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481.
Transforming the core array in Tucker three-way component analysis to simplicity is an intriguing way of revealing structures
in between standard Tucker three-way PCA, where the core array is unconstrained, and CANDECOMP/PARAFAC, where the core array
has a generalized diagonal form. For certain classes of arrays, transformations to simplicity, that is, transformations that
produce a large number of zeros, can be obtained explicitly by solving sets of linear equations. The present paper extends
these results. First, a method is offered to simplifyJ ×J × 2 arrays. Next, it is shown that the transformation that simplifies anI ×J ×K array can be used to also simplify the (complementary) arrays of order (JK −I) ×J ×K, of orderI × (IK −J) ×K and of orderI ×J × (IJ −K). Finally, the question of what constitutes the maximal simplicity for arrays (the maximal number of zero elements) will
be considered. It is shown that cases of extreme simplicity, considered in the past, are, in fact, cases of maximal simplicity. 相似文献
482.
Roberto Refinetti 《Integrative Physiological and Behavioral Science》2002,37(2):114-127
Although the functional aspects of synchronization of the circadian pacemaker by environmental light have been extensively studied, few studies have provided systematic information about the temporal organization of behavior under light-dark cycles with varying proportions of light and darkness. In the present study, the running-wheel activity profiles of mice were investigated under short, medium, and long photoperiods. The results clearly indicated that the temporal distribution of locomotor activity in mice is modulated by photoperiod. The activity profile was compressed under long photoperiods and expanded under short photoperiods. Although negative masking by light and alterations in the state of dark adaptation may have partially accounted for the phenomenon, the major mechanism seemed to be a compression and expansion of the circadian pacemaker's cycle, as expressed in the compression and expansion of the photic phase-response curve. 相似文献
483.
Kozasa EH Santos RF Rueda AD Benedito-Silva AA De Ornellas FL Leite JR 《Psychological reports》2008,103(1):271-274
Siddha Samadhi Yoga is a program in which meditation is associated with pranayama (breathing exercises). 22 volunteers with anxiety complaints (M age = 42.8 yr., SD = 10.3) were assigned to two groups: 14 attended the yoga group, and 8 attended a waiting-list or control group. They were evaluated before the intervention and 1 month after it on the State-Trait Anxiety Inventory, the Beck Depression Inventory, Tension Feelings Self-evaluation Scales, and the Well-being Self-evaluation Scales. A significant reduction in scores on anxiety, depression, and tension was found in yoga group, as well as an increase in well-being in comparison with the control group. 相似文献
484.
Vargas-Pérez H Sellings LH Paredes RG Prado-Alcalá RA Díaz JL 《Journal of motor behavior》2008,40(6):587-593
The authors investigated the effect of the opioid antagonist naloxone on wheel-running behavior in Balb/c mice. Naloxone delayed the acquisition of wheel-running behavior, but did not reduce the expression of this behavior once acquired. Delayed acquisition was not likely a result of reduced locomotor activity, as naloxone-treated mice did not exhibit reduced wheel running after the behavior was acquired, and they performed normally on the rotarod test. However, naloxone-blocked conditioned place preference for a novel compartment paired previously with wheel running, suggesting that naloxone may delay wheel-running acquisition by blocking the rewarding or reinforcing effects of the behavior. These results suggest that the endogenous opioid system mediates the initial reinforcing effects of wheel running that are important in acquisition of the behavior. 相似文献
485.
Psychache and suicide: a preliminary investigation 总被引:1,自引:0,他引:1
Pompili M Lester D Leenaars AA Tatarelli R Girardi P 《Suicide & life-threatening behavior》2008,38(1):116-121
Shneidman's Psychological Pain Assessment Scale (PPAS; 1999) was administered to 88 psychiatric patients. Both current and worst-ever psychache were significantly higher in those patients judged by a psychiatrist, on the basis of a structured clinical interview, to be at risk of suicide. However, current and worstever psychache were not associated with having attempted suicide in the past. Thus, for the present sample of psychiatric patients, the PPAS appears to be more sensitive to current suicidality than to past suicidality. Further, there are validity issues with the PPAS, with the need for multi-item measures and probably a multifactor measure. 相似文献
486.
Dennis NA Hayes SM Prince SE Madden DJ Huettel SA Cabeza R 《Journal of experimental psychology. Learning, memory, and cognition》2008,34(4):791-808
To investigate the neural basis of age-related source memory (SM) deficits, young and older adults were scanned with fMRI while encoding faces, scenes, and face-scene pairs. Successful encoding activity was identified by comparing encoding activity for subsequently remembered versus forgotten items or pairs. Age deficits in successful encoding activity in hippocampal and prefrontal regions were more pronounced for SM (pairs) as compared with item memory (faces and scenes). Age-related reductions were also found in regions specialized in processing faces (fusiform face area) and scenes (parahippocampal place area), but these reductions were similar for item and SM. Functional connectivity between the hippocampus and the rest of the brain was also affected by aging; whereas connections with posterior cortices were weaker in older adults, connections with anterior cortices, including prefrontal regions, were stronger in older adults. Taken together, the results provide a link between SM deficits in older adults and reduced recruitment of hippocampal and prefrontal regions during encoding. The functional connectivity findings are consistent with a posterior-anterior shift with aging previously reported in several cognitive domains and linked to functional compensation. 相似文献
487.
