Opposing effects on muscarinic acetylcholine receptors in the piriform cortex of odor-trained rats

We combined pharmacological studies and electrophysiological recordings to investigate modifications in muscarinic acetylcholine (ACh) receptors (mAChR) in the rat olfactory (piriform) cortex, following odor-discrimination rule learning. Rats were trained to discriminate between positive and negative cues in pairs of odors, until they reached a phase of high capability to learn unfamiliar odors, using the same paradigm (“rule learning”). It has been reported that at 1–3 d after the acquisition of odor-discrimination rule learning, pyramidal neurons in the rat piriform cortex show enhanced excitability, due to a reduction in the spike-activated potassium current I_AHP, which is modulated by ACh. Further, ACh and its analog, carbachol (CCh), lost the ability to reduce the I_AHP in neurons from trained rats. Here we show that the reduced sensitivity to CCh in the piriform cortex results from a decrease in the number of mAChRs, as well as a reduction in the affinity of the receptors to CCh. Also, it has been reported that 3–8 d after the acquisition of odor-discrimination rule learning, synaptic transmission in the piriform cortex is enhanced, and paired-pulse facilitation (PPF) in response to twin stimulations is reduced. Here, intracellular recordings from pyramidal neurons show that CCh increases PPF in the piriform cortex from odor-trained rats more than in control rats, suggesting enhanced effect of ACh in inhibiting presynaptic glutamate release after odor training.     

Acculturative stress, social support, and coping: relations to psychological adjustment among Mexican American college students

This study examined the relations between acculturative stress and psychological functioning, as well as the protective role of social support and coping style, in a sample of 148 Mexican American college students (67% female, 33% male; mean age = 23.05 years, SD = 3.33). In bivariate analyses, acculturative stress was associated with higher levels of anxiety and depressive symptoms. Moreover, active coping was associated with better adjustment (lower depression), whereas avoidant coping predicted poorer adjustment (higher levels of depression and anxiety). Tests of interaction effects indicated that parental support and active coping buffered the effects of high acculturative stress on anxiety symptoms and depressive symptoms. In addition, peer support moderated the relation between acculturative stress and anxiety symptoms. Implications for reducing the effects of acculturative stress among Mexican American college students are discussed.     

Sexual risk taking in adolescence: the role of self-regulation and attraction to risk

Precursors of adolescent sexual risk taking were examined in a multiethnic sample consisting of 443 children (51% girls) of National Longitudinal Survey of Youth participants. Respondents were 12-13 years old in 1994 and 16-17 in 1998. Controlling for demographic and contextual factors, self-regulation--but not risk proneness--was significantly (modestly) associated with overall sexual risk taking 4 years later. Analyses of individual sexual behaviors indicated that self-regulation may affect choices made after becoming sexually active (e.g., number of partners) rather than the initiation of sexual activity. Measures of parent and peer influence had independent effects on sexual risk taking but did not moderate the effects of self-regulation and risk proneness. Findings add to the growing literature on implications of self-regulation for individual development.     

Detailed analysis of the male copulatory motor pattern in mammals: hormonal bases

Data obtained, using a polygraphic technique, on the characteristics of the motor and genital copulatory responses of male rabbits, rats, mice, hamsters, and guinea pigs are reviewed. This methodology provided detailed information, not accessible to other analyses, on the frequency and dynamic organization of copulatory pelvic thrusting trains of the species studied. This comparative analysis showed that: (1) The male rat may display two types of ejaculatory responses, differing in the dynamic organization of the pelvic thrusting train, and in the duration of the intravaginal thrusting period preceding ejaculation. (2) In the guinea pigs and small rodents, but not in rabbits, pelvic thrusting at ejaculatory responses persists during intromission, and a period of fast intravaginal thrusting is associated with ejaculation. (3) The motor copulatory pattern of the rabbit, but not of the rat, hamster, or guinea pig, is affected by castration and hormone treatment, suggesting that, in rabbits, androgen acts both on motivation and on the spinal neural systems related to copulation.     

