Prospective object search in dogs: mixed evidence for knowledge of <Emphasis Type="Italic">What</Emphasis> and <Emphasis Type="Italic">Where</Emphasis>

We investigated whether two dogs that had been specially trained to retrieve objects by their names were able to integrate information about the identity (What) as well as the location (Where) of those objects so that they could plan their search accordingly. In a first study, two sets of objects were placed in two separate rooms and subjects were asked to retrieve the objects, one after the other. Both dogs remembered the identity of the objects as they reliably retrieved the correct objects. One of the dogs was also able to integrate information about the object’s location as he chose the correct location in which the object had been placed. Further investigation of the second dog’s behavior revealed that she followed a more stereotyped search strategy. Despite this variation in performance, this study provides evidence for the memory of What and Where in a domestic dog and shows the prospective use of such information in a search task.     

Domestic dogs (Canis familiaris) use a physical marker to locate hidden food

Dogs can use the placement of an arbitrary marker to locate hidden food in an object-choice situation. We tested domestic dogs (Canis familiaris) in three studies aimed at pinning down the relative contributions of the human’s hand and the marker itself. We baited one of two cups (outside of the dogs’ view) and gave the dog a communicative cue to find the food. Study 1 systematically varied dogs’ perceptual access to the marker placing event, so that dogs saw either the whole human, the hand only, the marker only, or nothing. Follow-up trials investigated the effect of removing the marker before the dog’s choice. Dogs used the marker as a communicative cue even when it had been removed prior to the dog’s choice and attached more importance to this cue than to the hand that placed it although the presence of the hand boosted performance when it appeared together with the marker. Study 2 directly contrasted the importance of the hand and the marker and revealed that the effect of the marker diminished if it had been associated with both cups. In contrast touching both cups with the hand had no effect on performance. Study 3 investigated whether the means of marker placement (intentional or accidental) had an effect on dogs’ choices. Results showed that dogs did not differentiate intentional and accidental placing of the marker. These results suggest that dogs use the marker as a genuine communicative cue quite independently from the experimenter’s actions.     

Handler beliefs affect scent detection dog outcomes

Our aim was to evaluate how human beliefs affect working dog outcomes in an applied environment. We asked whether beliefs of scent detection dog handlers affect team performance and evaluated relative importance of human versus dog influences on handlers’ beliefs. Eighteen drug and/or explosive detection dog/handler teams each completed two sets of four brief search scenarios (conditions). Handlers were falsely told that two conditions contained a paper marking scent location (human influence). Two conditions contained decoy scents (food/toy) to encourage dog interest in a false location (dog influence). Conditions were (1) control; (2) paper marker; (3) decoy scent; and (4) paper marker at decoy scent. No conditions contained drug or explosive scent; any alerting response was incorrect. A repeated measures analysis of variance was used with search condition as the independent variable and number of alerts as the dependent variable. Additional nonparametric tests compared human and dog influence. There were 225 incorrect responses, with no differences in mean responses across conditions. Response patterns differed by condition. There were more correct (no alert responses) searches in conditions without markers. Within marked conditions, handlers reported that dogs alerted more at marked locations than other locations. Handlers’ beliefs that scent was present potentiated handler identification of detection dog alerts. Human more than dog influences affected alert locations. This confirms that handler beliefs affect outcomes of scent detection dog deployments.     

Invisible displacement understanding in domestic dogs (<Emphasis Type="Italic">Canis familiaris</Emphasis>): the role of visual cues in search behavior

Recently, (Collier-Baker E, Davis JM, Suddendorf T (2004) J Comp Psychol 118:421–433) suggested that domestic dogs do not understand invisible displacements. In the present study, we further investigated the hypothesis that the search behavior of domestic dogs in invisible displacements is guided by various visual cues inherent to the task rather than by mental representation of an object’s past trajectory. Specifically, we examined the role of the experimenter as a function of the final position of the displacement device in the search behavior of domestic dogs. Visible and invisible displacement problems were administered to dogs (N = 11) under two conditions. In the Visible-experimenter condition, the experimenter was visible whereas in the Concealed-experimenter condition, the experimenter was visibly occluded behind a large rigid barrier. Our data supported the conclusion that dogs do not understand invisible displacements but primarily search as a function of the final position of the displacement device and, to a lesser extent, the position of the experimenter.     

