Interpersonal Physiological Synchrony for Detecting Moments of Connection in Persons With Dementia: A Pilot Study

Interpersonal physiological synchrony has been successfully used to characterize social interactions and social processes during a variety of interpersonal interactions. There are a handful of measures of interpersonal physiological synchrony, but those that exist have only been validated on able-bodied adults. Here, we present a novel information-theory based measure of interpersonal physiological synchrony—normalized Symbolic Transfer Entropy (NSTE)—and compare its performance with a popular physiological synchrony measure—physiological concordance and single session index (SSI). Using wearable sensors, we measured the electrodermal activity (EDA) of five individuals with dementia and six able-bodied individuals as they participated in a movement activity that aimed to foster connection in persons with dementia. We calculated time-resolved NSTE and SSI measures for case studies of three dyads and compared them against moments of observed interpersonal connection in video recordings of the activity. Our findings suggest that NSTE-based measures of interpersonal physiological synchrony may provide additional advantages over SSI, including resolving moments of ambiguous SSI and providing information about the direction of information flow between participants. This study also investigated the feasibility of using interpersonal synchrony to gain insight into moments of connection experienced by individuals with dementia and further encourages exploration of these measures in other populations with reduced communicative abilities.

Between-subject correlation of heart rate variability predicts movie preferences

We introduce a novel and simple method for assessing audiences’ emotional responses to audiovisuals (e.g. films). Viewers (N = 21) watched movies and TV commercials from different genres while wearing photoplethysmography (PPG) optic sensors on their wrists. Heart rate variability (HRV) synchrony was observed among the audience. Based on this between-subject synchrony measure, we identified emotionally arousing segments from the materials. New participants (N = 24; N = 16) were then invited to watch these identified segments along with some randomly selected segments as control; they reported that the former was more engaging (effect size w = .67; w = .5). This finding was confirmed in an online study with a larger cohort (N = 300). While some specific effects varied depending on movie genre or gender, HRV-based editing generally performed better than the control. These findings suggest that HRV synchrony can be used as a new tool for audience psychology, and potentially also for automatically creating short trailers out of movies in a principled manner while taking into account the human perspective.

Between-subject correlation of heart rate variability predicts movie preferences

We introduce a novel and simple method for assessing audiences’ emotional responses to audiovisuals (e.g. films). Viewers watched movies and TV commercials from different genres while wearing PPG (photoplethysmography) optic sensors on their wrists. Heart rate variability (HRV) synchrony was observed among the audience. Based on this between-subject synchrony measure, we identified emotionally arousing segments from the materials. New participants were then invited to watch these identified segments along with some randomly selected segments as control; they reported that the former was more engaging. This finding was confirmed in an online study with a larger cohort. While some specific effects varied depending on movie genre or gender, HRV-based editing generally performed better than the control. These findings suggest that HRV synchrony can be used as a new tool for audience psychology, and potentially also for automatically creating short trailers out of movies in a principled manner while taking into account the human perspective.

Utility of Vocal Synchrony Measure as an Indicator of Coregulation in Adult Attachment

We aimed to explore the concept of coregulation in adulthood based on the analyses of vocal cues in conversations. Moderators which potentially affect vocal coordination between romantic partners were also examined. Twenty- four heterosexual dating couples (Mage = 21.25; SD = 1.03) from Cornell University were recruited for the Study. Participants communicated with their romantic and stranger partner in a balanced order. Their conversations were recorded and vocal features were extracted. Granger-causality analyses yielded that close partner conversations were bidirectional, signifying that female participants’ previous F0 responses caused male participants’ subsequent F0 responses and vice versa. In the stranger partner conversations, however, only female participants’ previous F0 responses caused male participants’ subsequent F0 responses, implying that there was unidirectional association between stranger partners. In sum, findings suggested that coregulation process can be observed at the vocal level using synchronous speech patterns. Implications for attachment-in-the-making between romantic partners and the literature on behavioral mimicry were discussed.

Measures for concordance and discordance with applications in disease control and prevention

Bivariate binary response data appear in many applications. Interest goes most often to a parameterization of the joint probabilities in terms of the marginal success probabilities in combination with a measure for association, most often being the odds ratio. Using, for example, the bivariate Dale model, these parameters can be modelled as function of covariates. But the odds ratio and other measures for association are not always measuring the (joint) characteristic of interest. Agreement, concordance, and synchrony are in general facets of the joint distribution distinct from association, and the odds ratio as in the bivariate Dale model can be replaced by such an alternative measure. Here, we focus on the so-called conditional synchrony measure. But, as indicated by several authors, such a switch of parameter might lead to a parameterization that does not always lead to a permissible joint bivariate distribution. In this contribution, we propose a new parameterization in which the marginal success probabilities are replaced by other conditional probabilities as well. The new parameters, one homogeneity parameter and two synchrony/discordance parameters, guarantee that the joint distribution is always permissible. Moreover, having a very natural interpretation, they are of interest on their own. The applicability and interpretation of the new parameterization is shown for three interesting settings: quantifying HIV serodiscordance among couples in Mozambique, concordance in the infection status of two related viruses, and the diagnostic performance of an index test in the field of major depression disorders.