Motor resources in peripersonal space are intrinsic to spatial encoding: Evidence from motor interference

The aim of this study was to explore the role of motor resources in peripersonal space encoding: are they intrinsic to spatial processes or due to action potentiality of objects? To answer this question, we disentangled the effects of motor resources on object manipulability and spatial processing in peripersonal and extrapersonal spaces. Participants had to localize manipulable and non-manipulable 3-D stimuli presented within peripersonal or extrapersonal spaces of an immersive virtual reality scenario. To assess the contribution of motor resources to the spatial task a motor interference paradigm was used. In Experiment 1, localization judgments were provided with the left hand while the right dominant arm could be free or blocked. Results showed that participants were faster and more accurate in localizing both manipulable and non-manipulable stimuli in peripersonal space with their arms free. On the other hand, in extrapersonal space there was no significant effect of motor interference. Experiment 2 replicated these results by using alternatively both hands to give the response and controlling the possible effect of the orientation of object handles. Overall, the pattern of results suggests that the encoding of peripersonal space involves motor processes per se, and not because of the presence of manipulable stimuli. It is argued that this motor grounding reflects the adaptive need of anticipating what may happen near the body and preparing to react in time.     

Factor Validity of the Beck Hopelessness Scale in Italian Medical Patients

The aim of the present study was to assess the factor structure of the Italian version of the Beck Hopelessness Scale (BHS) in a large sample of patients with medical conditions, comparing four different models proposed previously in the literature. Participants were 514 Italian adult patients with diagnoses of chronic daily headache, type 1 (insulin-dependent) or type 2 diabetes mellitus, epilepsy, open-angle glaucoma, human immunodeficiency virus infection, and women admitted for childbirth to a Department of Fetal–Maternal Medicine. All the patients were administered the BHS during routine visits. Confirmatory factor analyses were used to compare four models using several fit indices. The one-construct two-method model (i.e., the BHS measures one substantive hopelessness construct plus artifacts due to negative–positive item polarity) had the best fit indices and was more parsimonious than other models. The BHS seems to be a unidimensional measure of hopelessness, although there may be artifacts due to item polarity (i.e., positively and negatively worded items). Hopelessness scores differed in patients with particular medical diseases, with higher scores in conditions such as chronic daily headache and diabetes, and lower scores in patients positive for the human immunodeficiency virus (HIV), and with open-angle glaucoma or epilepsy.     

Encoding geometric and non-geometric information: a study with evolved agents

Vertebrate species use geometric information and non-geometric or featural cues to orient. Under some circumstances, when both geometric and non-geometric information are available, the geometric information overwhelms non-geometric cues (geometric primacy). In other cases, we observe the inverse tendency or the successful integration of both cues. In past years, modular explanations have been proposed for the geometric primacy: geometric and non-geometric information are processed separately, with the geometry module playing a dominant role. The modularity issue is related to the recent debate on the encoding of geometric information: is it innate or does it depend on environmental experience? In order to get insight into the mechanisms that cause the wide variety of behaviors observed in nature, we used Artificial Life experiments. We demonstrated that agents trained mainly with a single class of information oriented efficiently when they were exposed to one class of information (geometric or non-geometric). When they were tested in environments that contained both classes of information, they displayed a primacy for the information that they had experienced more during their training phase. Encoding and processing geometric and non-geometric information was run in a single cognitive neuro-representation. These findings represent a theoretical proof that the exposure frequency to different spatial information during a learning/adaptive history could produce agents with no modular neuro-cognitive systems that are able to process different types of spatial information and display various orientation behaviors (geometric primacy, non-geometric primacy, no primacy at all).     

The central amygdala projection to the substantia nigra reflects prediction error information in appetitive conditioning

The central amygdala nucleus (CeA) plays a critical role in cognitive processes beyond fear conditioning. For example, intact CeA function is essential for enhancing attention to conditioned stimuli (CSs). Furthermore, this enhanced attention depends on the CeA's connections to the nigrostriatal system. In the current study, we examined the role of the CeA's connections to two midbrain dopamine regions, the substantia nigra pars compacta (SNc) and the ventral tegmental area (VTA), in processing CS information when predictions of reward or nonreward were confirmed or disconfirmed. Initially, two different retrograde tracers were injected into the SNc and the VTA of rats, to label CeA cells. Different groups of rats then received a visual CS either paired or unpaired with food. Finally, Fos induction was assessed after a test session in which rats were exposed to the visual CS alone or paired with food. Colabeling of Fos and the retrograde tracer(s) showed that CeA neurons projecting to the SNc, but not to the VTA, were engaged in processing CS information when the training and testing conditions differed. These results suggest that the CeA-nigral pathway represents prediction error information during appetitive conditioning.     

