Why do we leak lubricant from the eyes to solicit comfort from others? Why do we bare our teeth and crinkle our faces to express non-aggression? The defensive mimic theory proposes that a broad range of human emotional expressions evolved originally as exaggerated, temporally extended mimics of the fast, defensive reflexes that normally protect the body surface. Defensive reflexes are so important to survival that they cannot be safely suppressed; yet they also broadcast information about an animal's internal state, information that can potentially be exploited by other animals. Once others can observe and exploit an animal's defensive reflexes, it may be advantageous to the animal to run interference by creating mimic defensive actions, thereby manipulating the behaviour of others. Through this interaction over millions of years, many human emotional expressions may have evolved. Here, human social signals including smiling, laughing and crying, are compared component-by-component with the known, well-studied features of primate defensive reflexes. It is suggested that the defensive mimic theory can adequately account for the physical form of not all, but a large range of, human emotional expression.

Infant colic is a condition of unknown cause which can result in carer distress and attachment difficulties. Recent studies have implicated the gut microbiota in infant colic, and certain probiotics have demonstrated possible efficacy. We aim to investigate whether the intestinal microbiota composition in infants with colic is associated with cry/fuss time at baseline, persistence of cry/fuss at 4-week follow-up, or child behavior at 2 years of age. Fecal samples from infants with colic (n = 118, 53% male) were analyzed using 16S rRNA sequencing. After examining the alpha and beta diversity of the clinical samples, we performed a differential abundance analysis of the 16S data to look for taxa that associate with baseline and future behavior, while adjusting for potential confounding variables. In addition, we used random forest classifiers to evaluate how well baseline gut microbiota can predict future crying time. Alpha diversity of the fecal microbiota was strongly influenced by birth mode, feed type, and child gender, but did not significantly associate with crying or behavioral outcomes. Several taxa within the microbiota (including Bifidobacterium, Clostridium, Lactobacillus, and Klebsiella) associate with colic severity, and the baseline microbiota composition can predict further crying at 4 weeks with up to 65% accuracy. The combination of machine learning findings with associative relationships demonstrates the potential prognostic utility of the infant fecal microbiota in predicting subsequent infant crying problems.

This study investigated how adults respond to a moral transgression committed by a child offender, by examining the role of the child’s sex, emotions, and crying behavior when caught committing a moral transgression on adults’ forgiveness, trust, and disciplinary behaviors. An experimental survey manipulated the children’s sex, crying, and their emotional expressions (fear, sadness, shame, and crying). Participants (N = 847) reported how they would feel, their willingness to forgive (immediately and a week after the event) and to trust the child, estimated recidivism, and the use of disciplinary behaviors. Results showed that participants in the crying conditions reported significantly higher levels of intention to trust and forgive the child a week after the event, and a lower estimation of the child committing a similar act in the future than participants in the non-crying conditions (ps < .05). Compared to men, women anticipated higher intentions to forgive (ps < .05), and more inductive behaviors, less overreactivity and warmth removal towards the child (ps < .001). Overall, the results suggest the functional value of crying in children-adults relations and the importance of the gender of both child and adults in a context of a moral transgression committed by a child.

Pseudobulbar affect, thought by many to be a relatively newly described condition, is in fact a very old one, described as early as the 19th century. It refers to those who experience inappropriate affect, disconnected from internal state, or mood, generally thought to be the result of an upper motor neuron injury or illness. One possible explanation for this condition’s relative obscurity is the dearth of treatment options; clinical medicine is not typically in the habit of identifying conditions that cannot be modified. Now, however, there is good evidence for the treatment of pseudobulbar affect, and even a therapy approved for use by the U.S. Food and Drug Administration (FDA). As a result, appropriate identification and subsequent management of pseudobulbar affect is more important than ever. This article purports to summarize the origins of pseudobulbar affect, most current hypotheses as to its physiopathology, clinical identification, and evidence for management.