Linguistic constraints on statistical computations: the role of consonants and vowels in continuous speech processing

Speech is produced mainly in continuous streams containing several words. Listeners can use the transitional probability (TP) between adjacent and non-adjacent syllables to segment "words" from a continuous stream of artificial speech, much as they use TPs to organize a variety of perceptual continua. It is thus possible that a general-purpose statistical device exploits any speech unit to achieve segmentation of speech streams. Alternatively, language may limit what representations are open to statistical investigation according to their specific linguistic role. In this article, we focus on vowels and consonants in continuous speech. We hypothesized that vowels and consonants in words carry different kinds of information, the latter being more tied to word identification and the former to grammar. We thus predicted that in a word identification task involving continuous speech, learners would track TPs among consonants, but not among vowels. Our results show a preferential role for consonants in word identification.     

Developmental stability and change in self-regulation from childhood to adolescence

The authors examined the developmental course of self-regulation in a cohort of children from the National Longitudinal Survey of Youth. The longitudinal sample included 646 children (48% girls; 52% boys; 36.2% Black, 23.4% Hispanic, 40.4% White) who were 4 to 5 years old in 1986 and who were followed up at ages 8 to 9 and ages 12 to 13. Levels of self-regulation (assessed with 12 maternal-report items that measured regulation of affect, behavior, attention) increased from early childhood (when sample children were 4 or 5 years old) to middle childhood (ages 8 or 9), but not from middle childhood to early adolescence (ages 12 or 13). Girls exhibited significantly higher levels of self-regulation than did boys at all 3 time points. Individual differences in self-regulation were fairly stable across the 8-year span (rs = .47 to .50). Comparisons of 1-, 2-, and 3-factor models suggested that the different aspects of self-regulation are highly interrelated, and support adoption of a single-factor model for both genders. The authors discuss implications of these findings for theory and intervention.     

Get lucky: situationism and circumstantial moral luck

Situationism is, roughly, the thesis that normatively irrelevant environmental factors have a great impact on our behaviour without our being aware of this influence. Surprisingly, there has been little work done on the connection between situationism and moral luck. Given that it is often a matter of luck what situations we find ourselves in, and that we are greatly influenced by the circumstances we face, it seems also to be a matter of luck whether we are blameworthy or praiseworthy for our actions in those circumstances. We argue that such situationist moral luck, as a variety of circumstantial moral luck, exemplifies a distinct and interesting type of moral luck. Further, there is a case to be made that situationist moral luck is perhaps more worrying than some other well-discussed cases of (supposed) moral luck.     

Can shame memories become a key to identity? The centrality of shame memories predicts psychopathology

This study investigates the premise that a shame memory can become a central component of personal identity, a turning point in the life story and a reference point for everyday inferences. We assessed shame, centrality of shame memory, depression, anxiety, stress and traumatic stress reactions in 811 participants from general population (481 undergraduate students and 330 subjects from normal population) to explore the interactions between these variables. Results show that early shame experiences do indeed reveal centrality of memory characteristics. Furthermore, the centrality of shame memories is associated with current feelings of internal and external shame in adulthood. Key to our findings is that the centrality of shame memories shows a unique and independent contribution to depression, anxiety and stress prediction, even when controlling for shame measures. In addition, our results show that the centrality of shame memories is highly and positively associated with traumatic stress reactions. Copyright © 2010 John Wiley & Sons, Ltd.     

Culture,art and artifice: theatre as a laboratory for identity / Cultura,arte y artificio: el teatro como laboratorio de identidades

Abstract

This paper approaches theatre performance as a laboratory for the simulation of behaviour. The preparation of the professional production of a theatre play was observed and videotaped with the purpose of studying (a) the process of production of artefacts for giving sense to the play and each of its scenes, (b) shaping the identity of the characters, and (c) how these artefacts were reshaped and readjusted in successive rehearsals. Results support the thesis that the process of production of a scenic text can act as a simulation model for how cultural artefacts, conscious processes and behaviour get articulated when developing a character’s identity.