Selective Exposure in the Internet Age: The Interaction between Anxiety and Information Utility

The rise of the Internet forces scholars to reevaluate the frequency and nature of political information seeking in the contemporary period. The functionality of the Internet makes passive exposure more difficult, and selective information seeking easier, than in the past. However, people may also use the Internet in a new and directed way—to arm themselves with information to express and defend their views either online or in the real world. The central question we explore in this paper is what explains balanced versus biased information seeking in the era of the Internet? We combine insights from Sears and Freedman (1967 ) with newer work on emotion to predict motivated selectivity: focusing specifically on the interaction between anxiety and information utility. Our central theoretical claim is that anxiety does not simply boost any information seeking; it triggers information seeking that is useful for addressing the problem at hand. Anxiety alone, therefore, does not guarantee a balanced information search. When counterattitudinal information is useful for some reason—for example, to defend their own opinions to others who may disagree—anxious citizens should seek it out. As a consequence, these subjects should learn more specific information about where each candidate stands on the issues. In an experiment we find support for these hypotheses. We conclude that while today's flexible Internet environment may permit selectivity, balanced seeking should still occur under a fairly common set of circumstances.     

Brain oscillations during semantic evaluation of speech

Changes in oscillatory brain activity have been related to perceptual and cognitive processes such as selective attention and memory matching. Here we examined brain oscillations, measured with electroencephalography (EEG), during a semantic speech processing task that required both lexically mediated memory matching and selective attention. Participants listened to nouns spoken in male and female voices, and detected an animate target (p = 20%) in a train of inanimate standards or vice versa. For a control task, subjects listened to the same words and detected a target male voice in standards of a female voice or vice versa. The standard trials of the semantic task showed enhanced upper beta (25–30 Hz) and gamma band (GBA, 30–60 Hz) activity compared to the voice task. Upper beta and GBA enhancement was accompanied by a suppression of alpha (8–12 Hz) and lower to mid beta (13–20 Hz) activity mainly localized to posterior electrodes. Enhancement of phase-locked theta activity peaking near 275 ms also occurred over the midline electrodes. Theta, upper beta, and gamma band enhancement may reflect lexically mediated template matching in auditory memory, whereas the alpha and beta suppression likely indicate increased attentional processes and memory demands.     

From early withdrawal reaction to infant depression: A baby alone does exist

Despite the frequent use of the term and although it is a key notion in evaluation, infant depression remains poorly defined and assessed since the initial work of René Spitz. This paper reviews recent aspects of infant depression related to classification, issues in infancy, attachment disorders, relationship disorders, maternal depression, failure to thrive and protein energy malnutrition. The actual scope of depression might include some aspects of protein energy malnutrition, a frequent and severe disease in tropical and developing countries, and some aspects of failure to thrive as observed in some multi-problem families in western countries. There might be a continuum between withdrawal reaction and infant depression. Withdrawal reaction is observed in various organic or psychopathological conditions, and could be used as an alarm symptom to screen infants in well-baby clinics. Infant depression is difficult to recognize, and delay in its recognition may have important developmental consequences. © 1997 Michigan Association for Infant Mental Health     

Decision making and free will: a neuroscience perspective

A thorough analysis of the question of whether we possess "free will" requires that we take into account the process of exercising that will: that is, the neural mechanisms of decision making. Much of what we know about these mechanisms indicates that decision making is greatly influenced by implicit processes that may not even reach consciousness. Moreover, there exist conditions, for example certain types of brain injury or drug addiction, in which an individual can be said to have a disorder of the will. Examples such as these demonstrate that the idea of freedom of will on which our legal system is based is not supported by the neuroscience of decision making. Using the criminal law as an example, we discuss how new discoveries in neuroscience can serve as a tool for reprioritizing our society's legal intuitions in a way that leads us to a more effective and humane system.     

Relationship between mousekilling and conspecific aggression in the male rat

In order to investigate the relationships between mousekilling and conspecific aggression, behavioral variables of killer and nonkiller rats were compared in a “resident-intruder” paradigm, in resident as well as in intruder animals. The occurrence of offensive items (offensive sideways, attack) was significantly higher in killer rats when they were residents; their corresponding opponents displayed more defensive behaviors. No significant difference in aggressive behaviors was noted when the comparison was done in the intruders. These results and those of previous studies suggest that there is a correlation between mousekilling and intraspecific offensive behaviors. Some similarities in the situations where both behaviors are elicited–eg, introduction of an unfamiliar intruder into a familiar environment–may contribute to the existence of such a correlation and the possibility of common mechanisms underlying both behaviors is discussed.     

Hemispatial neglect and serial order in verbal working memory

Working memory refers to our ability to actively maintain and process a limited amount of information during a brief period of time. Often, not only the information itself but also its serial order is crucial for good task performance. It was recently proposed that serial order is grounded in spatial cognition. Here, we compared performance of a group of right hemisphere-damaged patients with hemispatial neglect to healthy controls in verbal working memory tasks. Participants memorized sequences of consonants at span level and had to judge whether a target consonant belonged to the memorized sequence (item task) or whether a pair of consonants were presented in the same order as in the memorized sequence (order task). In line with this idea that serial order is grounded in spatial cognition, we found that neglect patients made significantly more errors in the order task than in the item task compared to healthy controls. Furthermore, this deficit seemed functionally related to neglect severity and was more frequently observed following right posterior brain damage. Interestingly, this specific impairment for serial order in verbal working memory was not lateralized. We advance the hypotheses of a potential contribution to the deficit of serial order in neglect patients of either or both (1) reduced spatial working memory capacity that enables to keep track of the spatial codes that provide memorized items with a positional context, (2) a spatial compression of these codes in the intact representational space.