Attack and defense in conspecific fighting in tree shrews (Tupaia belangeri)

Principles of conspecific defense have been analyzed for rodents, in which specific target sites for biting by attackers on defenders serve as an important determinant of the actions involved in both attacker and defender behavior. In an effort to determine the generality of these principles, attack and defensive behaviors and target sites for biting attack were evaluated in a nonrodent species, the tree shrew (Tupaia belangeri). Brief daily and repeated conspecific dyadic encounters between adult, socially experienced males (dominants, attackers), and adult, socially naive males (subordinates, defenders) that had been transferred into the territory of the dominants, produced a polarization of attack and defense. The dominant males showed chase, chase attack, jump attack, and biting behaviors, while the subordinates displayed flight and freezing. The vast majority of bites, as well as wounds and bruises, were on the subordinates’ backs. These patterns are very similar to those previously found in rats and mice and suggest that the organization of fighting, with targets of biting (or other painful) attack serving as an important determinant of both attacker (dominant) and defender (subordinate) behavior, may show considerable generality across nonrodent as well as rodent species. Although relatively few wounds were found after 28 days of repeated and daily encounters, the subordinate tree shrews show a variety of behavioral, neuroendocrine, and central nervous changes, indicating that they are stressed by these encounters per se. Aggr. Behav. 27:139–148, 2001. © 2001 Wiley‐Liss, Inc.     

Behaviors of Swiss-Webster and C57/BL/6N sin mice in a fear/defense test battery

When confronted by an approaching threat stimulus (experimenter or laboratory rat), Swiss-Webster mice show initial flight, followed by freezing and defensive vocalization and biting, the latter only when escape is blocked. These defense patterns resemble those of the wild rat, suggesting that mice of this strain do not show the reductions in flight and defensive threat/attack that are typical of laboratory rats. C57/BL/6N Sin strain mice showed fewer avoidances to an approaching predator, as well as reduced vocalization and defensive biting, a pattern more similar to that of laboratory rats. As with rats, female mice appeared to be more defensive to a predator. They showed greater reactivity to dorsal contact and more frequent defensive biting and jump attacks than males of the same strains. These patterns of defensive behaviors suggest that, although strain differences in defense are substantial, laboratory mice are suitable for, and may offer several advantages in, the study of the genetic, endocrine, and pharmacological basis of antipredator defense. © 1995 Wiley-Liss, Inc.     

Effects of novel odors on intermale attack behavior in mice

Offensive, defensive, and nonagonistic social behaviors of resident male mice toward unfamiliar intruders were examined during exposure to the novel odors of chocolate or sheep's wool. Both novel odors reduced lateral attacks and boxing when compared to familiar sawdust odor. Chocolate, but not sheep's wool, also reliably increased flight behavior by residents. Neither social behaviors nor self-grooming were affected by these odors. The novel odors had no effect upon, or actually decreased, the defensive responses of intruders towards residents. The equivalent effectiveness of both predator and nonpredator odors in elevating risk assessment and suppressing attack during firsttime exposure, and the decreased potency of cat odors following repeated exposure, suggests that novelty contributes to the enhanced defensiveness seen among subjects during initial exposure to predator odors. © 1995 Wiley-Liss, Inc.     

Thinking in the space between Winnicott and Lacan

The author, following André Green, maintains that the two most original psychoanalytic thinkers since Freud were Donald Winnicott and Jacques Lacan. Winnicott, it has been said, introduced the comic tradition into psychoanalysis, while Lacan sustained Freud's tragic/ironic vision. Years of mutual avoidance by their followers (especially of Lacan by Anglophone clinicians) has arguably diminished understanding of the full spectrum of psychoanalytic thought. The author outlines some basic constructs of Winnicott and of Lacan, including: their organizing tropes of selfhood versus subjectivity, their views of the "mirror stage", and their definitions of the aims of treatment. While the ideas of Winnicott and Lacan appear at some points complementary, the goal is not to integrate them into one master discourse, but rather to bring their radically different paradigms into provocative contact. A clinical vignette is offered to demonstrate concepts from Lacan and Winnicott, illustrating what it might mean to think and teach in the potential space between them.     