Frontal and basal ganglia infarcts and executive dysfunction are thought to be involved in the pathophysiology of poststroke emotional incontinence (PSEI). The study examined whether patients with PSEI have more frontal and/or basal ganglia infarcts and impairment in executive function. A total of 516 Chinese patients with acute ischemic stroke consecutively admitted to the acute stroke unit of a university-affiliated regional hospital in Hong Kong were screened for PSEI 3 months after the index stroke. According to Kim’s criteria, 39 (7.6%) had PSEI. Thirty-nine stroke patients without PSEI served as matched control group. The PSEI group had significantly more frontal and/or basal ganglia infarcts, had lower Chinese Frontal Assessment Battery scores, required more time to complete the Stroop Test, and made more omission and commission errors in the Go–NoGo test. There was no significant correlation between frontal or basal ganglia infarcts and executive function. The correlation between frontal infarct and severity of PSEI was .420. Further follow-up and functional imaging studies are warranted to explore the relationship between PSEI, brain infarcts, and executive dysfunction. (JINS, 2009, 15, 62–68.)

Objective: Crying is a common but seldom studied phenomenon in palliative care. The aim of this study was to explore the significance of patients crying in a palliative care context.

Methods: Tape-recorded interviews with 14 cancer patients in palliative home care were carried out. To gain deeper understanding, a hermeneutic analysis and interpretation was used.

Results: Crying was described in different dimensions: (1) intense and despondent crying as a way of ventilating urgent needs, (2) gentle, sorrowful crying as a conscious release of emotions, and (3) quiet, tearless crying as a protection strategy. Crying seems to be an expression for an inner emotional force, provoked by different factors, which cause changes in the present balance. To cry openly but also to cry on the inside meant being able to achieve or maintain balance. Crying may be something useful, which could create release and help reduce tension, but it may also have a negative impact as it consumes energy and creates feelings of shame.

Significance of results: Professionals need to understand the different levels of crying. In such situations sometimes comforting the patient may not be the best solution, as some may need privacy.

Objectives: Following disruption from students, particularly boys, during the administration of item 10, the ‘feel like crying’ question, of the Children's Depression Inventory (CDI), this study sought to explore the issue of non-response to this question. It was decided that particular attention should be given to gender differences in responses and non-responses, based on the experiences of researchers administering this measure.

Method: Chi-square analysis of non-responses was conducted on CDI items collected from a total sample of 2,297 second year and pre-leaving certificate students from 23 randomly selected schools in the Mid-West region of Ireland.

Results: Analysis identified item 10 as being significantly less likely to be completed than any other item. Further analysis revealed that boys were significantly less likely to respond to this question than girls.

Conclusion: A modification of the wording to item 10 is suggested to ameliorate this difficulty.

In this article I evaluate recent attempts to illuminate the human infant cry from an evolutionary perspective. Infants are born into an uncertain parenting environment, which can range from indulgent care of offspring to infanticide. Infant cries are in large part adaptations that maintain proximity to and elicit care from caregivers. Although there is not strong evidence for acoustically distinct cry types, infant cries may function as a graded signal. During pain-induced autonomic nervous system arousal, for example, neural input to the vocal cords increases cry pitch. Caregivers may use this acoustic information, together with other cues, to guide caregiving behavior. Serious pathology, on the other hand, results in chronically and severely abnormal cry acoustics. Such abnormal crying may be a proximate cause of adaptive infant maltreatment, in circumstances in which parents cut their losses and reduce or withdraw investment from infants with low survival chances. An increase in the amount of crying during the first few months of life is a human universal, and excessive crying, or colic, represents the upper end of this normal increase. Potential signal functions of excessive crying include manipulation of parents to acquire additional resources, honest signaling of need, and honest signaling of vigor. Current evidence does not strongly support any one of these hypotheses, but the evidence is most consistent with the hypothesis that excessive early infant crying is a signal of vigor that evolved to reduce the risk of a reduction or withdrawal of parental care.