Photometric, geometric, and perceptual factors in illumination-independent lightness constancy

It has been shown that lightness constancy depends on the articulation of the visual field (Agostini & Galmonte, 1999). However, among researchers there is little agreement about the meaning of "articulation." Beyond the terminological heterogeneity, an important issue remains: What factors are relevant for the stability of surface color perception? Using stimuli with two fields of illumination, we explore this issue in three experiments. In Experiment 1, we manipulated the number of luminances, the number of reflectances, and the number of surfaces and their spatial relationships; in Experiment 2, we manipulated the luminance range; finally, in Experiment 3 we varied the number of surfaces crossed by the illumination edge. We found that there are two relevant factors in optimizing lightness constancy: (1) the lowest luminance in shadow and (2) the co-presence of patches of equal reflectance in both fields of illumination. The latter effect is larger if these patches strongly belong to each other. We interpret these findings within the albedo hypothesis.     

Why professional athletes need a prolonged period of warm-up and other peculiarities of human motor learning

Professional athletes involved in sports that require the execution of fine motor skills must practice for a considerable length of time before competing in an event. Why is such practice necessary? Is it merely to warm-up the muscles, tendons, and ligaments, or does the athlete's sensorimotor network need to be constantly recalibrated? In this article, the authors present a point of view in which the human sensorimotor system is characterized by: (a) a high noise level and (b) a high learning rate at the synaptic level (which, because of the noise, does not equate to a high learning rate at the behavioral level). They argue that many heuristics of human skill learning, including the need for a prolonged period of warm-up in experts, follow from these assumptions.     

Outline of a general model of measurement

Measurement is a process aimed at acquiring and codifying information about properties of empirical entities. In this paper we provide an interpretation of such a process comparing it with what is nowadays considered the standard measurement theory, i.e., representational theory of measurement. It is maintained here that this theory has its own merits but it is incomplete and too abstract, its main weakness being the scant attention reserved to the empirical side of measurement, i.e., to measurement systems and to the ways in which the interactions of such systems with the entities under measurement provide a structure to an empirical domain. In particular it is claimed that (1) it is on the ground of the interaction with a measurement system that a partition can be induced on the domain of entities under measurement and that relations among such entities can be established, and that (2) it is the usage of measurement systems that guarantees a degree of objectivity and intersubjectivity to measurement results. As modeled in this paper, measurement systems link the abstract theory of measuring, as developed in representational terms, and the practice of measuring, as coded in standard documents such as the International Vocabulary of Metrology.     

Teaching for Creativity Scales: An Instrument to Examine Teachers’ Perceptions of Factors That Allow for the Teaching of Creativity

Creativity is valuable for individuals and society; it is thus important to understand how creativity can be fostered and encouraged. Teachers have a unique opportunity to promote creativity among their students. Teaching for Creativity Scales analyze constructs that influence teachers’ perceptions of teaching for creativity. Approximately 650 teachers completed the survey. In the exploratory factor analysis, the items fit a 4-factor structure, producing 4 subscales: teacher self-efficacy, environmental encouragement, societal value, and student potential. The instrument was revised and distributed to additional teachers for a confirmatory factor analysis. With a few item deletions, the proposed model was a good fit for the data (CMIN/df = 1.819, CFI = .923, TLI rho2 = .917, RMSEA = .053). With continued testing and revisions, this instrument could be useful for measuring perceptional changes due to designed interventions, comparing different populations of teachers, and describing creativity perceptions at a given school.     

Self-Care as Key to Others' Care: The Perspectives of Globally Situated Experienced Senior-Level Sport Psychology Practitioners

Engaging in self-care has been proposed as a means of counteracting work–life stress that can negatively impact efforts by sport psychology practitioners (SPPs) to effectively and ethically care for their clients. Utilizing Hill's Consensual Qualitative Research methodological approach, researchers examined the perceptions, experiences, and meanings that 20 internationally located, experienced, senior-level SPPs attributed to their self-care. The researchers identified 3 main domains: (a) defining self-care for SPPs, (b) describing the self-care challenges SPPs faced, and (c) identifying the strategies used to overcome those challenges. The experienced and senior-level practitioners participating in this study recognized a need to sustain a relatively balanced approach in their professional and personal lives. They presented a perspective of self-care as necessary to effectively support and provide care for clients. The SPPs identified self-care as an important contributor to their sport psychology professional quality of life. Study findings have implications for the well-being of both novice and more experienced SPPs.     