Elephant psychology: What we know and what we would like to know

Although elephants are well-known and one of the most popular species among people, their behavior and cognitive abilities have not been studied very extensively. But recently, more and more researchers are becoming interested in studying their cognition, particularly their general intelligence, including causal reasoning and mirror self recognition, memory, and numerical cognition. Although genetically elephants are more closely related to the small-brained aardvarks and manatees than to primates, they hold enormous potential in their cognitive skills. Also, studying their cognition is important from the point of view of animal welfare in captivity.     

Self,other and individuation: resolving narcissism through the lunar and solar paths of the Rosarium

This paper describes narcissism as our natural, infant-like behaviour, and specifies three characteristics relating to the evacuation and avoidance of distress, to control, and to distancing from relationship. It suggests that the processes of incarnation and individuation represent the development of the early ego and the ‘resolution’ of these narcissistic ways of being, including escape from the ‘mirror trap’. The development of the early, controlling ‘homunculus-ego’ entails the loosening and broadening of ego-identifications and the ego becoming subject to the Self. This is an embodied-relational-social-spiritual process outlined in detail by the full 20 woodcuts of the Rosarium Philosophorum, and specifically the lunar (relational) and solar (self-expressive) paths, which are explored herein. These processes are illustrated with respect to the interaction between infant and caregiver, clinical vignettes and examples from the political sphere.     

Payoff expectancies between contingent serial moves of victim and aggressor in three hypothetical conflict situations

The expectancies of payoffs in the contingent serial interactive moves between victim and instigator, from the point of view of the victim, were measured for three hypothetical confrontations: someone pushes ahead of you in a movie line; a driver of a car takes a parking space you felt was yours; or you are the object of a rape attempt. These situations differ in urgency, and in the likelihood of success if there is resistance to the instigator. Expectations of persons were elicited as to their response to the particular aggressive act, the counter-response then expected of the instigator of the attack, and the subsequent contingent responses of each of the two persons, victim and instigator, until one or the other withdrew. The results show, in general, different payoffs at each interactive point over the ongoing serial stages in a situation, rather than an overall generalized contingency expectation, with these being different for self and the symbolized other, and also different for the three situations. Personality and sex-role measures showed minimal relation to the expectancies, and then not at the opening of the conflict, and for the instigator's rather than for the victim's expected responses.     

Relationship between attack and feeding in the insect predatory behavior of grasshopper mice

In grasshopper mice, the consequences of feeding and state of hunger affect the predatory attack to a limited extent. The purpose of this study was: (1) to establish other ways that attack and feeding were connected besides the two effects already mentioned; and (2) to determine if caching of dead prey could account for the limited connection between attack and feeding. Experiment 1 showed that attack and feeding were connected as part of a reaction chain. Experiment 2 showed that both shared a common maturational process despite the fact that each response achieved an improved efficiency in a different way. Experiment 3 showed that caching prey was not correlated with the killing of a prey and thus could not account for the limited connection between attack and feeding. It is proposed that a highly canalized attack response specifically buffered against the effects of feeding and hunger plays an important role in the mouse's carnivorous life style.     

Habituation of aggressive behavior in mice: A parametric study

The decline of aggression as a result of repeated episodes of fighting may represent a habituation phenomenon. The frequency of biting and sideways threat by male mice toward conspecific intruders declined over ten 5-min confrontations. Aggression returned to about 50% of original levels when a new intruder was introduced. Variations in length or frequency of confrontation indicated that the rate of decline of attack bites and sideways threats depended on these confrontation parameters. The condition that provided the fewest opportunities to fight provided the least decline in the frequency of attack and threat. The frequency of attack bites and sideways threats elicited by the presentation of a new intruder after repeated confrontations was greater than the frequency of attack bite and sideways threat in the last confrontation with the original intruder, when the resident and intruder were relatively inexperienced. Spontaneous recovery of attack and threat occurred but rate of recovery did not depend on confrontation parameters. The results indicate that the decrement of aggression in mice in repeated confrontations may be the result of habituation but fatigue is an important cofactor.     

The persistence of attack satiation in female golden hamsters

Female hamsters were allowed to attack a series of target hamsters until they reached a criterion of attack satiation. Following delays of 0, 24, or 48 hr they were then presented with a novel “probe” target. Attacks on the probe target were reduced to 26% of baseline at 0 delay and had returned to 71% of baseline by 48 hr. The number of attacks necessary to achieve satiation criterion increased then decreased over the three test occasions, suggesting that habituationlike processes may contribute to, but cannot wholly account for, the satiation effect.