Organization, development and function of complex brain networks

Recent research has revealed general principles in the structural and functional organization of complex networks which are shared by various natural, social and technological systems. This review examines these principles as applied to the organization, development and function of complex brain networks. Specifically, we examine the structural properties of large-scale anatomical and functional brain networks and discuss how they might arise in the course of network growth and rewiring. Moreover, we examine the relationship between the structural substrate of neuroanatomy and more dynamic functional and effective connectivity patterns that underlie human cognition. We suggest that network analysis offers new fundamental insights into global and integrative aspects of brain function, including the origin of flexible and coherent cognitive states within the neural architecture.     

Cognitive bias in dizziness: emotional Stroop and autobiographical memories

Dizziness is commonly associated with anxiety, and is often caused by a dysfunction of the balance system. While a link between dizziness and both anxiety disorders and depression has been established, less is known about information processing in dizziness. In the first experiment we tested whether 15 patients with dizziness would display an emotional Stroop effect for panic-related words. Also included was a control group of 15 persons. The Stroop task was preceded by ratings of personal relevance of the Stroop words and followed by a surprise free recall of the words. Results showed a Stroop effect for panic-related words in the dizziness group, but the interaction did not reach significance (p = 0.08). Separate analysis of dizziness-related panic words however resulted in a significant group x condition interaction. In the free recall of Stroop words a main effect of word category was found, with more panic-related words being recalled. The second experiment investigated autobiographical memories in 14 patients with dizziness and 14 matched controls. Results showed a group x condition interaction with less specific memories being recalled following positive cue-words in the dizziness group. The overall pattern of results suggests that dizziness is related to deficits in information processing, which could be targeted in treatment.     

Don't fear the social relations model: reply to Piper, Ogrodniczuk, Lamarche, and Joyce

By studying actual therapy groups and using a sophisticated design to determine that clients who are held in higher esteem by their fellow group members show greater improvement over the course of therapy, Piper, Ogrodniczuk, Lamarche, and Joyce (this issue) have made a significant contribution to the group psychotherapy literature. Unfortunately, Piper et al. focused much of their discussion on the difficulties they faced using the social relations model (SRM) and the statistical program SOREMO. Although the SRM is not simple and it takes practice to run SOREMO, the analytic alternative proposed by Piper et al. has a number of serious limitations that prevents it from being a viable alternative. There is much to be gained from learning the SRM; for those group therapists and researchers who do not want to learn the SRM, they can always consult or collaborate with SRM researchers.     

Orthographically Influenced Abstract Phonological Representation: Evidence from Non-rhotic Speakers

It is typically assumed that when orthography is translated silently into phonology (i.e., when reading silently), the phonological representation is equivalent to the spoken form or, at least, the surface phonemic form. The research presented here demonstrates that the phonological representation is likely to be more abstract than this, and is orthographically influenced. For example, the claim is made that the word corn has an underlying /r/ in its phonological representation, even in non-rhotic dialects. The evidence comes from difficulties observed in judgements about the homophony with a target word of a pseudohomophone whose phonology does not match the putative abstract representation of that word. For example, it is hard to say that the pseudohomophone cawn is homophonic with corn. The conclusion that orthography can shape phonological representation is antithetical to both computational models of the conversion of print to sound and linguistic accounts of phonology.The research reported in this paper was supported by a grant awarded to the author by the Australian Research Council.     

Sex differences in judgments of physical attractiveness: a social relations analysis

Men and women rated the physical attractiveness of other men and women who were sitting nearby and were rated by them in return. They also provided meta-perceptions of how they thought those others rated them. Attractiveness ratings were partly a function of both the target being rated and the perceiver providing the ratings regardless of the sex of the perceiver or target, but the highest levels of consensus occurred when men judged the attractiveness of women and the highest levels of idiosyncrasy occurred when men rated other men. Meta-perceptions were also idiosyncratic; some believed that they were consistently considered attractive, whereas others thought they were seen as unattractive. People were aware of what others thought of them and, in particular, women's meta-perceptions were highly related to men's judgments of them. People agree about others' attractiveness, and those who are attractive to others know they are pretty or handsome.     

The scope of linguistic generalizations: evidence from Hebrew word formation

Does the productive use of language stem from the manipulation of mental variables (e.g. "noun", "any consonant")? If linguistic constraints appeal to variables, rather than instances (e.g. "dog", "m"), then they should generalize to any representable novel instance, including instances that fall beyond the phonological space of a language. We test this prediction by investigating a constraint on the structure of Hebrew roots. Hebrew frequently exhibits geminates (e.g. ss) in its roots, but it strictly constraints their location: geminates are frequent at the end of the root (e.g. mss), but rare at its beginning (e.g. ssm). Symbolic accounts capture the ban on root-initial geminates as *XXY, where X and Y are variables that stand for any two distinct consonants. If the constraint on root structure appeals to the identity of abstract variables, then speakers should be able to extend it to root geminates with foreign phonemes, including phonemes with foreign feature values. We present findings from three experiments supporting this prediction. These results suggest that a complete account of linguistic processing must incorporate mechanisms for generalization outside the representational space of trained items. Mentally-represented variables would allow speakers to make such generalizations.     

The role of psychoanalytic assessment in the management and care of a psychotic patient

The pressure on mental health services to move patients on quickly, and the emphasis on the recovery model, can encourage a superficial assessment of the patient's difficulties. The author argues that a narrow definition of the medical model based on the presence or absence of symptoms ignores the deeper psychic structures that govern thinking and behaviour over time. A psychoanalytic assessment can offer a dynamic picture of deeper psychic structures in the patient's internal world. This is particularly important with psychotic patients who may successfully use denial and rationalization to cover up their underlying psychopathology. The developmental perspective inherent in the psychoanalytic view can also give a picture of the patient's propensity to repeat certain aspects of his/her psychopathology. In addition, a psychoanalytic approach may shine some light on the relationship between relapse and risk behaviour.