Roberto Nuevo Miguel A. Ruiz María Izal Ignacio Montorio Andrés Losada María Márquez-González 《Journal of psychopathology and behavioral assessment》2008,30(4):252-260
The controversy concerning the validity and reliability of generalized anxiety disorder (GAD) appears to be particularly relevant
in the elderly, since physical symptoms associated with GAD can readily be considered as the consequences of normal aging.
This study aims to analyze the structure invariance of a questionnaire assessing the DSM-IV diagnostic criteria across samples
of older adults and college students. Ninety-seven adults aged 65 or over and 130 college students completed the Worry and
Anxiety Questionnaire (WAQ). The results revealed that factorial invariance could be assumed and, in addition, that scores
for severity of GAD symptoms were higher in younger subjects than in older ones. The results support the applicability of
DSM-IV criteria for GAD in elderly people, as the factorial structure of the WAQ was the same for this age group as for younger
adults. A higher degree of GAD severity was found in the younger sample.
相似文献
Roberto NuevoEmail: |
488.
João Roberto Ventura de Oliveira Marco Aurélio Romano-Silva Herbert Ugrinowitsch Tércio Apolinário-Souza Lidiane Aparecida Fernandes Juliana Otoni Parma 《Journal of motor behavior》2019,51(3):272-280
In aiming movements the limb position drifts away from the defined target after some trials without visual feedback, a phenomenon defined as proprioceptive drift (PD). There are no studies investigating the association between the posterior parietal cortex (PPC) and PD in aiming movements. Therefore, cathodal and sham transcranial direct current stimulation (tDCS) were applied to the left PPC concomitantly with the performance of movements with or without vision. Cathodal tDCS applied without vision produced a higher level of PD and higher rates of drift accumulation while it decreased peak velocity and maintained the number of error corrections, not affecting movement amplitude. The proprioceptive information seems to produce an effective reference to movement, but with PPC stimulation it causes a negative impact on position. 相似文献
489.
Barbara M. Burns Jennifer Merritt Laura Chyu Roberto Gil 《American journal of community psychology》2019,63(3-4):338-354
In this practice‐oriented program review, a mindfulness‐based, trauma‐informed parent intervention, called Safe, Secure and Loved? (SSL), designed to strengthen nurturing parenting and children's resilience, was implemented in an underserved Latino community. Across 5 years, a volunteer community workforce of promotoras transformed an academic–community research partnership into a community‐led program partnership and established sustainable agency parent education programming. To better understand this transformation, we used a modified implementation science (IS) framework to structure interviews from members of the academic–community research partnership. Findings suggest that the commitment and cultural expertise of the volunteer community workforce acted as the major leadership drivers to create the community‐led program partnership. Employing mindfulness‐based, trauma‐informed parent education designed to promote nurturing parenting and children's resilience may be an effective training model to engage and mobilize a volunteer community workforce from an underserved community. 相似文献
490.
Da Cunha C Wietzikoski S Wietzikoski EC Silva MH Chandler J Ferro MM Andreatini R Canteras NS 《Neurobiology of learning and memory》2007,87(4):451-463
The bilateral intranigral infusion of 1 micromol 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) in adult male Wistar rats caused a specific and partial loss of substantia nigra pars compacta (SNc) dopamine neurons, a partial depletion of striatal dopamine, and a deficit to learn the intra-maze cued version of the Morris water maze. Pre-training the SNc rats in the spatial version of the water maze or simply maintaining the animals on the water maze platform reversed this deficit. This improvement was even observed when the order of the extra-maze cues presented to the rats during pre-training of the spatial version was changed during training of the intra-maze cued version. However, this deficit was not reversed either by maintaining the animals on the platform if the spatial cues were surrounded and covered with a curtain or by swimming sessions in the maze without the escape platform and the curtain. These findings suggest that none of the following elements alone, learned during the spatial task pre-training, could help SNc rats learn the intra-maze cued task: improvement of swimming skills or knowledge of the existence of the escape platform; distance between the platform and the border of the pool; location of a particular extra-maze cue; relations among extra-maze cues. However, the simultaneous presence of the escape platform and extra-maze cues (irrespective of their relational configuration) during the pre-training sessions proved to be necessary for this improving effect to occur. 相似文献