The human stress response has been characterized, both physiologically and behaviorally, as "fight-or-flight." Although fight-or-flight may characterize the primary physiological responses to stress for both males and females, we propose that, behaviorally, females' responses are more marked by a pattern of "tend-and-befriend." Tending involves nurturant activities designed to protect the self and offspring that promote safety and reduce distress; befriending is the creation and maintenance of social networks that may aid in this process. The biobehavioral mechanism that underlies the tend-and-befriend pattern appears to draw on the attachment-caregiving system, and neuroendocrine evidence from animal and human studies suggests that oxytocin, in conjunction with female reproductive hormones and endogenous opioid peptide mechanisms, may be at its core. This previously unexplored stress regulatory system has manifold implications for the study of stress.

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Biobehavioral responses to stress in females: tend-and-befriend, not fight-or-flight.

The author explores the viability of a comparative approach to personality research. A review of the diverse animal-personality literature suggests that (a) most research uses trait constructs, focuses on variation within (vs. across) species, and uses either behavioral codings or trait ratings; (b) ratings are generally reliable and show some validity (7 parameters that could influence reliability and 4 challenges to validation are discussed); and (c) some dimensions emerge across species, but summaries are hindered by a lack of standard descriptors. Arguments for and against cross-species comparisons are discussed, and research guidelines are suggested. Finally, a research agenda guided by evolutionary and ecological principles is proposed. It is concluded that animal studies provide unique opportunities to examine biological, genetic, and environmental bases of personality and to study personality change, personality-health links, and personality perception.

From mice to men: what can we learn about personality from animal research?

Eighteen animal, models of depression are reviewed in relation to three sets of validating criteria. Of the 18 models, five could only be assessed for predictive, validity, seven could be assessed for predictive and face validity, and six could potentially have predictive, face and construct validity. Some traditional models (reserpine reversal, amphetamine potentiation) are rejected as invalid; the models with the highest overall validity are the intracranial self-stimulation, chronic stress and learned helplessness models in rats, and the primate separation model.

The validity of animal models of depression.

OBJECTIVE: Clinical reports suggest that many adults who engage in self-destructive behavior have childhood histories of trauma and disrupted parental care. This study explored the relations between childhood trauma, disrupted attachment, and self-destruction, using both historical and prospective data. METHOD: Seventy-four subjects with personality disorders or bipolar II disorder were followed for an average of 4 years and monitored for self-destructive behavior such as suicide attempts, self-injury, and eating disorders. These behaviors were then correlated with independently obtained self-reports of childhood trauma, disruptions of parental care, and dissociative phenomena. RESULTS: Histories of childhood sexual and physical abuse were highly significant predictors of self-cutting and suicide attempts. During follow-up, the subjects with the most severe histories of separation and neglect and those with past sexual abuse continued being self-destructive. The nature of the trauma and the subjects' age at the time of the trauma affected the character and the severity of the self-destructive behavior. Cutting was also specifically related to dissociation. CONCLUSIONS: Childhood trauma contributes to the initiation of self-destructive behavior, but lack of secure attachments helps maintain it. Patients who repetitively attempt suicide or engage in chronic self-cutting are prone to react to current stresses as a return of childhood trauma, neglect, and abandonment. Experiences related to interpersonal safety, anger, and emotional needs may precipitate dissociative episodes and self-destructive behavior. Language: en

Childhood origins of self-destructive behavior.

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Parental care in mammals

SUMMARY

The influence of 10 days of maternal separation on behavior and physiology was studied in 8 social group living pigtailed macaque (M. nemestrina)monkey infants. Maternal separation was accompanied by behavioral changes' included slowing of movement, decreases in play, increases in oral behaviors, and assumption of a characteristic slouched posture and sad facial expression. Physiological changes included decreases in heart rate and body temperature, sleep disturbances that were most pronounced in the Awake and REM sleep systems, and changes in EEG alpha power-spectra. Individual variability in the behavioral and physiological response to maternal separation was marked, and showed only a minimal correlation with measures of early behavioral development and the early mother-infant interaction. Some physiological changes appeared to lie relatively long lasting. The data demonstrate that the disruption of an attachment bond may be accompanied by pronounced physiological changes suggestive of d general impairment of autonomic homeostatic regulatory processes. The findings have important implications for our understanding of the Pathophysiology of grief, and the physiological concomitants of. separation, loss, and depression in children.

Attachment, loss, and depression*

Heart rate and body temperature in separated monkey infants.

• Nocturnal sleep was recorded from ten unrestrained, groupliving Macaca nemestrina (pigtail) monkey infants, using implantable multichannel biotelemetry systems, during the agitation-depression behavioral reaction that follows maternal separation. Sleep disturbances during the four nights of separation were characterized by decreases in rapid eye movement (REM) time and in the number of REM periods, and increases in REM latency. Time awake and number of arousals were increased. Slow-wave sleep was not significantly affected. Sleep pattern changes were most pronounced the first separation night, and tended to decrease as separation continued, whereas behavioral measures of depression tended to increase as separation continued (up to four days). Sleep patterns returned to normal following reunion with the mother. Those infants who had the most severe sleep disturbances the first separation night (more time awake, less total sleep, less REM) also tended to become most depressed behaviorally later in the separation period.

Nocturnal sleep in separated monkey infants.

Three pigtail infant monkeys (Macaca nemestrina) were separated from their mothers shortly after birth and raised in social isolation on cloth surrogates. At about 24 weeks of age they were surgically implanted with multichannel biotelemetry systems. Following the collection of baseline behavioral and physiological data, the cloth surrogates were removed for 4 days, then returned. The behavioral and physiological (heart rate, body temperature, sleep patterns) reaction to separation from the surrogate was much less intense than is the case in group-living pigtail infants that are separated from their mothers, suggesting that the attachment bond to a cloth surrogate may well be different than the bond to a living mother in a social group. Heart rate mean values and variability were similar in surrogate-reared and mother-reared infants, suggesting a degree of environmental independence in heart rate regulation.

Robert Short

Papers

Attachment, loss, and depression*

Heart rate and body temperature in separated monkey infants.

Nocturnal sleep in separated monkey infants.

Physiological correlates of maternal separation in surrogate‐reared infants: A study in altered attachment bonds

Loss of Your Mother Is More than Loss of a Mother