design contrasted three different dyad types: (a) feminine-feminine; (b) androgynous-androgynous; and (c) undifferentiated-undifferentiated. Each dyad completed an initial 5-min unstructured interaction, a 10-min getting-acquainted exercise, and a final 5-min unstructured interaction. Results of the combined initial and final unstructured interactions indicated greater interpersonal attraction between androgynous as compared with undifferentiated and feminine dyad types. During the interactions, androgynous individuals talked, looked at, and gestured to one another longer than did nonandrogynous individuals. There were, however, no significant differences between the feminine and undifferentiated dyads in interpersonal attraction or behavioral interaction. Discussion of the results emphasized the need to examine further the relationship between sex-role identity, behavioral interaction, and attraction in interpersonal encounters.     

The effect of waitresses' touch on alcohol consumption in dyads.

A total of 96 men and 48 women participated in a study on the effect of touch in the natural setting of public taverns in the United States. Participants in the same-gender (men-men) or mixed-gender dyads were either touched or not touched by waitress confederates. Regardless of dyad type, participants who were touched consumed more alcohol than participants who were not touched. Men in the mixed-gender dyads consumed more alcohol when the women was touched. Same-gender (men-men) dyads aggregately consumed more alcohol than mixed-gender dyads. The results are interpreted in terms of the environmental cues and the dynamics of the group.     

Embodied preference judgments: can likeability be driven by the motor system?

Can covert sensorimotor simulation of stimulus-relevant actions influence affective judgments, even when there is no intention to act? Skilled and novice typists picked which of two letter dyads they preferred. In each pair, one dyad, if typed using standard typing methods, would involve the same fingers (e.g., FV); the other would be typed with different fingers (e.g., FJ). Thus, if typed, dyads of the former kind should create more motor interference than dyads of the latter kind. Although individuals could not explain how the dyads differed, skilled typists preferred those typed with different fingers. Novices showed no preference. Moreover, a motor task performed while making dyad preference judgments attenuated skilled typists' preference--but only when the motor task involved the specific fingers that would be used to type the dyads. These findings suggest that in skilled typists, perceiving letters prompts covert sensorimotor simulation of typing them, which in turn influences affective judgments about this information.     

Early communication in dyads with visual impairment

The ability of dyads with restricted access to the visual channel of communication to establish a reliable pre‐linguistic communicative signalling system has traditionally been viewed as problematic. Such a conclusion is due in part to the emphasis that has been placed on vision as central to communication by traditional theory. The data presented in this paper question these assertions. The results of a longitudinal study exploring the nature of early dyadic interactions in dyads with visual impairment are presented. The dyads' use of three types of non‐visual behaviour—touch, vocalizations and facial orientation—were investigated in terms of their potential as alternatives to visual communication. It is argued that the results are evidence that visually impaired dyads engage in sophisticated communicative exchanges prior to infants' acquisition of language. Copyright © 2005 John Wiley & Sons, Ltd.     

You’re looking for what? Comparing search for familiar,nameable objects to search for unfamiliar,novel objects

Searching for items in one’s environment often includes considerable reliance on semantic knowledge. The present study examines the importance of semantic information in visual and memory search, especially with respect to whether the items reside in long-term or working memory. In Experiment 1, participants engaged in hybrid visual memory search for items that were either highly familiar or novel. Importantly, the relatively large number of targets in this hybrid search task necessitated that targets be stored in some form of long-term memory. We found that search for familiar objects was more efficient than search for novel objects. In Experiment 2, we investigated search for familiar versus novel objects when the number of targets was low enough to be stored in working memory. We also manipulated how often participants in Experiment 2 were required to update their target (every trial vs. every block) in order to control for target templates that were stored in long-term memory as a result of repeated exposure over trials. We found no differences in search efficiency for familiar versus novel objects when templates were stored in working memory. Our results suggest that while semantic information may provide additional individuating features that are useful for object recognition in hybrid search, this information could be irrelevant or even distracting when searching for targets stored in working memory.     