Movement as a signal during classical conditioning

Analysis of the available data and that of the author disclosed the peculiarities of motor reaction when used as a conditioned stimulus. The author’s data showed that if signal value is attributed to a motor reaction (passive movement or movement evoked by the direct stimulation of the motor cortex), the changes of excitability in the motor cortex representation of the dog’s leg depend on the biological sign of the reinforcing stimulus during classic conditioning. They also remained the same during instrumental conditioning and were opposite in sign, showed increased excitability in the food situation, and decreased excitability in the defense situation. Using the movement as a conditional stimulus, we managed to uncover the commonality between classic and instrumental conditioning. This enabled us to answer questions, discussed by Pavlov and Guthrie, which, it seems to us, had not been convincingly answered during their time.     

An integrated device to evaluate a driver’s functional state

In the field of cognitive ergonomics, research on car drivers requires multimodal in-vehicle systems for recording not only driving-related behavior, but also contextual information from their surroundings. In addition, reliable information concerning a driver’s functional state should be obtained. In this article, we describe an integrated device simultaneously recording specific physiological data, video recordings of the driver and environment, parameters from the vehicle, and contextual data. Physiological signals from the autonomic nervous system provide objective and quantitative information on the driver’s alertness and his/her ability to process specific driving-related stimuli or other nonspecific information. Consequently, recorded physiological responses can be related to individual driving events. Electrodermal and cardiac activities are sensitive to time-dependent variations in arousal level and to certain external stimuli, so there is great interest in studying drivers’ behavior via measured physiological signals that have been established as suitable behavioral indicators. The present integrated device is capable of processing the relevant indices from raw measured data in real time.     

The Button to Make Poverty History &; How to Double Your Donation

Even if together we could make poverty history, we would not all do our part. The paper presents a device that makes it more likely for everybody to do his part. This is achieved by making everybody’s contribution dependent on the other people’s commitment to contribute given that certain conditions are fulfilled. Furthermore, a device is introduced which, based on the same general idea, doubles everybody’s donation. Finally, possibilities, assumptions and limitations of such devices are addressed.     

Ground zero for a post-moral ethics in J. M. Coetzee’s Disgrace and Julia Kristeva’s melancholic

Perhaps no other novel has received as much attention from moral philosophers as South African writer J. M. Coetzee’s Disgrace. The novel is ethically compelling and yet no moral theory explains its force. Despite clear Kantian moments, neither rationalism nor self-respect can account for the strange ethical task that the protagonist sets for himself. Calling himself the dog man, like the ancient Cynics, this shamelessly cynical protagonist takes his cues for ethics not from humans but from animals. He does not however claim much in the way of empathy or understanding of animals, and his own odd motives remain a puzzle throughout the stages of his ethical transformation. Many scholars approach Coetzee’s text through an ethics of alterity, and even argue that Disgrace is exemplary in this regard. Kristeva’s rendition of alterity ethics brings us close to the novel’s vision, and yet the novel points towards a more primordial basis for ethics in the search for meaning through the human encounter with other animal species.     

The Association of Externalizing Behavior and Parent–Child Relationships: An Intergenerational Study

We investigated the influence of the child’s behavior on the quality of the mutual parent–child attachment relationships across three generations. We did so using a prospective longitudinal study which spanned 20 years from adolescence through adulthood. Study participants completed in-class questionnaires as students in the East Harlem area of New York City at the first wave and provided follow-up data at 4 additional points in time. 390 participants were included in these analyses; 59% female, 45% African American, and 55% Puerto Rican. Using structural equation modeling, we determined that externalizing behavior in the child was negatively related to the mutual parent–child attachment relationship for two generations of children. We also found continuity in externalizing behavior for the participant over time and from the participant to his/her child. Additionally, we found continuity in the quality of the mutual attachment relationship from the participant’s relationship with his/her parents to the participant’s relationship with his/her child. Finally, the mutual attachment relationship of the participant with his/her parents had a negative association with the participant’s externalizing behavior in adulthood. Based on these results, we propose that family interventions should focus on the role of the child’s externalizing behavior in the context of the parent–child attachment relationship. Furthermore, we suggest that prevention programs should address externalizing behavior as early as possible, as the effects of externalizing behavior in adolescence can persist into adulthood and extend to the next generation.     

