Contextual Pavlovian conditioning in the crab Chasmagnathus

In contextual conditioning, a complex pattern of information is processed to associate the characteristics of a particular place with incentive or aversive reinforcements. This type of learning has been widely studied in mammals, but studies of other taxa are scarce. The context-signal memory (CSM) paradigm of the crab Chasmagnathus has been extensively used as a model of learning and memory. Although initially interpreted as habituation, some characteristics of contextual conditioning have been described. However, no anticipatory response has been detected for animals exposed to the training context. Thus, CSM could be interpreted either as an associative habituation or as contextual conditioning that occurs without a context-evoked anticipatory response. Here, we describe a training protocol developed for contextual Pavlovian conditioning (CPC). For each training trial, the context (conditioned stimulus, CS) was discretely presented and finished together with the unconditioned stimulus (US). In agreement with the CSM paradigm, a robust freezing response was acquired during the 15 training trials, and clear retention was found when tested with the US presentation after short (2 and 4 h) and long (1–4 days) delays. This CPC memory showed forward but not simultaneous presentation conditioning and was context specific and protein synthesis dependent. Additionally, a weak CPC memory was enhanced during consolidation. One day after training, CPC was extinguished by repeated CS presentation, while one presentation induced a memory labilisation–reconsolidation process. Finally, we found an anticipatory conditioned response (CR) during the CS presentation for both short-term (4 h) and long-term memory (24 h). These findings support the conditioning nature of the new paradigm.     

The effects of humor and depression labels on reactions to social comments

Humor is generally considered to facilitate social relationships, whereas depression has been related to difficulties in relationships. This study investigated the effects of labeling social comments as humorous, as well as labeling the presenter of the comments as feeling depressed, on recipients' reactions to these comments. To this end, 350 university students were presented with vignettes describing four styles of comments (i.e., affiliative, self-enhancing, self-defeating, and aggressive) made by a casual acquaintance. Participants were randomly assigned to one of four conditions. These conditions varied in terms of whether the four styles of comments were described as humorous or not, and whether the acquaintance making the comments was described as feeling depressed or not. Findings indicated that humor led to more positive reactions. Labeling the acquaintance as depressed led to more negative reactions than when the acquaintance was labeled non-depressed, particularly when the comments were self-defeating. Interestingly, when the acquaintance was described as feeling depressed, affiliative comments made in a humorous fashion led to more positive reactions than did non-humorous affiliative comments. These findings are discussed in terms of the effects of humor and depression on interpersonal interactions.     

Chronic sildenafil (Viagra) administration reduces anxiety in intact and castrated male rats

Epidemiological research indicates that sildenafil (Viagra) abuse is associated with increased risk behaviors. The present study employs the open field, a standard animal model used in the field of anxiety research, to examine whether chronic exposure to sildenafil affects anxiety and risk-taking behaviors in gonadally intact and castrated male Wistar rats. Sildenafil (10 mg/kg) or saline were administered three times a week for three weeks. Animals were tested once a week in the open field during and after drug treatment. Sildenafil treatment increased the number of center entries and time spent in the center in intact and castrated animals during and after treatment, suggesting that repeated drug use decreases anxiety. Sildenafil also restored the deficits in exploration and locomotion produced by castration, indicating that sildenafil effects on open field behaviors are independent of endogenous androgens. We caution against generalizing from this study to human behaviors, but propose that the behavioral effects produced by a chronic high dose of sildenafil warrant further studies into its abuse potential.     

Object manipulability affects children’s and adults’ conceptual processing

Research on kinds of concepts indicates that children use perceptual and functional information differently to form natural and artifact concepts. Beyond object domain, object manipulability appears to be a decisive factor in adult conceptual processing. Thus, the effect of object manipulability on conceptual processing was tested in 5- and 7-year-olds and adults using a picture matching task. Reaction times for identifying conceptual relations on the basis of perceptual similarity (e.g., jacket-coat) and contextual/functional information (e.g., jacket-hanger) were analyzed according to object manipulability and domain. Both children and adults were faster to identify contextual/functional relations for manipulable than for nonmanipulable objects. Conversely, they were faster to identify perceptual similarity relations for nonmanipulable than for manipulable objects, particularly for natural concepts. Results reveal an early distinction between concepts of manipulable and nonmanipulable objects. Implications for further research on concept formation and for embodied views of concepts are discussed.     

An Essay In The Aid Of Writing History: Fictions Of Historiography

In what follows I explore the question of fictionality in history writing. First, I venture into the unfamiliar genre of ego-histoire and make my own professional training in the tenets of positivist or realist historiography an object of theoretical reflection and critical analysis. Then as a way of dealing with the literary dimension of written history, I make a canonical work in history of education an object of rhetorical analysis. Finally, as another way of coming to terms with the “fictions of historiography,” I revisit one of my own productions and make it an object of metacritical consideration. My central theme is that historiographical realism alone will not suffice , that historians are as dependant upon literary invention as upon documents, that history cannot be written without the aid of the “fictions of historiography,” and that the difference between the historian and the novelist is narrower than we may have been accustomed to think. I further argue that attention to the literary or rhetorical dimension of history is long overdue in history of education, where it flourishes unacknowledged. I conclude that historical writing is not just a literary pastime and the issue remains: how to come to grips with fictionalizing and the truth claims of historiography.     

Is the matching familiar figures test a measure of cognitive style? A warning for users

A probabilistic model of reflection-impulsivity as measured by the Matching Familiar Figures Test (MFFT) is presented and tested on 77 fourth graders. In testing the model two groups emerged, a random response group (n = 22) and a cognitive response group (n = 55), who use the evaluation process. Correlations among latencies, total errors, initial errors, school-scores, and IQs were compared for our total sample and the two groups. The correlation of MFFT latencies and errors disappeared for the random-response group and new correlations with errors appeared while the cognitive response group kept a statistically significant correlation of latencies with errors and no other error correlation was shown. This last group was classified by Kagan's median-split procedure showing that most reflective subjects kept their classification. Preliminary results suggest a reinterpretation of reflection-impulsivity literature, especially as related to the impulsive style.     

Daily life activity patterns among the elderly: is what they claim to do what they wish to do?

This study is aimed at exploring daily and desired activity patterns in a sample of older people, as well as at examining some influence factors and their relationships to life satisfaction. Our sample was made of 154 retired people living in urban areas and whose age was greater than 60 years old. Data about activities were gathered by means of an interview while life satisfaction scores were obtained by applying LSI scale. Our results show how the pattern of activities that our participants say to have done yesterday is quite similar to an ideal pattern, although in the ideal day time spent with other people is far greater. Factors like gender and economic and educational level have an influence on patters of activity, especially on instrumental and leisure ones. The difference between yesterday and ideal activities was negatively related to life satisfaction. Such a relationship was modest, but reached statistical significance.