Changes in seatbelt use after licensing: a developmental hypothesis for novice drivers

This study tested the hypothesis that seatbelt use reflects a person's driving style or attitude towards safety, and that novice drivers' attitudes become inappropriate temporarily after licensing, and go back to being appropriate when more experience has been gained. We examined seatbelt use by university students (N=387) at a university parking lot for 19 days between April and November. Personal information about the participants was obtained from parking stickers and supplementary questionnaires asking about their driving history and attitudinal variables, such as self-assessed skill and safety. A longitudinal study indicated that seatbelt use decreased among novice drivers, but remained the same for more experienced drivers. Cross-sectional studies revealed a U curve change in seatbelt use after licensing. Regression analysis showed that overconfidence about driving skills accounted for the novice drivers' tendency to avoid using seatbelts. These results supported the hypothesis, especially for male novice drivers. The reason and implications of the changing attitude of novice drivers towards safety are discussed in terms of driver development.     

Complexity matching and coordination in individual and dyadic performance

Complexity matching is a measure of coordination based on information exchange between complex networks. To date, studies have focused mainly on interpersonal coordination, but complexity matching may generalize to interacting networks within individuals. The present study examined complexity matching in a double, coordinated Fitts' perceptual-motor task with comparable individual and dyadic conditions. Participants alternated touching targets with their left and right hands in the individual condition, or analogously with the left hand of one partner and the right hand of another in the dyadic condition. In Experiment 1, response coupling was manipulated by making targets drift either randomly or contingently based on prior responses. Here, drift refers to the variability in the target movements between response locations. Long-range correlations in time series of inter-response intervals exhibited complexity matching between the left and right hands of dyads and individuals. Response coupling was necessary for complexity matching in dyads but not individuals. When response coupling was absent in the dyadic condition, the degree of complexity matching was significantly reduced. Experiment 2 showed that the effect of coupling was due to interactions between left and right responses. Results also showed a weak, negative relationship between complexity matching and performance as measured by total response time. In conclusion, principles and measures of complexity matching apply similarly within and between individuals, and perceptual-motor performance can be facilitated by loose response coupling.     

Gender differences in interpersonal complementarity within roommate dyads

Complementarity theory proposes specific hypotheses regarding interpersonal styles that will result in successful relationships. The present study sought to extend previous research on gender differences in complementarity through the examination of same-sex peer dyads and the use of informant reports of interpersonal style. One hundred twenty participants (30 male and 30 female roommate dyads) completed interpersonal circumplex ratings of their roommates and a relationship cohesion measure. Examinations of complementarity indicate that women reported significantly more complementarity than men within their roommate dyads. However, for men and women, the closer the dyad was to perfect complementarity in terms of dominance, the more cohesive the relationship. Results are discussed in relation to gender differences in social development.     

Dynamics of frontal alpha asymmetry in mother-infant dyads: Insights from the Still Face Paradigm

The parent-infant dynamic has a foundational role in emotion regulation development. Electroencephalography (EEG) hyperscanning from mother-infant dyads can provide an unprecedented window into inter-brain dynamics during the parent-infant exchange. This potential depends on the feasibility of hyperscanning with dyads in emotionally taxing contexts. We sought to demonstrate feasibility of hyperscanning from 10 mother-infant dyads during the Still Face Procedure (SFP). We measured frontal alpha asymmetry (FAA) to elucidate ongoing regulatory dynamics and considered maternal caregiving quality as a window into dyads’ history. Results showed dyads exhibited a rightward shift in FAA over the course of SFP, indicating growing negative emotionality and desire to withdraw. Results also showed growing variability in FAA for infants over the course of SFP, indicating less active emotional control as stress ensued. Variability was especially low for mothers during periods when asked to be emotionally unavailable, suggesting active control to match the task demands. Dyads with a more responsive mother exhibited higher (more left) FAA relative to dyads with a less responsive mother, which might reflect a more positive emotional experience overall. We raise important methodological and theoretical questions that hyperscanning during SFP can address, such as the developmental origins of trait-like self-regulatory dispositions.