Psychological variables in the control of brain-computer interfaces

BCI (Brain-Computer Interface) is a system that allows interaction between the human brain and a computer. It is based on analyzing electroencephalographic signals (EEG) and processing them to generate control commands. The study analyzed the possible influence of psychological variables, such as the imaginative kinesthetic capacity and anxiety, in relation to performance in a BCI. All participants (4 male and 19 female students) completed the questionnaires and carried out a session of BCI to control their EEG signals in a virtual setting of a car along a straight road. The group was divided into two subgroups according to their EEG signals or differential responses obtained in the left-right discrimination. Study results showed no significant differences in cognitive variables of imagination or in anxiety. By comparing the degree of participants' BCI control, a new quantitative parameter for comparing performances and making decisions in signal processing was found. The findings, the ongoing research process to refine the control of a BCI, and the interaction of psychological and computer procedures are discussed.     

Illness Perception Differences Between Russian- and Hebrew-Speaking Israeli Oncology Patients

Illness perception influences health and illness behaviors. This study was designed to estimate illness perception differences between Russian-speaking and Hebrew-speaking Israeli oncology patients. Changes in illness perception associated with time spent in Israel among Russian-speaking patients were also evaluated. Additionally, we evaluated differences in illness perception of patients exposed to Chernobyl’s consequences. A total of 144 oncology patients (77 Hebrew-speaking, 67 Russian-speaking) completed personal data questionnaires and The illness perception questionnaire revised, translated into Russian for this study. Significantly more Russian-speaking oncology patients perceived their illness as chronic and having negative consequences on life (p < .01). Russian-speaking oncology patients tend to have a more negative perception of cancer compared to Hebrew-speaking patients. Time spent in Israel may create more positive perceptions of cancer among these patients. No illness perception differences were found concerning Chernobyl consequences.     

What is the right thing at the right time? Interactions between stages and processes of change among smokers who make a quit attempt.

C. A. Perz, C. C. DiClemente, and J. P. Carbonari (1996) claim support for the transtheoretical model notion that success in smoking cessation involves doing the right thing at the right time: emphasising experiential change processes during the contemplation and preparation stages and shifting to behavioral process activities during action. A key methodological limitation of Perz et al. was their failure to control for stage of change, a measure that has been shown to be predictive of cessation. This study replicates the prospective findings of Perz et al. in a different data set, then controls for stage of change when it is predictive of cessation, and finds that the measures of "appropriate" change process use developed by Perz et al. no longer predict cessation. The authors conclude that stage of change, in particular the distinction between smoking and not smoking, is more important than change process use in predicting cessation outcomes.     

On the Relationship between Subordinates' Compliance to Power Sources and Organisational Attitudes

Social power involves the potential to influence others and is important in explaining organisational outcomes. Based on the assumptions posited in Raven's (1992, 1993) power interaction model, we examined a set of potential antecedents and correlates of power sources. Participating in the study were 232 nurses and 32 supervisors from two municipal hospitals. Nurses and supervisors were asked to complete a battery of questionnaires including demographic items, the Interpersonal Power Inventory, job satisfaction, and organisational commitment. Convergent and discriminate validity of the power inventory yielded satisfactory results. Principal component analyses of the power inventory revealed a two‐factor solution (harsh/soft sources) which was then used for comparison with predictors and outcome data. Among the major findings were the fact that compliance to power sources appears to be contingent on objective and subjective indices of professional distance between supervisors and subordinates, supervisor seniority in the department, and the type of promotion (from without or within department). Job satisfaction was found to be positively related to compliance with soft sources and negatively with harsh sources whereas commitment was positively associated with both.     

Psyche and Cinema: “Go Ask Alice (or Neo); I Think They'll Know”

The Walt Disney version of Alice in Wonderland is a musical animation beginning in a semi-pastoral setting with butterflies, birds, and daisies. Alice is bored with the textual reading of classical history being given by her uptight Victorian sister. Instead, she wants images, pictures in a book. She sees image as world. “In my world, books will have nothing but pictures,” she declares. This thought takes her further into her imagination and the deconstructive realm it creates. “Everything will be what it isn't and not be what it is.” Finally, she looks into a pond and the reflection of a white rabbit dressed in a frock coat passes by. The mirror of the water surface has released an image of the “other,” an animal, difficult to catch and associated with luck, fertility, and the underground. Alice follows the rabbit into a hole and takes a fall, a radical descent into the underworld. She speculates about descending through the earth to the other side and walking around upside down. She finally lands in front of a door with a punning knob that takes three linguistic “turns.” For Alice, it is impassible but not impossible. Stuck and distraught, she finally gets caught up in the flow of her tears, and rides through the door on her stream of consciousness.     

Broca's aphasia, verbs and the mental lexicon

Verb production is notoriously difficult for individuals with Broca's aphasia, both at the word and at the sentence level. An intriguing question is at which level in the speech production these problems arise. The aim of the present study is to identify the functional locus of the impairment that results in verb production deficits in Broca's aphasia. Levelt's (1989) model is used as a theoretical framework for this study. Two experiments have been conducted, one on verb movement and one on verbs with alternating transitivity. The results suggest that the functional impairment in Broca's aphasia should be located in Levelt's "grammatical encoder."     

Similes on the Internet have explanations

We searched the Internet for expressions linking topics, such as crime, and vehicles, such as disease, as similes (crime is like a disease) and as metaphors (crime is a disease). We counted the number of times the expressions were accompanied by explanations (crime is like a disease because it spreads by direct personal influence). Similes were more likely than metaphors to be accompanied by explanations. Similes may be preferred if a writer wants to express an out-of-the-ordinary relation between the topic and the vehicle.     

Self-esteem and cognitive consistency effects on self-other evaluation

Reactions to bogus evaluations of one's self, either positively or negatively discrepant from one's own self-evaluation, were investigated among subjects differing in self-ideal discrepancy. All subjects exhibited greater acceptance of the source of favorable information than the source of unfavorable information, and changed their self-evaluation more toward the favorable than unfavorable position. However, among low self-ideal discrepancy subjects, the change in self-evaluation was accompanied by a similar change in friend evaluation, thereby maintaining their standing in relation to this friend after receiving either positive or negative evaluations. In contrast, high discrepancy subjects downgraded the friend more and upgraded the friend less than themselves, thereby enhancing their relative standing as a result of the feedback. These findings indicated that defensive or self-enhancing effects on self-evaluation processes are determined by self-ideal discrepancy.