Sympathetic Activation in Response to Infant Cry: Distress or Promptness to Action?

SYNOPSIS An increase in sympathetic nervous system (SNS) activity or reactivity in response to stimulation is usually interpreted as an index of heightened maladaptive distress. However, sympathetic activation also underlies promptness to action, so it is not clear whether the same relation could stand for parental responses to infant cry given that a ready and prompt parental response to infant cry favors more adaptive cognitive, social, and emotional development in the infant. Previous studies have not been consistent in the interpretation of sympathetic activation which occurs in response to infant cry. We discuss these two opposing proposed interpretations. A possible alternative interpretation may be that medium activation of the SNS is adaptive because it prepares the organism to act promptly, whereas too low or too high SNS activation is maladaptive because it underlies a lack of empathetic reaction or a highly distressed response.