Parental factors in the sensitization and habituation of territorial aggression in the convict cichlid ( Cichlasoma nigrofasciatum).

In Exp I, 2 territorial pairs of convict cichlid fish per aquarium were observed over 12 days. Aggressive behavior waned, but there was considerable between-days variability that was linked to progression from one stage in the parental cycle to the next (i.e., from no spawn to eggs, to larvae, and to free-swimming fry). The size of territory increased as one or the other pair progressed to the next stage. In Exp II, aggression in isolated pairs was studied during progression through the parental cycle, with a short daily presentation of a conspecific used as the stimulus. This procedure permitted study of changes in aggression unconfounded by the habituation that occurred in Exp I. It was predicted from Exp I that aggression would show increases at each stage transition. The predictions were supported. In Exp III, pairs were allowed to progress into the parental cycle in visual isolation from each other. When the pairs satisfied the requirements of being at different stages in the cycle, they were allowed visual access to each other. The pair with the more advanced spawn was initially more aggressive, but the aggressive behaviors did habituate. Results support the general tenets of P. M. Groves and R. F. Thompson's (see record 1971-02046-001) dual-process theory of habituation. (20 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

A longitudinal study of negative affect and self-perceived competence in young adolescents.

In a 4-wave, 2-year longitudinal design, the authors obtained measures of negative affect (NA) and self-perceived competence from 220 boys and 216 girls who were 7th graders at the beginning of this study. NA was operationalized as the common dimension underlying self-reports of depressive symptoms, anxiety symptoms, and negative emotions. Self-perceived competence consisted of 2 higher order constructs: a well-behaved/good-student factor and an attractive/athletic/popular factor. Structural equation modeling revealed very high stability estimates for all constructs. Nevertheless, self-perceived competence in the attractive/athletic/popular domain predicted changes in NA. Conversely, NA predicted changes in self-perceived competence in the well-behaved/good-student domain. The primacy of NA versus self-cognitions depends, in part, on the type of self-cognitions being examined. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Validation of depression and anxiety measures in White and Black youths: Multitrait–multimethod analyses.

The authors obtained yearly self-report, peer nomination, and teacher rating assessments of depression symptoms, anxiety symptoms, and social acceptance on 2 cohorts of African American (ns?=?139 and 184) and Caucasian school children (ns?=?328 and 339), yielding a total of 6 waves of data between 3rd and 8th grade. Confirmatory factor analyses revealed that the measures manifested significant convergent and discriminant validity in both groups. Multigroup analyses further demonstrated that the measures were equally valid across ethnic groups. Peer nomination measures of depression and anxiety symptoms were biased, however, leading to the underestimation of psychopathology in African American children and adolescents. Allowing for this bias, the authors discovered that African American children evinced more signs of depression and anxiety in Grades 3, 4, and 5 than did Caucasian children. Such differences were not significant in Grades 6, 7, and 8. No ethnic group differences emerged on the social acceptance dimension. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Are cognitive errors of underestimation predictive or reflective of depressive symptoms in children: a longitudinal study

Children in Grades 3-8 participated in a longitudinal study of the relation between negative self-evaluation errors and symptoms of depression. Children's self-perceived competence in 5 domains (academic, social, athletic, appearance, and conduct) was compared with teachers' and peers' perceptions. Children's tendency to underestimate their competencies predicted increases in depression scores in only 1 of 6 grade levels. Children's depression scores predicted increases in the underestimation of self-competence over time in all grade levels. Gender differences and developmental differences in the cognitive errors associated with depression scores also emerged. Contrary to A. T. Beck's (1963, 1972) model, negative self-distortions appear to be more reflective than predictive of depression in children.     

Habituation, sensitization, and redirection of aggression and feeding behavior in the three-spined stickleback (Gasterosteus aculeatus L.).

In Exp I, 3-spined stickleback males maintained in individual aquaria built nests and defended the entire aquarium as a territory. Adjacent compartments containing another male, a gravid female, or a nongravid female provided a social context within which to study habituation and sensitization of aggression elicited by a conspecific male intruded into S's territory. Typical sensitization–habituation curves were found for all Ss regardless of kind of neighbor. However, behavior redirected as a result of stimulation of the intruded male differed between conditions. Ss with a male neighbor showed increased aggression toward the neighbor; Ss with a gravid female neighbor showed courtship; and Ss with nongravid female showed neither. A 3rd behavior, nest building, showed no difference between conditions. Exp II elicited the same motor response to the intruded stimulus, but the motivational category was changed by eliciting the behavior by presenting live brine shrimp. Aggression did not change during habituation, but the waning predation was redirected to another food-securing behavior, picking at the substrate. Results provide evidence for the important role that social context plays in understanding the redirection of behaviors, a phenomenon predicted from an extension of the dual-process theory of habituation. (20 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Structure and validity of parent and teacher perceptions of children's competence: A multitrait–multimethod–multigroup investigation.

