Effects of d-amphetamine on self-aggression and posturing in stumptail macaques

The behavioral effects of d-amphetamine sulfate were studied in adult male stumptail macaques living within a large heterogeneous group in an outdoor enclosure. Among five subjects that received a range of doses (.01 to .3 mg/kg), d-amphetamine increased self-aggressive behavior and abnormal posturing in subjects that exhibited these types of behavior prior to drug administration, but it had no effect in subjects not exhibiting those activities in the absence of the drug. For the former subjects, the dose-effect curves for self-aggression were of an inverted U-shape analogous to the effect of d-amphetamine on schedule-controlled behavior. Over the range of doses studied, the curve for abnormal posturing was monotonic. The data indicate that d-amphetamine can have effects on untrained behavior in individual animals in a quasinatural environment that are qualitatively and quantitatively similar to the behavioral effects observed in other laboratory environments, and that d-amphetamine does not evoke or increase a behavioral response in individual subjects that do not exhibit the response in the absence of the drug.     

Putting the cart before the horse: claims for mirror self-recognition in horses are unfounded

Animal Cognition - The recent article by Baragli, Scopa, Maglieri, and Palagi (Anim Cogn https://doi.org/10.1007/s10071-021-01502-7 , 2021) that claims to demonstrate mirror self-recognition (MSR)...     

Getting rid of blinkers: the case of mirror self-recognition in horses (Equus caballus)

Animal Cognition - The commentary by Gallup and Anderson (Anim Cogn https://doi.org/10.1007/s10071-021-01538-9 , 2021) on the original article by Baragli, Scopa, Maglieri, and Palagi (Anim Cogn...     

Anodal transcranial direct current stimulation of right temporoparietal area inhibits self-recognition

Self–other discrimination is a crucial mechanism for social cognition. Neuroimaging and neurostimulation research has pointed to the involvement of the right temporoparietal region in a variety of self–other discrimination tasks. Although repetitive transcranial magnetic stimulation over the right temporoparietal area has been shown to disrupt self–other discrimination in face-recognition tasks, no research has investigated the effect of increasing the cortical excitability in this region on self–other face discrimination. Here we used transcranial direct current stimulation (tDCS) to investigate changes in self–other discrimination with a video-morphing task in which the participant’s face morphed into, or out of, a familiar other’s face. The task was performed before and after 20 min of tDCS targeting the right temporoparietal area (anodal, cathodal, or sham stimulation). Differences in task performance following stimulation were taken to indicate a change in self–other discrimination. Following anodal stimulation only, we observed a significant increase in the amount of self-face needed to distinguish between self and other. The findings are discussed in relation to the control of self and other representations and to domain-general theories of social cognition.     

Responses to mirror-image stimulation in jungle crows (Corvus macrorhynchos)

Four jungle crows (Corvus macrorhynchos) were exposed to a mirror placed either vertically or horizontally. The most frequently observed behaviors were pecking at the mirror and wing flapping when looking toward the mirror. These behavior patterns, which were only rarely observed when the mirror was reversed, can be interpreted as aggressive behaviors against a conspecific. The vertical mirror evoked the behaviors more often than the horizontal mirror. The present results suggest that crows perceive their mirror image as an image of a conspecific, not as their own. Received: 16 December 1999 / Accepted after revision 29 January 2000     

Sense of body and sense of action both contribute to self-recognition

Recognizing oneself, easy as it appears to be, seems at least to require awareness of one's body and one's actions. To investigate the contribution of these factors to self-recognition, we presented normal subjects with an image of both their own and the experimenter's hand. The hands could make the same, a different or no movement and could be displayed in various orientations. Subjects had to tell whether the indicated hand was theirs or not. The results showed that a congruence between visual signals and signals indicating the position of the body is one component on which self-recognition is based. Recognition of one's actions is another component. Subjects had most difficulty in recognizing their hand when movements were absent. When the two hands made different movements, subjects relied exclusively on the movement cue and recognition was almost perfect. Our findings are in line with pathological alterations in the sense of body and the sense of action.     