Felt obligation and the family life cycle: A study on intergenerational relationships

Since the 1990s researchers have considered as the dominant view on family obligation a set of responsibilities, duties, and obligation of care and assistance, that adult children should assume when parents are old or infirm. This concept is limited, because it assumes that family obligation is salient only in one period of life: when parents reach old age and are infirm. In contrast, a relational approach to family obligation considers family relationships as central to understanding children's duties and responsibilities. Following Stein, family obligation can be defined as felt obligation: expectations for appropriate and negotiated behaviour, perceived within the context of specific personal relationships with kin across life course. Felt obligation is conceptualized in five dimensions: a duty to maintain contact, assistance, avoidance of conflict, personal sharing, and self‐sufficiency. The purpose of the present study was to analyze perceptions of felt obligation in intergenerational relationships (parent–child and family of origin) in different phases of the family life cycle in a specific cultural context (Italy). The sample was composed of 92 parents with children of different ages (infants, school‐aged children, and young adults). The measure addressed the five dimensions of felt obligation, all assessed in various phases of family life. Results indicated differences in dimensions of felt obligation between intergenerational relationships (both parent–child and with family of origin). Some of these differences, such as self‐sufficiency and personal sharing, assumed more importance and salience in some periods of the life cycle than in others.     

Addendum to: Heterogeneity Coefficients for Mahalanobis' D as a Multivariate Effect Size

In a previous paper (Del Giudice, 2017 [Heterogeneity coefficients for Mahalanobis' D as a multivariate effect size. Multivariate Behavioral Research, 52, 216–221]), I proposed two heterogeneity coefficients for Mahalanobis' D based on the Gini coefficient, labeled H and EPV. In this addendum I discuss the limitations of the original approach and note that the proposed indices may overestimate heterogeneity under certain conditions. I then describe two revised indices H₂ and EPV₂, and illustrate the difference between the original and revised indices with some real-world data sets.     

Posture affects emotional responses: A Head Down Bed Rest and ERP study

Body posture, mainly represented by horizontal bed rest, has been found to be associated with cortical inhibition, altered perceptual and cognitive processing. In the present research, the influence of Head Down Bed Rest (HDBR) – a condition also termed simulated microgravity – on emotional responses has been studied. Twenty-two male subjects were randomly assigned to either Sitting Control or HDBR group. After 3-h, subjects attended to a passive viewing emotional task in which 75 IAPS slides, divided into 25 pleasant, 25 neutral and 25 unpleasant, were presented in random order for 6 s each, while EEG was recorded from F7, F8 and Pz locations. Results showed in Sitting Controls the expected greater P300 and Late Positive Potential (LPP) to pleasant and unpleasant compared with neutral slides, an effect which indicates greater processing of emotional arousing stimuli. The HDBR group showed smaller non-significant differences among all emotional conditions in both ERP components. Arousal and valence subjective evaluations, typically less sensitive to experimental manipulation, did not differentiate groups. The observed ability of HDBR to inhibit cortical emotional responses raises an important issue on the risk that astronauts underestimate a dangerous/threatening situation or that long-term bedridden inpatients develop depressive symptoms.     

Memory for symmetry and perceptual binding in patients with schizophrenia

The present study investigated the use of perceptual binding processes in schizophrenic (SC) patients and matched healthy controls, by examining their performance on the recall of symmetrical (vertical, horizontal and diagonal) and asymmetrical patterns varying in length between 2 and 9 items. The results showed that, although SC patients were less accurate than controls in all conditions, both groups recalled symmetrical patterns better than asymmetrical ones. The impairment of SC patients was magnified with supra-span symmetrical arrays, and they were more likely to reproduce symmetrical patterns as asymmetrical, particularly at medium and high length levels. Hierarchical regression analyses further indicated that the between-group differences in the recall of supra-span vertical and horizontal arrays, which require a greater involvement of visual pattern processes, remained significant after removing the variance associated with performance on asymmetrical patterns, which primarily reflects intrafigural spatial processes. It is proposed that schizophrenia may be associated with a specific deficit in the formation and retrieval of the global visual images of studied patterns and in the use of the on-line information about the type of symmetry being tested to guide retrieval processes.