Conceptual Hierarchies in a Flat Attractor Network: Dynamics of Learning and Computations

The structure of people's conceptual knowledge of concrete nouns has traditionally been viewed as hierarchical ( Collins & Quillian, 1969 ). For example, superordinate concepts ( vegetable ) are assumed to reside at a higher level than basic-level concepts ( carrot ). A feature-based attractor network with a single layer of semantic features developed representations of both basic-level and superordinate concepts. No hierarchical structure was built into the network. In Experiment and Simulation 1, the graded structure of categories (typicality ratings) is accounted for by the flat attractor network. Experiment and Simulation 2 show that, as with basic-level concepts, such a network predicts feature verification latencies for superordinate concepts ( vegetable ). In Experiment and Simulation 3, counterintuitive results regarding the temporal dynamics of similarity in semantic priming are explained by the model. By treating both types of concepts the same in terms of representation, learning, and computations, the model provides new insights into semantic memory.     

The Experiences of Indigenous Australian Psychologists at University

Disparities exist between Indigenous Australians and non‐Indigenous Australians on indicators of life expectancy, alcohol and drug use, adult and juvenile incarceration, and rates of hospitalisation for self‐harm, suicide, and mental and behavioural disorders due to psychoactive substance use. Psychology is a discipline that can assist in remedying these issues, yet disparities are evident in Indigenous participation in higher education generally, as well as within tertiary psychology education specifically. Ten Indigenous Australian psychologists were interviewed to investigate possible barriers and enablers for Indigenous students studying psychology at university. Hermeneutic phenomenology guided the research and its analysis, whereby the data went through a process known as the “hermeneutic circle”; data were analysed in itself, as well as part of the whole, leading to the world views of the participant and researcher converging into a “horizon of meaning.” Sources of support for Indigenous students included family support, financial assistance, and Indigenous student support centres. Potential barriers to university study of psychology were negative conceptions of higher education and psychology by the Indigenous community, “culture shock” upon relocating to the metropolitan area, a lack of Indigenous content and staff, and culturally insensitivity by staff members. Efforts should be made to address these barriers to participation, as well as to support those structures and services that were supportive for students.     

The homogeneity effect on figure/ground perception in infancy

We examined whether the homogeneity of the two profiles of Rubin's goblet affects figure/ground perception in infants. We modified the two profiles of Rubin's goblet in order to compare figure/ground perception under four test patterns: (1) two profiles painted with horizontal lines (horizontal-line condition), (2) two profiles painted middle gray (uni-color condition), (3) one profile painted light gray and the other dark gray (two-color condition), and (4) a goblet painted with concentric circles (concentric-circles condition). In the horizontal-line condition the homogeneity of the profile was strengthened, and in the two-color condition the homogeneity of the profile was weakened compared to the uni-color condition, which was an original Rubin's goblet. In the concentric-circles condition the homogeneity of the reversed areas of the horizontal-line were strengthened.     

Association between serotonin transporter gene polymorphism and family history of attempted and completed suicide

The purpose of this study was to examine the association of the serotonin transporter gene to family history of suicidality. Forty-seven volunteers responded to questionnaires about family history of suicide, and provided buccal swabs for analysis of the polymorphism. Allelic homozygocity (the short variant) was associated with family history of suicidality. These data, to be interpreted with the study's limitations in mind, suggest a link between the serotonin transporter gene polymorphism and suicide-related variables, which should be the focus of future research.     

Inference in the Wild: A Framework for Human Situation Assessment and a Case Study of Air Combat

Situation awareness is a key construct in human factors and arises from a process of situation assessment (SA). SA comprises the perception of information, its integration with existing knowledge, the search for new information, and the prediction of the future state of the world, including the consequences of planned actions. Causal models implemented as Bayesian networks (BNs) are attractive for modeling all of these processes within a single, unified framework. We elicited declarative knowledge from two Royal Australian Air Force (RAAF) fighter pilots about the information sources used in the identification (ID) of airborne entities and the causal relationships between these sources. This knowledge was represented in a BN (the declarative model) that was evaluated against the performance of 19 RAAF fighter pilots in a low‐fidelity simulation. Pilot behavior was well predicted by a simple associative model (the behavioral model) with only three attributes of ID. Search for information by pilots was largely compensatory and was near‐optimal with respect to the behavioral model. The average revision of beliefs in response to evidence was close to Bayesian, but there was substantial variability. Together, these results demonstrate the value of BNs for modeling human SA.     

Self‐compassion Is Best Measured as a Global Construct and Is Overlapping with but Distinct from Neuroticism: A Response to Pfattheicher,Geiger, Hartung,Weiss, and Schindler (2017)

Pfattheicher and colleagues recently published an article entitled ‘Old Wine in New Bottles? The Case of Self‐compassion and Neuroticism’ that argues the negative items of the Self‐compassion Scale (SCS), which represent reduced uncompassionate self‐responding, are redundant with neuroticism (especially its depression and anxiety facets) and do not evidence incremental validity in predicting life satisfaction. Using potentially problematic methods to examine the factor structure of the SCS (higher‐order confirmatory factor analysis), they suggest a total self‐compassion score should not be used and negative items should be dropped. In Study 1, we present a reanalysis of their data using what we argue are more theoretically appropriate methods (bifactor exploratory structural equation modelling) that support use of a global self‐compassion factor (explaining 94% of item variance) over separate factors representing compassionate and reduced uncompassionate self‐responding. While self‐compassion evidenced a large correlation with neuroticism and depression and a small correlation with anxiety, it explained meaningful incremental validity in life satisfaction compared with neuroticism, depression, and anxiety. Findings were replicated in Study 2, which examined emotion regulation. Study 3 established the incremental validity of negative items with multiple well‐being outcomes. We conclude that although self‐compassion overlaps with neuroticism, the two constructs are distinct. © 2018 European Association of Personality Psychology