The relationship perceived between the real body and the mirror image

We analyse here people's perception of their reflections in mirrors placed in different positions. In two experiments, participants looked at their mirror image, in a third experiment they looked at another person's image. In both cases they were asked to answer a series of questions about how the virtual body appeared relative to the real body, focusing on different aspects. In experiment 1, they were asked to decide whether the reflections were identical, similar, different, or opposite in terms of the global relationship, orientation, and lateralisation (left right arm). In experiment 2 they were instructed to make simple gestures and to evaluate if the gestures in the reflection were identical, opposite, similar, or different from theirs. Results show that 'identity' was preferred when the mirror was in front, and 'opposition' was preferred when the mirror was below. When opposition was experienced, it was attributed mainly to the exocentric frame of reference. Egocentric left-right reversal was not a common experience, although it was reported more frequently when the mirror was in front. The different roles of the exocentric and egocentric frames of reference were further tested in experiment 3, in which the condition of an observer looking at another person's reflection was studied. Contrary to the emphasis on the egocentric frame of reference in the literature on the 'mirror question', results presented in this paper demonstrate the importance of the exocentric frame of reference in influencing how observers react to their reflections.     

Responses of the human motor system to observing actions across species: A transcranial magnetic stimulation study

Ample evidence suggests that the role of the mirror neuron system (MNS) in monkeys is to represent the meaning of actions. The MNS becomes active in monkeys during execution, observation, and auditory experience of meaningful, object-oriented actions, suggesting that these cells represent the same action based on a variety of cues. The present study sought to determine whether the human motor system, part of the putative human MNS, similarly represents and reflects the meaning of actions rather than simply the mechanics of the actions. To this end, transcranial magnetic stimulation (TMS) of primary motor cortex was used to generate motor-evoked potentials (MEPs) from muscles involved in grasping while participants viewed object-oriented grasping actions performed by either a human, an elephant, a rat, or a body-less robotic arm. The analysis of MEP amplitudes suggested that activity in primary motor cortex during action observation was greatest during observation of the grasping actions of the rat and elephant, and smallest for the human and robotic arm. Based on these data, we conclude that the human action observation system can represent actions executed by non-human animals and shows sensitivity to species-specific differences in action mechanics.     

Cues for self-recognition in point-light displays of actions performed in synchrony with music

Self–other discrimination was investigated with point-light displays in which actions were presented with or without additional auditory information. Participants first executed different actions (dancing, walking and clapping) in time with music. In two subsequent experiments, they watched point-light displays of their own or another participant’s recorded actions, and were asked to identify the agent (self vs. other). Manipulations were applied to the visual information (actions differing in complexity, and degradation from 15 to 2 point-lights within the same clapping action) and to the auditory information (self-generated vs. externally-generated vs. none). Results indicate that self-recognition was better than chance in all conditions and was highest when observing relatively unconstrained patterns of movement. Auditory information did not increase accuracy even with the most ambiguous visual displays, suggesting that judgments of agent identity depend much more on motor cues than on auditory (action-generated) or audiovisual (synchronization) information.     

Visual self-recognition in mirrors and live videos: Evidence for a developmental asynchrony

Three experiments (N = 123) investigated the development of live-video self-recognition using the traditional mark test. In Experiment 1, 24-, 30- and 36-month-old children saw a live video image of equal size and orientation as a control group saw in a mirror. The video version of the test was more difficult than the mirror version with only the oldest children's performance approaching ceiling. In Experiment 2, most 24-month-olds showed self-recognition when presented with a TV-set that featured a mirror in place of a screen. This finding does not substantiate the possibility that expectations about what appears on TV are responsible for the asynchrony. In Experiment 3, children were given a mark-test involving only their legs. Again, a video version was more difficult than previously reported performance with mirrors, suggesting that the impossibility of eye-contact in video cannot explain this developmental asynchrony. The findings suggest that self-recognition can be added to the growing list of contexts in which 2-year-olds display what has been called a “video deficit” [Anderson, D. R., & Pempek, T. A. (2005). Television and very young children. American Behavioral Scientist, 48, 505–532].     

