On the nature of mental disorder: towards an objectivist account

According to the predominant view within contemporary philosophy of psychiatry, mental disorders involve essentially personal and societal values, and thus, the concept of mental disorder cannot, even in principle, be elucidated in a thoroughly objective manner. Several arguments have been adduced in support of this impossibility thesis. My critical examination of two master arguments advanced to this effect by Derek Bolton and Jerome Wakefield, respectively, raises serious doubts about their soundness. Furthermore, I articulate an alternative, thoroughly objective, though in part normative, framework for the elucidation of the concept of mental disorder. The concepts of mental dysfunction and impairment of basic psychological capacities to satisfy one??s basic needs are the building blocks of this framework. I provide an argument for the objective harmfulness of genuine mental disorders as patterns of mental dysfunctions with objectively negative biotic values, as well as a formally correct definition of the concept of mental disorder. Contrary to the received view, this objective framework allows for the possibility of genuine mental disorders due to adverse social conditions, as well as for quasi-universal mental disorders. I conclude that overall, the project of providing an objective account of the concept of mental disorder is far from impossible, and moreover, that it is, at least in principle, feasible.     

Preliminary validation study of the 3-min wrist-worn psychomotor vigilance test

The 10-min psychomotor vigilance test (PVT) is a widely used tool to assess behavioral alertness. In operational environments, however, the 3-min version of the PVT is more practicable. Under controlled laboratory conditions, we compared performance on the 3-min PVT on a wrist-worn device with the 3-min PVT on a laptop computer. We conducted two repeated measures experiments (72 participants) to assess the effects of PVT device type (laptop or wrist-worn), backlight on the wrist-worn device (on or off), ambient light (low or normal levels), and interstimulus interval (ISI). First, we compared the wrist-worn PVT (ISI of 2–10 s) with the laptop-based PVT (ISI of 1–4 s). Participants performed six PVT trials counterbalanced for order of ambient light and device type. In both ambient-lighting conditions, the median differences in PVT metrics (reaction time, response speed, and percentage of 355-ms or 500-ms lapses combined with false starts) between the laptop and the wrist-worn PVT with the backlight on were less than 4.5 %. Specifically, the median difference in reaction times was less than 10 ms. However, the standard deviation in most metrics using the wrist-worn PVT was twice that of the laptop. In a second experiment, we compared the wrist-worn and laptop PVTs with the same ISIs (1–4 s) in normal light conditions. The results suggest that PVT data can be collected reliably in the field using the wrist-worn device with the backlight on and an ISI of 2–10 s.     

A standardized set of 260 pictures for Modern Greek: Norms for name agreement, age of acquisition, and visual complexity

The appropriate selection of both pictorial and linguistic experimental stimuli requires a previous languagespecific standardization process of the materials across different variables. Considering that such normative data have not yet been collected for Modern Greek, in this study normative data for the color version of the Snodgrass and Vanderwart picture set (Rossion & Pourtois, 2004) were collected from 330 native Greek adults. Participants named the pictures (providing name agreement ratings) and rated them for visual complexity and age of acquisition. The obtained measures represent a useful tool for further research on Greek language processing and constitute the first picture normative study for this language. The picture norms from this study and previous ones may be downloaded from brm.psychonomic-journals.org/content/supplemental.     

Comparative study of hostility in depressive patients with and without a suicide attempt history

Hostility in association with depression seems to be connected to suicidal behavior. This study aimed to evaluate hostility and its dimensions in relation to depression in patients who suffered from diagnosed depression with and without a suicide attempt history. The study included 168 participants; 58 patients with depression and suicide attempt history, 55 patients with depression without a suicide attempt history and 55 healthy controls. Hostility was assessed with the Hostility and Direction of Hostility Questionnaire, while depression with the Beck Depression Inventory (BDI). Patients with depression and a suicide attempt history compared with the patients without attempt history presented statistically significantly higher total hostility (28.71 ± 6.43 vs 24.20 ± 7.66), extroverted hostility (17.16 ± 4.37 vs 14.15 ± 4.63), acting out hostility (6.03 ± 2.09 vs 4.73 ± 1.93), and self criticism (6.95 ± 2.12 vs 5.89 ± 2.32). No statistically significant differences were found between the two clinical groups in depression according to the BDI. Moreover depressive patients with suicide attempt history scored higher in all the hostility dimensions than the controls. Therefore, it could be suggested that hostility and especially its extrapunitive dimensions are associated with suicidal behavior, since no differences in depression were recorded between the two clinical groups.     

The hippocampus and memory of verbal and pictorial material

Recognition of words and kaleidoscope pictures showed a double dissociation of left and right hippocampal activity using magnetic source imaging (MSI). MSI has advantages over alternative imaging techniques that measure hemodynamic changes for identifying regional changes in brain activity in real time and on an individual subject basis without the need for image subtraction. In this study, lists of words or kaleidoscope pictures were presented for memorization followed by tests of list items and foils during which brain activity was recorded. There was greater activation in the left than the right hippocampus with abstract nouns (e.g., relief) and greater activation in the right than the left hippocampus with kaleidoscope pictures. This dissociation was evident on a case by case basis. This study demonstrates the specialization of the two medial temporal lobe (MTL) regions, including the hippocampi, for mnemonic processing of verbal and pictorial items that are difficult to encode verbally.     

Effects of individualist and collectivist group norms and choice on intrinsic motivation

Previous research suggests that the positive effect of personal choice on intrinsic motivation is dependent on the extent to which the pervading cultural norm endorses individualism or collectivism (Iyengar and Lepper in J Pers Soc Psychol 76:349–366, 1999). The present study tested effects of personal choice on intrinsic motivation under situationally-induced individualist and collectivist group norms. An organizational role-play scenario was used to manipulate individualist and collectivist group norms in participants from a homogenous cultural background. Participants then completed an anagram task under conditions of personal choice or when the task was either assigned to them by an in-group (company director) or out-group (experimenter) social agent. Consistent with hypotheses, when the group norm prescribed individualism participants in the personal choice condition exhibited greater intrinsic motivation. When the group norm prescribed collectivism, participants’ assigned to the task by the company director were more intrinsically motivated. The implications of results for theories of intrinsic motivation are discussed.     

The effect of navigation method and visual display on distance perception in a large-scale virtual building

Cognitive Processing - Immersive virtual reality (VR) technology has become a popular method for fundamental and applied spatial cognition research. One challenge researchers face is emulating...