Effect of time and space uncertainty on a vigilance task

Two groups, each of 12 Ss, were instructed to detect increments in light level from displays of one or five lights. Signals appeared in regular and in irregular intervals. The display was flashed on simultaneously for 0.8 sec every 3.2 sec. Signal detection was superior with a display of one light than with a display of five lights. For two extreme response criteria, there was a decrement of false alarms and an increment of beta during a run. These changes were not dependent upon time and spatial uncertainty. There were no systematic changes in correct detections and d’ during a run. No difference was found between central and peripheral light positions. Correlation of measures was also examined.     

The Structure of Adolescent Affective Well-Being: The Case of the PANAS Among Serbian Adolescents

The structure of affective well-being and the relationship between positive affect (PA) and negative affect (NA) have rarely been examined among adolescents. The aim of the present research was to investigate the question of bipolarity versus independence of PA and NA as measured by the PANAS across three studies in adolescent samples. The results of Study 1 (N = 1038) showed that a two-factor structure of the PANAS, with correlated PA and NA and allowed correlated errors between similarly worded items provided the best fit to data. Study 2 included three independent samples (total N = 1071), and showed that PA and NA differed in terms of their relationship to various well-being indicators. Study 3 (N = 482) tested the predictive validity of PA and NA in a 5 month follow-up design, and showed that both PA and NA had independent predictive benefits for depression, risky behaviors and life satisfaction, and that PA had no unique role in the prediction of stress and anxiety, while NA had no unique role in the prediction of academic achievement. The results of the present research provided strong support for the relative independence of PA and NA as measured by the PANAS among adolescents.     

The relationship between active hand and ear advantage in the native and foreign language

In an experimental design involving two auditorily presented competing commands (one to each ear), 144 right-handed subjects (72 male and 72 female) were asked to provide motor responses. Half of each group of subjects was responding with their right hand and the other half with the left. The test was applied in the subjects' native language (Croatian) and in English, which they had learned as a foreign language. Ear advantage was determined by calculating laterality indices from the order of responding to the commands. On average, right-ear advantage was found in all conditions. Analysis of results revealed the effect of the active hand in Croatian (with significant decrease in the right-ear advantage when using the left hand). The same trend failed to reach significance in English. In responses to English stimuli, there was a significant effect of gender (with men exhibiting a lower right-ear advantage than women). The same trend was not significant for Croatian stimuli. The consistently lower right-ear advantage found in male subjects is contrary to the traditional assumptions that men are more lateralized than women and warrants further investigation.     

Can We Hear Silence?

Philosophia - We can hear silence because silence, an absence of sound, causes our hearing of it. Advocating this position, Roy Sorensen puts to use his own theory of the direct perception of...