Video-task assessment of learning and memory in macaques (Macaca mulatta): effects of stimulus movement on performance

Effects of stimulus movement on learning, transfer, matching, and short-term memory performance were assessed with 2 monkeys using a video-task paradigm in which the animals responded to computer-generated images by manipulating a joystick. Performance on tests of learning set, transfer index, matching to sample, and delayed matching to sample in the video-task paradigm was comparable to that obtained in previous investigations using the Wisconsin General Testing Apparatus. Additionally, learning, transfer, and matching were reliably and significantly better when the stimuli or discriminanda moved than when the stimuli were stationary. External manipulations such as stimulus movement may increase attention to the demands of a task, which in turn should increase the efficiency of learning. These findings have implications for the investigation of learning in other populations, as well as for the application of the video-task paradigm to comparative study.     

Acquisition of prerequisites to conservation by macaques.

Through a progressive series of learning sets, two rhesus macaques were trained to discriminate transformations that produce change of substance from other transformations and manipulations. Several tests were administered to assess the generalization of this discrimination to a variety of objects and shapes and to assess the effects, if any, of size cues, experimenter familiarity, and various methods to problem presentation. After training was completed, performance was not greatly affected by differences in problems and presentations. The results of these experiments suggest that monkeys can acquire this prerequisite for substance conservation as a result of learning set training.     

Symmetry perception in humans and macaques

The human ability to detect symmetry has been a topic of interest to psychologists and philosophers since the 19th century, yet surprisingly little is known about the neural basis of symmetry perception. In a recent fMRI study, Sasaki and colleagues begin to remedy this situation. By identifying the neural structures that respond to symmetry in both humans and macaques, the authors lay the groundwork for understanding the neural mechanisms underlying symmetry perception.     

Political Responses to Dissatisfaction in Russia

This paper seeks to determine how Russian citizens deal politically with the widespread discontent in the Russian Federation. Citizens are not only dissatisfied with their personal life, their job, and their financial situation but their dissatisfaction is also extremely high with government performance on several public problems. To analyze the responses to this deteriorating situation in the Russian Federation, a modified theory of Hirschman (1970) is used.The problems that beset citizens in their daily lives are not translated in political activity. In order to cope with self-located problems on housing, job and financial conditions, private rather than political means are activated. However, when we look at socially located problems, that are objects of government policy – e.g., employment, rising prices, crime rise – the readiness to voice concerns on these issues through political activities is rather small; citizens that are ready to voice prefer to do this by means of voting.Citizens that do not consider the voice alternative as a reaction to their dissatisfaction, cannot be equated to loyal citizens. Silent non-voice lumps together two phenomena. One form of silence may be loyalty, the other form of silence can be covered by the concept of neglect. Political neglect – in the literature sometimes under the label of political alienation or political apathy – is a serious alternative, that deserves a place next to Hirschman's options of active opposition (voice) and diffuse positive support (loyalty). Empirically, the phenomenon of neglect appears to be a widespread response to political dissatisfaction in the Russian Federation.The voice and loyalty response – although treated as alternatives in Hirschman's theory – are different sort of variables. Loyalty is an attitude, whereas voice is an action. Both are related. Loyalty can activate voice, whereas neglect can hamper the operation of voice. Although neglect and loyalty can be treated as mutually exclusive attitudes, voice can manifest itself in combination with both feelings. Voice can thus manifest as a loyal voice and a cynic voice. It is shown in the analysis that if people are ready to voice in Russia it is a voice of the latter kind, with little hope on future improvement.     

Cognitive and Behavioral Responses to Trauma

In order to identify cognitive and behavioral responses to trauma, we have studied responses to mass casualty body handling following the Gander, Newfoundland, plane crash of 1985 and the 1989 USS Iowa disaster, and responses to a simulated chemical and biological warfare environment. Individual and group trauma behaviors show prominent: (a) thinking by similarity (identification, and looking for the familiar/ seeing the past in the present); (b) attribution of meaning (rituals, symbols, language, and rumors); and (c) contagion of behavior. These processes highlight the importance of the study of responses to different traumatic stressors in order to identify cognitive mechanisms and behaviors activated by trauma. Such phenomena may be important to our understanding of the effects of traumatic stress and their acute and long-term health outcomes.