Motion and emotion: depression reduces psychomotor performance and alters affective movements in caregiving interactions.
BACKGROUND
Impaired social functioning is a well-established feature of depression. Evidence to date suggests that disrupted processing of emotional cues may constitute part of this impairment. Beyond processing of emotional cues, fluent social interactions require that people physically move in synchronized, contingent ways. Disruptions to physical movements are a diagnostic feature of depression (psychomotor disturbance) but have not previously been assessed in the context of social functioning. Here we investigated the impact of psychomotor disturbance in depression on physical responsive behavior in both an experimental and observational setting.


METHODS
In Experiment 1, we examined motor disturbance in depression in response to salient emotional sounds, using a laboratory-based effortful motor task. In Experiment 2, we explored whether psychomotor disturbance was apparent in real-life social interactions. Using mother-infant interactions as a model affective social situation, we compared physical behaviors of mothers with and without postnatal depression (PND).


RESULTS
We found impairments in precise, controlled psychomotor performance in adults with depression relative to healthy adults (Experiment 1). Despite this disruption, all adults showed enhanced performance following exposure to highly salient emotional cues (infant cries). Examining real-life interactions, we found differences in physical movements, namely reduced affective touching, in mothers with PND responding to their infants, compared to healthy mothers (Experiment 2).


CONCLUSIONS
Together, these findings suggest that psychomotor disturbance may be an important feature of depression that can impair social functioning. Future work investigating whether improvements in physical movement in depression could have a positive impact on social interactions would be of much interest.
Department of Psychiatry, Warneford Hospital Oxford, UK ; MindLab/Center of Functionally Integrative Neuroscience (CFIN), Aarhus University Aarhus, Denmark ; Department of Psychology, University of California, Los Angeles (UCLA) Los Angeles, USA.
Katherine S
KS
Young
Department of Psychiatry, Warneford Hospital Oxford, UK ; MindLab/Center of Functionally Integrative Neuroscience (CFIN), Aarhus University Aarhus, Denmark.
Christine E
CE
Parsons
Department of Psychiatry, Warneford Hospital Oxford, UK.
Alan
A
Stein
Department of Psychiatry, Warneford Hospital Oxford, UK ; MindLab/Center of Functionally Integrative Neuroscience (CFIN), Aarhus University Aarhus, Denmark.
Morten L
ML
Kringelbach
depression; emotion; infant crying; psychomotor performance; social interaction