Involvement of the mesolimbic system in palatability-induced ingestion.
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Animals↗
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Results for “Choice Behavior”
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Acquisition of a matching-to-sample task in young and middle-aged male and female rats.
Male and female rats were trained in a water-reinforced matching-to-sample task. The rule was acquired more rapidly by the females. After initial training, the retention of the rule was measured when the rats were twelve and 14 months old. The performance of neither group was modified at twelve months, but at 14 months, while no change appeared in the performance of males, females showed a drop in correct responses. Training in a modified device which made the task more difficult induced no changes in performance. Final training (at 18 months) showed the drop in performance in females had persisted. The decline of performance in middle-aged females might be related to the ageing female reproductive system.
Aging↗
Outcome expectations drive learned behaviour in larval Drosophila.
Why does Pavlov's dog salivate? In response to the tone, or in expectation of food? While in vertebrates behaviour can be driven by expected outcomes, it is unknown whether this is true for non-vertebrates as well. We find that, in the Drosophila larva, odour memories are expressed behaviourally only if animals can expect a positive outcome from doing so. The expected outcome of tracking down an odour is determined by comparing the value of the current situation with the value of the memory for that odour. Memory is expressed behaviourally only if the expected outcome is positive. This uncovers a hitherto unrecognized evaluative processing step between an activated memory trace and behaviour control, and argues that learned behaviour reflects the pursuit of its expected outcome. Shown in a system with a simple brain, an apparently cognitive process like representing the expected outcome of behaviour seems to be a basic feature of behaviour control.
Animals↗
Hippocampal damage and exploratory preferences in rats: memory for objects, places, and contexts.
Rats have a natural tendency to spend more time exploring novel objects than familiar objects, and this preference can be used as an index of object recognition. Rats also show an exploratory preference for objects in locations where they have not previously encountered objects (an index of place memory) and for familiar objects in contexts different from those in which the objects were originally encountered (an index of context memory). In this experiment, rats with cytotoxic lesions of the hippocampal formation were tested on all three versions of the novelty-preference paradigm, with a 5-min retention interval between the familiarization and test phases. Rats with sham lesions displayed a novelty preference on all three trial types, whereas the rats with hippocampal lesions displayed a novelty preference on Object trials but did not discriminate between the objects on Place trials or Context trials. The findings indicate that hippocampal damage impairs memory for contextual or spatial aspects of an experience, whereas memory for objects that were part of the same experience are left relatively intact.
Animals↗
Concurrent and longitudinal relations between children's playground behavior and social preference, victimization, and bullying.
Prior research with contrived play groups suggests that how children interact with one another can influence their social relationships, but few studies have been carried out to determine if this is the case in naturalistic settings. This study examined the concurrent and longitudinal links between four observational measures of 8- to 9-year-old children's (N = 89) playground behaviors/peer contacts (Alone, Conversation, Group Size, and Network) and three sociometric measures of their peer relationships (Social Preference, Bully, and Victim). The latter were assessed at 2 points within a school year, the first corresponding with the playground observations and the second 5 months later. Several of the concurrent correlations were found to be significant. For boys, Group Size was positively correlated with Bully Score and Social Preference Score, but negatively correlated with Victim Score; and time Alone was positively correlated with Victim Score. For girls, time Alone was positively correlated with Victim Score; Network was negatively correlated with Bully Score but positively correlated with Social Preference Score; and Group Size was positively correlated with Social Preference Score. The longitudinal analyses indicated that for boys, elevated levels of time Alone and, separately, Conversation, predicted the highest increases in Victim Score. For girls, low levels of time Alone predicted the sharpest increases in Social Preference Score. There was also some marginally significant evidence, p < .06, that among girls, high levels of time Alone predicted the greatest increases in Bully Score, and high levels of Conversation predicted the greatest increases in Social Preference Score. The theoretical and practical importance of these links between children's nonaggressive playground behaviors and their emerging peer relationships are discussed.
Child↗
Numerical subtraction in the pigeon: evidence for a linear subjective number scale.
When humans and animals compare two numbers, responding is faster and more accurate with increasing numerical disparity and decreasing numerical size. Researchers explaining these distance and size effects often, assume that the subjective number continuum is logarithmically compressed. An alternative hypothesis is that the subjective number continuum is linear, but positions farther along it are proportionately fuzzier, that is, less precisely located. These two hypotheses have been treated as functionally equivalent because of their similar empirical predictions. The current experiment sought to resolve this issue with a paradigm originally developed to address the subjective representation of time (time left). In our adaptation, pigeons were required to compare a constant number with the number remaining after a numerical subtraction. Our results indicate that subjective number is linearly, not logarithmically, related to objective number.