Rawlsian social-contract theory and the severely disabled

Martha Nussbaum has powerfully argued in Frontiers ofJustice and elsewhere that John Rawls’s sort of social-contract theory cannot usefully be deployed to deal with issues pertaining to justice for the disabled. To counter this claim, this article deploys Rawls’s sort of social-contract theory in order to deal with issues pertaining to justice for the disabled—or, since, as Nussbaum stresses, we all have some degree of disability—for the severely disabled. In this way, rather than questioning one by one Nussbaum’s interpretive claims about Rawls’s view, one can simply see how the Rawlsian framework can work in application to this issue. Following Rawls’s lead, the paper utilizes the idealized “initial choice situation” as an analytic and comparative device for examining alternative principles of justice, developing three different interpretations of the initial choice situation that each correspond to a different set of principles that apply to people of all levels of disability. One of these sets of principles is a simple extension of Rawls’s, one is very close to what Nussbaum herself recommends, and the third is a kind of hybrid. In this way, it is shown not only that Rawls’s social-contract device can usefully be applied to these issues, but also that it is helpful for exploring the deep commitments underlying each of these competing sets of principles. This extension to Rawls’s device clearly departs to some extent from his intentions; but the paper argues that the ideal of reciprocity, which might be thought to pose the biggest obstacle to applying his social-contract device to issues pertaining to the severely disabled (those who are not capable of being cooperative members of society), is not an independently essential commitment of his mature social-contract view, central though it was to Rawls’s thought in the 1950s.     

It’s under control: Top-down search strategies can override attentional capture

Bacon and Egeth (1994) proposed that observed instances of attentional capture by feature singletons (e.g., color) were the result of a salience-based strategy adopted by subjects (singleton detection mode) and, thus, were not automatic. They showed that subjects could override capture by adopting strategies based on searching for specific target features (feature search mode). However, Theeuwes (2004) has recently argued that Bacon and Egeth’s results arose from experimental confounds. He elaborated a model in which attentional capture must be expected when salient distractors fall within a spatialwindow of attention. According to Theeuwes’s (2004) model, there exist two essential criteria for examining stimulus-driven capture. First, search latencies cannot increase with display size, since the search must be parallel; second, the salience of the irrelevant distractor must not be compromised by characteristics of the search display. Contrary to the predictions of Theeuwes’s (2004) model, we provide evidence that involuntary capture can be overridden when both of these criteria are met. Our results are consistent with Bacon and Egeth’s proposal.     

The Role of Teacher Behavior Management in the Development of Disruptive Behaviors: An Intervention Study with the Good Behavior Game

The role of teacher behavior management for children’s disruptive behavior development (hyperactive and oppositional behavior) was investigated using a universal classroom preventive intervention study. Five-hundred seventy children were followed from second to third grade of elementary school. Observations of teacher behavior management and children’s on-task and off-task classroom behavior and peer reports of hyperactive and oppositional behavior were available. Results showed that the reduced use of negative remarks of intervention teachers predicted children’s increase in on-task behavior and decrease in talking-out behavior. These improved children’s classroom behaviors in turn mediated the impact of the intervention on the development of hyperactive and oppositional behavior over the studied period. These results were similar for girls and boys. The results underscore the role of teachers’ classroom management strategies in improving children’s classroom behavior, which, in turn is an important component in the reduction of disruptive behavior development.     

