Blood flow velocity changes in anterior cerebral arteries during cognitive tasks performance

Objective

Transcranial Doppler sonography (TCD) enables monitoring of blood flow velocities (BFVs) in basal cerebral arteries during different cognitive tasks performance with great temporal resolution. So far, BFVs changes during mental activity were monitored primarily in middle cerebral arteries (MCAs) and little is known about these changes in anterior cerebral arteries (ACAs).

Aim

To determine the effect of different cognitive tasks performance on BFV changes and hemispheric dominance in ACAs and to assess the most suitable activation test for monitoring of BFV changes in ACAs.

Methods

Fourteen right-handed, healthy subjects aged 20–26 were included in the study. BFVs in both ACAs were recorded simultaneously during performance of cognitive tasks designed to activate frontal lobes: phonemic verbal fluency test (pVFT), Stroop tests and Trail Making Tests (TMTs).

Results

A statistically significant BFV increase was recorded in both ACAs during performance of all cognitive tasks. Statistically significant right ACA dominance was found during performance of pVFT and TMTB. The most significant BFV increase was obtained during performance of TMTB.

Conclusion

Our result addressed cognitive tests with great activation potential for monitoring of ACAs that might be used in distinguishing of healthy individuals and patients with neurovascular or neurodegenerative diseases.     

Visual masking and RSVP reveal neural competition

A test visual stimulus is harder to recognize when another stimulus is presented in close temporal vicinity; presenting stimuli in close spatial vicinity of a test stimulus reduces its visibility; presenting a stimulus to one eye can render invisible another stimulus presented to the other eye; and perceiving one interpretation of an ambiguous image prevents the simultaneous perception of other visual interpretations. A single, neurophysiological theory, which may be called 'neural competition' might explain all these phenomena: when two alternative neural visual representations co-exist in the brain, they compete against each other.     

Las Casas as Theological Counteroffensive: An Interpretation of Gustavo Gutiérrez's Las Casas: In Search of the Poor of Jesus Christ

Peruvian liberation theologian Gustavo Gutiérrez's massive work, Las Casas: In Search of the Poor of Jesus Christ, should not be read as a defensive or retreating move for liberation theology in the face of two decades of opposition. Rather, it is best understood as a creative and strategic counteroffensive to advance liberation theology in terms that the Vatican can only find difficult to counter. Nevertheless, liberation theology struggles with the difficulty of intellectually justifying itself on nondependency and non-Marxist grounds. In any case, the struggle for the work of liberation in Latin America continues.     

The Role of Psychological Climate in Neutralizing the Effects of Organizational Politics on Work Outcomes

The present study examined the moderating impact of psychological climate on the relationship between perceived organizational politics and both commitment and turnover intent. Data were gathered from 131 restaurant employees who completed surveys at work. Confirmatory factor analysis revealed that a 6-factor conceptualization (supportive management, role clarity, contribution, recognition, self-expression, and challenge) provided the most adequate model representation of the psychological climate construct. Results indicate that politics perceptions interacted with each climate factor (with the exception of challenge) in predicting commitment. Conversely, politics perceptions interacted only with supportive management and self-expression to predict turnover intent. Implications for theoretical development and empirical research in this domain are provided.     

The Nazi Heritage and Gender Identity

This paper explores the impact of Nazi ideas and values from education in Napola schools of the National Socialist regime on the development of gender identity during late childhood and adolescence. Difficulties in this realm are illustrated by means of biographical material from a study performed at the Sigmund-Freud Institut in Frankfurt. In this study, interviews were conducted with former Napola students, their children, and grandchildren. A clinical example focuses on the theme of haircutting typical of Napola trainees and the impact this had on the development of a man's gender identity. The examination of two further generations showed that the haircut played an important role in their lives and caused difficulties in the development of masculinity, as well as femininity.     

FREE YOUR MIND: BUDDHISM,CAUSALITY, AND THE FREE WILL PROBLEM

The problem of free will is associated with a specific and significant kind of control over our actions, which is understood primarily in the sense that we have the freedom to do otherwise or the capacity for self-determination. Is Buddhism compatible with such a conception of free will? The aim of this article is to address three critical issues concerning the free will problem: (1) what role should accounts of physical and neurobiological processes play in discussions of free will? (2) Is a conception of mental autonomy grounded in practices of meditative cultivation compatible with the three cardinal Buddhist doctrines of momentariness, dependent arising, and no-self? (3) Are there enough resources in Buddhism, given its antisubstantialist metaphysics, to account for personal agency, self-control, and moral responsibility?