The formation of structurally relevant units in artificial grammar learning

A total of 78 adult participants were asked to read a sample of strings generated by a finite state grammar and, immediately after reading each string, to mark the natural segmentation positions with a slash bar. They repeated the same task after a phase of familiarization with the material, which consisted, depending on the group involved, of learning items by rote, performing a shortterm matching task, or searching for the rules of the grammar. Participants formed the same number of cognitive units before and after the training phase, thus indicating that they did not tend to form increasingly large units. However, the number of different units reliably decreased, whatever the task that participants had performed during familiarization. This result indicates that segmentation was increasingly consistent with the structure of the grammar. A theoretical account of this phenomenon, based on ubiquitous principles of associative memory and learning, is proposed. This account is supported by the ability of a computer model implementing those principles, PARSER, to reproduce the observed pattern of results. The implications of this study for developmental theories aimed at accounting for how children become able to parse sensory input into physically and linguistically relevant units are discussed.     

High Level of Footshock during Inhibitory Avoidance Training Prevents Amnesia Induced by Intranigral Injection of GABA Antagonists

Disruption of synaptic activity of a number of cerebral structures (e.g., neostriatum, amygdala, and thalamus) produces marked deficits in retention of instrumentally conditioned behaviors. When animals are given a relatively high number of training trials or high intensities of footshock during learning, however, such disruption is considerably less effective. Since there is a close anatomical and functional relationship between the neostriatum and the substantia nigra, it was of interest to determine whether enhanced training with a high level of footshock would prevent the reported amnesic state induced by injections of GABA antagonists into the latter structure. Rats were trained in a one-trial inhibitory task, using 0.2 or 0.4 mA, and then injected with microgram quantities of picrotoxin or bicuculline into the substantia nigra and posterior region of the zona incerta; retention was measured 24 h later. Only those groups that had been injected into the nigra and trained with 0.2 mA showed amnesia. These results support the hypotheses that (a) the normal activity of a set of structures is essential for the development of memory consolidation and (b) after an enhanced learning experience these structures may participate in memory consolidation, but are not necessary for the occurrence of this process.     

Implicit learning shapes new conscious percepts and representations

We present here the lineaments of a new account of implicit learning, an account that does not rely on the notion of “implicit knowledge.” In this account, improved performance depends on the action of unconscious mechanisms that structure the phenomenal, conscious experience of the world. This integrative view makes groundless the search for dissociations between conscious and unconscious influences that has been at the core of the research on implicit learning and memory. We contrast this view, on the one hand, to Dienes and Berry’s (1997) proposal, which defines implicit learning by analogy with subliminal perception, and, on the other, to Neal and Hesketh’s (1997) episodic account, in which subjective experience is a starting point for inquiry, rather than the phenomenon requiring explanation.     

Information-theoretical error analysis of a form-comparison test]

An attempt has been made to make an error analysis, by both the conventional and information theoretical mode of evaluation, of the results of a forms comparison test used for diagnosing the sensory and optical capacity of differentiating. A total of 423 test subjects were available for this program. Data for the standardization of this test and for the evaluation of test results was derived from the results of this investigation.     

Effects of external cathodal polarization on classical motor conditioning in dogs

The present study was designed to determine the effects of cathodal polarization on the establishment of motor conditional reflexes (CR's), with faradic shock as reinforcement. Ten dogs were used as controls and another seven as experimental subjects (ES's). In the ES's, stainless-steel electrodes were implanted on the face, infraorbitally, for chronic polarization. Four days later the ES's were trained in a soundproof room with classical conditioning procedures while they were co9nstantly polarized with direct current (1 to 2 ma). Control dogs showed strong (+3 and +4) motor CR's within the first 50reinforced trials, with differentiation after 50 trials. In contrast, the ES's showed poor motor conditioning: six ES's showed poor motor CR's in the first 50 reinforced trials. Only one ES showed prompt, good motor CR's. The fact that cathodal polarization interferes with theestablishment of motor CR's suggests an inhibitory effect on the acquisition of musculoskeletal CR's. It is possible that the inhibitory effects observed are related to the depression produced by cathodal polarization in humans.     

Psychological Treatments for Mental Disorders in Children and Adolescents: A Review of the Evidence of Leading International Organizations

In recent decades, the evidence on psychological treatments for children and adolescents has increased considerably. Several organizations have proposed different criteria to evaluate the evidence of psychological treatment in this age group. The aim of this study was to analyze evidence-based treatments drawn from RCTs, reviews, meta-analyses, guides and lists provided by four leading international organizations. The institutions reviewed were the National Institute for Health and Care Excellence, the Society of Clinical Child and Adolescent Psychology (Division 53) of the American Psychological Association, Cochrane Collaboration and the Australian Psychological Society in relation to mental disorders in children and adolescents. A total of 137 treatments were analyzed for 17 mental disorders and compared to determine the level of agreement among the organizations. The results indicate that, in most cases, there is little agreement among organizations and that there are several discrepancies within certain disorders. These results require reflection on the meaning attributed to evidence-based treatments with regard to psychological treatments in children and adolescents. The possible reasons for these differences could be explained by a combination of different issues: the procedures or committees may be biased, different studies were reviewed, different criteria are used by the organizations or the reviews of existing evidence were conducted in different time periods.     

Developing a System for Processing Health Data of Children Using Digitalized Toys: Ethical and Privacy Concerns for the Internet of Things Paradigm

EDUCERE (Ubiquitous Detection Ecosystem to Care and Early Stimulation for Children with Developmental Disorders) is a government funded research and development project. EDUCERE objectives are to investigate, develop, and evaluate innovative solutions for society to detect changes in psychomotor development through the natural interaction of children with toys and everyday objects, and perform stimulation and early attention activities in real environments such as home and school. In the EDUCERE project, an ethical impact assessment is carried out linked to a minors’ data protection rights. Using a specific methodology, the project has achieved some promising results. These include use of a prototype of smart toys to detect development difficulties in children. In addition, privacy protection measures which take into account the security concerns of health data, have been proposed and applied. This latter security framework could be useful in other Internet of Things related projects. It consists of legal and technical measures. Special attention has been placed in the transformation of bulk data such as acceleration and jitter of toys into health data when patterns of atypical development are found. The article describes the different security profiles in which users are classified.