Animals↗
Subtracting pigeons: logarithmic or linear?
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Animals↗
Resource partitioning in sympatric delphinids: space use and habitat preferences of Australian snubfin and Indo-Pacific humpback dolphins.
1. Many species of delphinids co-occur in space and time. However, little is known of their ecological interactions and the underlying mechanisms that mediate their coexistence. 2. Snubfin Orcaella heinsohni, and Indo-Pacific humpback dolphins Sousa chinensis, live in sympatry throughout most of their range in Australian waters. I conducted boat-based surveys in Cleveland Bay, north-east Queensland, to collect data on the space and habitat use of both species. Using Geographic Information Systems, kernel methods and Euclidean distances I investigated interspecific differences in their space use patterns, behaviour and habitat preferences. 3. Core areas of use (50% kernel range) for both species were located close to river mouths and modified habitat such as dredged channels and breakwaters close to the Port of Townsville. Foraging and travelling activities were the dominant behavioural activities of snubfin and humpback dolphins within and outside their core areas. 4. Their representative ranges (95% kernel range) overlapped considerably, with shared areas showing strong concordance in the space use by both species. Nevertheless, snubfin dolphins preferred slightly shallower (1-2 m) waters than humpback dolphins (2-5 m). Additionally, shallow areas with seagrass ranked high in the habitat preferences of snubfin dolphins, whereas humpback dolphins favoured dredged channels. 5. Slight differences in habitat preferences appear to be one of the principal factors maintaining the coexistence of snubfin and humpback dolphins. I suggest diet partitioning and interspecific aggression as the major forces determining habitat selection in these sympatric species.
Animals↗
Spatial memory deficits in middle-aged mice correlate with lower exploratory activity and a subordinate status: role of hippocampal neurotrophins.
The aim of the present work was to relate age-related individual differences in cognitive function with behavioural strategies employed in social and non-social challenges. To this purpose, the behaviour of adult (5-month-old) and middle-aged (13-month-old) CD-1 mice was scored in the social interaction, plus-maze, Morris water maze (MWM) and open-field tests. In addition, brain levels of nerve growth factor and brain-derived neurotrophic factor (BDNF) were analysed and correlated with the behaviours scored. Compared to adults, middle-aged mice showed greater anxiety in both non-social and social situations, spending less time in the open arms of the plus-maze and performing more freezing behaviour in response to aggression. Based upon their behaviour in the social interaction test, adult and middle-aged subjects were classified as dominant or subordinate and their behaviour in the open field, plus-maze and MWM tests subjected to factor analysis, taking into account age and social status. Results highlighted meaningful differences in exploratory strategies as a function of social status only in middle-aged subjects. In particular, middle-aged dominants were, overall, more explorative than same-aged subordinates, spending less time in peripheral areas and approaching more readily a novel object. Interestingly, in middle-aged mice, superior performance in the MWM task was associated with exploratory strategies exploited by dominants. At adulthood, BDNF hippocampal levels, but not specific behaviours, were positively correlated with the ability to learn a spatial task. Overall, data indicate that, in middle-aged subjects individual differences in exploratory strategies, rather than neurotrophin levels, are able to predict the degree of impairment in a spatial learning task.
Age Factors↗
Intentionality as measured in the persistence and elaboration of communication by chimpanzees (Pan troglodytes).
In human infancy, 2 criteria for intentional communication are (a) persistence in and (b) elaboration of communication when initial attempts to communicate fail. Twenty-nine chimpanzees (Pan troglodytes) were presented with both desirable (a banana) and undesirable food (commercial primate chow). Three conditions were administered: (a) the banana was delivered (successful communication), (b) half of the banana was delivered (partially successful communication), and (c) the chow was delivered (failed communication). The chimpanzees exhibited persistence in and elaboration of their communication in every condition except when the banana was delivered. Thus, their communication was about a specific item, demonstrating that both intentionality and nonverbal reference are capacities shared by humans with our nearest living relatives, the great apes.
Animal Communication↗
Teaching pigeons to commit base-rate neglect.
Whereas humans display base-rate neglect in a behavioral analogue of the base-rate problem, pigeons have been shown to behave optimally in a comparable task, appropriately weighting base-rate and case-cue information. Previous studies have shown that prior experience may interfere with optimal decisions for human subjects, a result consistent with the position that poor and illogical decisions often follow from the misapplication of learned rules. The present study shows that pigeons will also display base-rate neglect if given extensive pretraining with informative case cues. Two experiments with pigeons, in a matching-to-sample procedure designed to mimic the classic base-rate problem, show that pigeons display base-rate neglect after extensive pretraining with the matching task.
Animals↗
When questions change behavior: the role of ease of representation.