Involuntary capture of visual-spatial attention occurs for intersections,both real and “imagined”

In three spatial precuing experiments, we demonstrate attentional capture by an intersection that occurs (1) between two lines that are not part of an enclosed object, and (2) between a line in the cuing array that is not physically present during target search and the invisible circumference of a perceptual circle formed by the elements in the target array. This capture effect conceptually replicates Cole, Gellatly, and Blurton’s (2001)corner enhancement effect, in which responses are faster for targets presented near an object’s corners rather than along its straight edges. However, it extends that effect by showing that it occurs even when the intersection is not part of an enclosed object and is not physically present during target search. More important, our capture effect occurred even though the target’s position was not designated by a perceptually distinctive feature and was not predicted by the intersection’s position. Thus, it seems that a line intersection—whether it be real or imaginary—automatically captures visual—spatial attention, contrary to Folk, Remington, and Johnston’s (1992) and Gibson and Kelsey’s (1998) views that such an involuntary capture of spatial attention is contingent on attentional control settings.     

Scene context influences without scene gist: Eye movements guided by spatial associations in visual search

Although the use of semantic information about the world seems ubiquitous in every task we perform, it is not clear whether we rely on a scene’s semantic information to guide attention when searching for something in a specific scene context (e.g., keys in one’s living room). To address this question, we compared contribution of a scene’s semantic information (i.e., scene gist) versus learned spatial associations between objects and context. Using the flash-preview–moving-window paradigm Castelhano and Henderson (Journal of Experimental Psychology: Human Perception and Performance 33:753–763, 2007), participants searched for target objects that were placed in either consistent or inconsistent locations and were semantically consistent or inconsistent with the scene gist. The results showed that learned spatial associations were used to guide search even in inconsistent contexts, providing evidence that scene context can affect search performance without consistent scene gist information. We discuss the results in terms of hierarchical organization of top-down influences of scene context.     

Adult but not juvenile Barbary macaques spontaneously recognize group members from pictures

For group-living animals, it is crucial to distinguish one’s own group members from those of other groups. Studies applying operant conditioning revealed that monkeys living in relatively small groups are able to recognize their own group members when tested with photographs of group members and other conspecifics. Employing a simple looking time paradigm, we here show that Barbary macaques living in two social groups comprising 46 and 57 individuals, respectively, at the enclosure ‘La Forêt des Singes’ at Rocamadour are able to spontaneously distinguish photographs of members of their own group from those depicting animals that belong to another group. This ability appears to develop with age, as juveniles did not discriminate between members of their own group and another group, although they showed generally more interest in the pictures than did adults. Juveniles frequently displayed picture directed behaviours such as lip-smacking, touching and sniffing in both conditions, indicating that the stimuli were highly salient to them. In conclusion, it appears that at least adult monkeys are able to memorize the faces of a large number of individuals. Whether the difference in behaviour is based on individual recognition of one’s own group members or simply the discrimination based on familiarity remains unresolved. However, both mechanisms would be sufficient for group membership identification.     

Same-Sex and Other-Sex Peer Reports: Unique Contributors to Understanding Children’s School Adjustment

The present study proposed to understand how same-sex and other-sex peer nominations relate differently to teacher reports of children’s behaviors and measures of children’s friendships. Students provided peer nominations, mutual friend data, and social network data. Teachers rated students’ antisocial behavior and social competence. As expected, other-sex peer social preference scores predicted teacher ratings of antisocial behavior, while same-sex peer social preference scores predicted data on friendships and social groups. Unexpectedly, both same and other sex peer nominations predicted children’s teacher-rated social competence. Findings suggest that other-sex peers offer a unique perspective on children’s social behavior that is neither superfluous nor unimportant to understanding children’s psychosocial adjustment.     

Maintenance of mother-child aversive relationships: A fresh look at an old controversy

Data were obtained from 46 mother-child pairs from the Child Behavior Institute (CBI) at the University of Tennessee. These mother-child dyads were referred for psychological help because of the child’s aversive behavior. Child-parent interactions were quantified using a multi-code, observational system. Correlational and multiple regression analyses (stepwise) were conducted to find the best predictor of the child’s aversive behavior. Results showed that the child’s aversive behavior was significantly correlated with the mother’s aversive, indiscriminate, and compliance behaviors. The regression analysis showed mother’s aversive behavior to be the best predictor of the child’s aversive behavior. Moreover, our results seem to point out that the compliance hypothesis is more effective in predicting child aversive behavior than the predictability hypotheses. It appears that since the two hypotheses are dealing with similar processes, they are more complementary than oppositional. This study used data collected by the Child Behavior Institute (CBI) at the University of Tennessee, Knoxville. The authors are indebted to Robert Wahler, Michael Smith, and Sue Dunn for their helpful comments on this paper.     