Parents and teachers completed their respective versions of S. Harter's ( 1985b) Rating Scale of Children's Actual Behavior to assess 5 domains of competence in 321 3rd- and 403 6th-grade children. Peers completed a peer nomination index of multiple competencies. Confirmatory factor analyses revealed 5 factors in both the teacher and parent scales: Academic Competence, Social Acceptance, Athletic Competence, Physical Appearance, and Behavioral Conduct. Two higher order factors also emerged: a Well-Behaved/Good Student factor and an Athletic/Attractive/Popular factor. All 5 subscales of the teacher and parent scales manifested a high degree of discriminant validity. Significant levels of convergent validity emerged for most of these subscales. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Human fetal heart rate dishabituation between thirty and thirty-two weeks gestation

Few studies of human fetal habituation have included dishabituation procedures (i.e., assessment of the reemergence of a habituated response) to determine if response decrements are the result of reevaluation of information (a brain process) or fatigue of peripheral receptors. The purpose of this study is to describe the ability of the human fetus to learn and recall information with procedures to assess the central nervous system. Fetal heart rate (FHR) of 84 fetuses between 30 and 32 weeks gestational age was examined in response to 3 series of vibroacoustic (VA) stimuli presented at pseudorandom intervals of 25-45 s over the head of the fetus. Responses to the first series of 15 stimuli (S1) were compared with an identical second series of 15 stimuli (S1) presented over the head of the fetus. Between the 2 series, a novel (dishabituating) VA stimulus (S2) was presented, differing from S1 in intensity and frequency. The third series of S1s was applied to the mother's thigh as a control for possible maternal responses to the stimulus. Prestimulus FHR was computed during a 5 s interval before each stimulus, and mean FHR was computed during the intertrial interval (average FHR). The response to S1 during the first series of trials (1-15) produced a sustained rise in both prestimulus and average FHR, r(83) = .90, p < .001. After the novel S2 (trial 16) the rate of change was attenuated for average FHR, r(83) = .12, ns, to S1 for trials 17-31 but not prestimulus FHR, r(83) = .50, p < .001. The decrease in FHR response was reestablished when stimulation was applied to mother's thigh, trials 32-41, r(83) = .92, p < .001. A significant habituation pattern across trials was observed for the first series of S1s when prestimulus HR was subtracted from each preceding average FHR value (delta FHR). After the single novel stimulus (S2), the FHR response to S1 reemerged. All combinations of beginning and ending series slopes were compared, and only the rate of change during the last 4 trials of the initial presentation of S1 and the first 4 trials after the novel stimulus was significant, F(1, 82) = 9.21, p < .003. Uterine contractions collected from the continuous record were not related to the presentation of the novel stimulus, chi 2(1, N = 84) = 0.59, p < .50, ns, or delta FHR slope after the novel stimulus, chi 2(9, N = 84) = 10.52, p < .50, ns. These results established that the 32 week human fetus is capable of detecting, habituating, and dishabituating to an external stimulus and support the premise that areas of the human fetal central nervous system critical for detecting and discriminating information and for learning and memory have developed by the early third trimester.     

Relation between symptoms of anxiety and depression in children: A multitrait-multimethod-multigroup assessment.

Teacher, parent, peer, and self-ratings of depression and anxiety symptoms were obtained from 280 3rd-grade and 211 6th-grade children. Confirmatory factor analysis of these multitrait-multimethod data for 3rd graders revealed low but statistically significant levels of convergent validity, high levels of method variance, and an extremely high correlation between the depression and anxiety factors, even after controlling for shared method variance. Similar analyses of 6th graders revealed slightly higher levels of convergent validity and a somewhat smaller correlation between the depression and anxiety factors. The data support a unified construct model for younger children and are consistent with either a dual factor or a tripartite model of depression and anxiety in older children. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Cocaine exposure prebreeding to weaning: maternal and offspring effects

1. The distribution of NADPH-diaphorase positive and catecholamine-containing nerve structures, and functional noradrenergic-nitrergic interactions, were studied in the rat anococcygeus muscle. 2. The morphological findings demonstrated NADPH-diaphorase positive neurons mostly as aggregates in intramural ganglia, nerve tracts and few single nerve fibres forming plexus-like structures. 3. The nitric oxide synthase inhibitor NG-nitro-L-arginine (L-NOARG) inhibited concentration-dependently the nitrergic relaxation, an effect reversed by L-arginine. The drug had dual effects on noradrenergic contractile responses: at lower concentrations (0.1-10 microM) it decreased the amplitude of contractions and this was not affected by L-arginine; higher concentrations (50-500 microM) potentiated the contractions, an effect that was prevented by L-arginine. 4. The electron acceptor, nitro blue tetrazolium (NBT) produced a rapid inhibition of the noradrenergic contractile responses (EC50 0.178 +/- 0.041 microM). The drug decreased the tone of the preparations. However, it potentiated concentration-dependently the nitrergic relaxations. 5. NBT (1 microM) had no significant effect on the relaxations induced by exogenously applied nitric oxide (NO)-donor sodium nitroprusside (SNP, 0.01-50 microM). However, the effect of NBT (0.1-10 microM) on the electrically induced relaxation was significantly decreased by L-NOARG (10 and 50 microM). The inhibition was of a non-competitive type. 6. Neither L-NOARG (100 microM) nor NBT (1 microM) had any effect on the spontaneous or electrically-induced release of 3H-radioactivity from the tissues preincubated in [3H]-noradrenaline. 7. It is concluded that L-arginine-NO pathway can modulate noradrenergic transmission in the rat anococcygeus muscle at postjunctional, but not prejunctional site(s).