In three experiments, we examined the mere-measurement effect, wherein simply asking people about their intent to engage in a certain behavior increases the probability of their subsequently engaging in that behavior. The experiments demonstrate that manipulations that should affect the ease of mentally representing or simulating the behavior in question influence the extent of the mere-measurement phenomenon. Participants who were asked about their intention to engage in various behaviors were more likely to engage in those behaviors than participants not asked about their intentions in situations in which mentally simulating the behavior in the intention question was relatively easy. We tested this ease-of-representation hypothesis using both socially desirable and socially undesirable behaviors, and our dependent variables comprised both self-reports and actual behaviors. Our findings have implications for survey research in various social contexts, including assessments of risky behaviors by public health organizations.
Behavior Control↗
The search for wellbeing in alternative and complementary health practices.
This article is premised on a need to understand and analyse how those turning to alternative and complementary medicines conceptualise the role of these practices; to ask what kind of 'health' is produced through alternative and complementary medicines and how might the help provided by these practices relate to questions of identity, self and subjectivity? Even though alternative and complementary medicines can be utilised in the face of serious illness, the healing produced through these practices is here argued to transcend physiological health and relate rather to a subjectively assessed sense of 'wellbeing'. In this article, I analyse what this wellbeing entails, in particular, in terms of contemporary understandings of selfhood as well as in relation to the production of appropriate emotions through 'emotion management'. I argue that the wellbeing produced through alternative and complementary health practices can be conceptualised as a means of asserting a particular kind of self as well as a means of negotiating identities offered to people in wider societal discourses and institutions. This article is based on qualitative interviews with both practitioners and users of varied alternative and complementary medicines. The focus is on women's experiences.
Adolescent↗
The emergence of social cognition in three young chimpanzees.
We report a series of 10 studies on the social-cognitive abilities of three young chimpanzees. The studies were all ones previously conducted with human infants. The chimpanzees were 1-5 years of age, had been raised mostly by humans, and were tested mostly directly by a familiar human experimenter. First, in a longitudinal investigation with repeated measurements from a social-cognitive test battery, the three young chimpanzees were similar in many ways to human infants; the major difference was a total lack of attempts to share attention with others either in joint attentional interactions or through declarative gestures. Second, in imitation-based tests of the understanding of intentional action, the chimpanzees, like human infants, showed an understanding of failed attempts and accidents; but they did not pay attention to the behavioral style of the actor or the actor's reasons for choosing a particular behavioral means. Third, in tests of their understanding of visual perception, the chimpanzees followed the gaze direction of a human to an out-of-sight location behind a barrier and gestured more to a human who could see them than to one who could not; but they showed no understanding that perceivers can focus their attention on one thing, or one aspect of a thing, within their perceptual fields for a reason. Finally, in tests of joint intentions and joint attention, the chimpanzees showed no ability to either reverse roles with a partner in a collaborative interaction or to set up a joint attentional framework for understanding the communicative intentions behind a pointing gesture. Taken together, these findings support the idea that the early ontogeny of human social cognition comprises two distinct trajectories, each with its own evolutionary history: one for understanding the basics of goal-directed action and perception, common to all apes, and another for sharing psychological states with others in collaborative acts involving joint intentions and attention, unique to the human species.
Affect↗
Behavioral and biologic aspects of marijuana use.
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Adult↗
Behavior modification in a state mental hospital: a participant-observer's critique.
Token economy behavior modification has become a popular and voluminously reported strategy for altering the behavior of patients in mental hospital back wards. This paper provides a qualitative, process view of one such token economy program. It reports subject perspectives, as well as interactions among experimenters, hospital staff, and patients. Questions are raised in regard to the overall effectiveness of such programs in alleviating the problems of mental patients.
Adolescent↗
Measuring the reinforcing strength of abused drugs.
Animal models for human diseases are highly valued for their utility in developing new therapies. Animals have long provided suitable platforms for the development of innovative surgical procedures and for the study of disease states that are relatively easy to produce in otherwise healthy animals, such as diabetes or hypertension. Increasingly, new strains of animals susceptible to common human illnesses are being introduced into medical research, promising new inroads into the treatment of a variety of organic disorders. Despite these advances in model development, psychiatric disorders, by and large, remain among the hardest to induce experimentally, and the search for reasonable animal procedures to study diseases of the mind is an ongoing challenge for experimental biologists. An exception to this limitation, however, comes in the study of drug abuse. Major developments in this area of research over the last several decades have steadily advanced our ability to identify pharmacological, genetic, and environmental determinants that contribute to the development of drug dependence and addictive behavior.
Animals↗
Why do we need randomised controlled trials to assess behavioural interventions?
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Behavior Therapy↗