Irrelevant sensory stimuli interfere with working memory storage: Evidence from a computational model of prefrontal neurons

The encoding of irrelevant stimuli into the memory store has previously been suggested as a mechanism of interference in working memory (e.g., Lange & Oberauer, Memory, 13, 333–339, 2005; Nairne, Memory & Cognition, 18, 251–269, 1990). Recently, Bancroft and Servos (Experimental Brain Research, 208, 529–532, 2011) used a tactile working memory task to provide experimental evidence that irrelevant stimuli were, in fact, encoded into working memory. In the present study, we replicated Bancroft and Servos’s experimental findings using a biologically based computational model of prefrontal neurons, providing a neurocomputational model of overwriting in working memory. Furthermore, our modeling results show that inhibition acts to protect the contents of working memory, and they suggest a need for further experimental research into the capacity of vibrotactile working memory.     

Genetic Counseling Supervisor Competencies: Results of a Delphi Study

Clinical supervision is a critical component of genetic counseling student preparation, yet empirically-determined competencies for genetic counseling supervisors are lacking. In this study a modified, two-round Delphi method was used to gain consensus about important genetic counseling supervisor knowledge, characteristics, and skills. Program directors and assistant directors of American Board of Genetic Counseling accredited genetic counseling programs in North America (N?=?33) were invited to participate and to recruit three experienced supervisors. Seventy-four individuals completed Round 1 and, of these, 61 completed Round 2. Approximately two-thirds were clinical supervisors from prenatal, pediatrics, cancer, and adult clinics; one-third were program directors. Participants rated the importance for genetic counseling supervisors of 158 items derived from supervision literature in allied health professions. They rated 142 items (89.9 %) as highly important. Content analysis of these items yielded six supervisor competency domains: Personal traits and characteristics; relationship building and maintenance; student evaluation; student centered supervision; guidance and monitoring of patient care; and ethical and legal aspects of supervision. The results provide a basis for training genetic counseling supervisors and for further research to refine and validate supervisor competencies.     

Regularity of unit length boosts statistical learning in verbal and nonverbal artificial languages

Humans have remarkable statistical learning abilities for verbal speech-like materials and for nonverbal music-like materials. Statistical learning has been shown with artificial languages (AL) that consist of the concatenation of nonsense word-like units into a continuous stream. These ALs contain no cues to unit boundaries other than the transitional probabilities between events, which are high within a unit and low between units. Most AL studies have used units of regular lengths. In the present study, the ALs were based on the same statistical structures but differed in unit length regularity (i.e., whether they were made out of units of regular vs. irregular lengths) and in materials (i.e., syllables vs. musical timbres), to allow us to investigate the influence of unit length regularity on domain-general statistical learning. In addition to better performance for verbal than for nonverbal materials, the findings revealed an effect of unit length regularity, with better performance for languages with regular- (vs. irregular-) length units. This unit length regularity effect suggests the influence of dynamic attentional processes (as proposed by the dynamic attending theory; Large & Jones (Psychological Review 106: 119–159, 1999)) on domain-general statistical learning.     

The Role of Parenting in Relational Aggression and Prosocial Behavior among Emerging Adults

This study investigated the role of remembered parenting styles and parental psychological control in the prediction of relational aggression and prosocial behavior in a college student sample (N = 323). Participants’ retrospective ratings of how they were parented were related to relational aggression and prosocial behavior; however, somewhat different relationships emerged for African American and White participants. Permissive parenting, authoritative parenting, and parental psychological control predicted relational aggression. Participant race and all 3 parenting styles (authoritarian, authoritative, and permissive) predicted prosocial behavior. Participant race moderated the relationship between psychological control and prosocial behavior. Specifically, parental psychological control was inversely related to prosocial behavior for African American, but not White, participants.     

Towards a distributed account of conceptual knowledge

How is conceptual knowledge organized and represented? Are domains (such as living things) and categories (such as tools, fruit) represented explicitly or can domain and category structure emerge out of a distributed system? Taken at face value, evidence from brain-damaged patients and neuroimaging studies suggests that conceptual knowledge is explicitly structured in independent content-based stores. However, recent analyses of the fine-grained details of semantic impairments, combined with research using connectionist modelling, suggest a different picture - one in which concepts are represented as patterns of activation over multiple semantic properties within a unitary distributed system. Within this context, category-specific deficits emerge as a result of differences in the structure and content of concepts rather than from explicit divisions of conceptual knowledge in separate stores.     

One Family at a Time: A Prevention Program for At‐Risk Parents

The purpose of this study was to examine the effectiveness of a psychoeducational parenting program with at‐risk parents of young children. At‐risk was defined as excessive parental use of verbal and corporal punishment combined with low‐income status. All families were seen for 10 weeks, either individually or in very small groups. Results showed that compared with the control group, parents participating in the program significantly decreased their levels of verbal and corporal punishment, anger, stress, and reported child behavior problems; results were maintained at follow‐up. Implications for counselors are provided.