How does dominance rank status affect individual and social learning performance in the dog (<Emphasis Type="Italic">Canis familiaris</Emphasis>)?

Dogs can learn effectively to detour around a V-shaped fence after observing a demonstration from either an unfamiliar human or dog demonstrator. We found earlier that there is substantial individual variation between the dogs’ performance, even when using the same experimental conditions. Here, we investigate if the subjects’ relative dominance rank with other dogs had an effect on their social learning performance. On the basis of the owners’ answers to a questionnaire, subjects from multi-dog homes were sorted into groups of dominant and subordinate dogs. In Experiment 1, dominant and subordinate dogs were tested without demonstration and we did not find any difference between the groups—they had similarly low detour performances on their own. In Experiment 2 and 3, dogs from single dog and multi-dog households were tested in the detour task with demonstration by an unfamiliar dog, or human, respectively. The results showed that social learning performance of the single dogs fell between the dominant and subordinate multi-dogs with both dog and human demonstration. Subordinate dogs displayed significantly better performance after having observed a dog demonstrator in comparison to dominant dogs. In contrast, the performance of dominant and subordinate dogs was almost similar, when they observed a human demonstrator. These results suggest that perceived dominance rank in its own group has a strong effect on social learning in dogs, but this effect seems to depend also on the demonstrator species. This finding reveals an intricate organization of the social structure in multi-dog households, which can contribute to individual differences existing among dogs.     

Landmark use by Clark’s nutcrackers (Nucifraga columbiana): influence of disorientation and cue rotation on distance and direction estimates

Many species have been shown to encode multiple sources of information to orient. To examine what kinds of information animals use to locate a goal we manipulated cue rotation, cue availability, and inertial orientation when the food-storing Clark’s nutcracker (Nucifraga columbiana) was searching for a hidden goal in a circular arena. Three groups of birds were used, each with a different goal–landmark distance. As the distance between the goal and the landmark increased, nutcrackers were less accurate in finding the correct direction to the goal than they were at estimating the distance (Experiment 1). To further examine what cues the birds were using to calculate direction, the featural cues within the environment were rotated by 90° and the birds were either oriented when searching (Experiments 2 and 3) or disoriented (Experiment 3). In Experiment 4, all distinctive visual cues were removed (both internal and external to the environment), a novel point of entry was used and the birds were either oriented or disoriented. We found that disorienting the nutcrackers so that they could not use inertial cues did not influence the birds’ total search error. The birds relied heavily but not completely on cues within the environment, as rotating available cues caused them to systematically shift their search behavior. In addition, the birds also relied to some extent on Earth-based cues. These results show the flexible nature of cue use by the Clark’s nutcracker. Our study shows how multiple sources of spatial information may be important for extracting multiple bearings for navigation.     

The Role of Friends’ Disruptive Behavior in the Development of Children’s Tobacco Experimentation: Results from a Preventive Intervention Study

Having friends who engage in disruptive behavior in childhood may be a risk factor for childhood tobacco experimentation. This study tested the role of friends’ disruptive behavior as a mediator of the effects of a classroom based intervention on children’s tobacco experimentation. 433 Children (52% males) were randomly assigned to the Good Behavior Game (GBG) intervention, a universal preventive intervention targeting disruptive behavior, and facilitating positive prosocial peer interactions. Friends’ disruptive behavior was assessed from age 7–10 years. Participants’ experimentation with tobacco was assessed annually from age 10–13. Reduced rates in tobacco experimentation and friends’ disruptive behavior were found among GBG children, as compared to controls. Support for friends’ disruptive behavior as a mediator in the link between intervention status and tobacco experimentation was found. These results remained after controlling for friends’ and parental smoking status, and child ADHD symptoms. The results support the role of friends’ disruptive behavior in preadolescents’ tobacco experimentation.