Measurement of External Shame: An Inside View

The aims of this study were to investigate the construct validity of the Other as Shamer scale (OAS) using confirmatory factor analysis (CFA) and to examine the psychometric properties of its Italian version in a sample of 687 nonclinical individuals. The CFA results indicated that the hypothesized hierarchical model (with 1 higher order factor and 3 first-order factors) was the best fitting solution. Cronbach's alpha indexes, as well as test–retest stability, provided satisfactory results. Correlations of the OAS total score and its subscales with the Beck Depression Inventory–II (rs = .30–.48) and the Teate Depression Inventory (rs = .32–.45) were both substantial and significant (p < .01). Receiver operating characteristic curves were constructed to indicate sensitivity and specificity of the OAS and its subscales when determining those nonclinical subjects who met clinical thresholds for depression symptoms. A series of cutoff scores for the OAS scale and its subscales was developed, with sensitivity values between .70 and .62, and specificity values between .71 and .62, indicating good to fair discrimination between the 2 groups (depressed vs. nondepressed). The theoretical and practical implications of these results were discussed.     

High school students' perceptions of AIDS risk: realistic appraisal or motivated denial?

We examined perceptions of risk for acquired immunodeficiency syndrome (AIDS) in 296 high school students living in or near a major urban center. We hypothesized that students with a dispositional tendency to deny threat would be more likely to misperceive their risk of contracting AIDS. Results indicated that study participants, overall, used their behaviors as a basis for assessing personal risk in the sense that they perceived higher risk when their behavior was in fact riskier. However, this relation did not hold for those students classified as repressors on a repression-sensitization scale; repressors' perceptions of absolute (but not comparative) risk were negatively correlated with degree of behavioral risk. In a secondary analysis, perceived absolute risk was found to be a significant predictor of intention to change AIDS-risk behaviors. This study provides support for a motivational interpretation of perceived invulnerability and has implications for the development of models of health behavior change.     

Action Observation and Imagery Training Improve the Ease With Which Athletes Can Generate Imagery

Imagery can improve sport performance, although its efficacy is mediated by the ease with which athletes can generate images. Establishing techniques that improve this imagery ability factor is desirable to enhance the effectiveness of imagery interventions. Twenty-seven club-level female golfers were assigned to imagery, action observation, or physical practice training groups (n = 9). Changes in image generation ease were assessed using the Revised Movement Imagery Questionnaire over an 8-week period. Imagery and action observation training were both effective in improving aspects of imagery ability. Action observation can provide sport psychologists with an effective tool for improving visual imagery ability in athletes.     

Learning strategy selection in the water maze and hippocampal CREB phosphorylation differ in two inbred strains of mice

Learning strategy selection was assessed in two different inbred strains of mice, C57BL/6 and DBA/2, which are used for developing genetically modified mouse models. Male mice received a training protocol in a water maze using alternating blocks of visible and hidden platform trials, during which mice escaped to a single location. After training, mice were required to choose between the spatial location where the platform had been during training (a place strategy) and a visible platform presented in a new location (a cued/response strategy). Both strains of mice had similar escape performance on the visible and hidden platform trials during training. However, in the strategy preference test, C57BL/6 mice selected a place strategy significantly more often than DBA/2 mice. Because much evidence implicates the hippocampus and striatum as important neural substrates for spatial/place and cued/response learning, respectively, the engagement of the hippocampus was then assessed after either place or cue training by determining levels of cAMP response element-binding protein (CREB) and phosphorylated CREB (pCREB) in these two mouse strains. Results revealed that hippocampal CREB levels in both strains of mice were significantly increased after place in comparison to cued training. However, the relation of hippocampal pCREB levels to training was strain dependent; pCREB was significantly higher in C57BL/6 mice than in DBA/2 mice after place training, while hippocampal pCREB levels did not differ between strains after cued training. These findings indicate that pCREB, specifically associated with place/spatial training, is closely tied to differences in spatial/place strategy preference between C57BL/6 and DBA/2 mice.