Bootstrap assessment of the reliability of maxima in surface maps of brain activity of individual subjects derived with electrophysiological and optical methods

Surface maps of brain activity can be obtained with electrophysiological and optical recordings. However, there are no established methods for determining the reliability of maps of brain activity across subject groups or across tasks within the same subject. In this paper, we use bootstrapping to establish the reliability of the locations of maxima in maps of surface brain activity of individual subjects obtained with ERP and optical (EROS) recordings and report sample analyses for two data sets. Bootstrapping is a nonparametric method for estimating statistical accuracy from the data in a single sample. The distribution of the statistic of interest is estimated by constructing “bootstrap samples” from a pool of all available cases (with replacement). Many “bootstrap replications” are obtained by calculating the statistic of interest for each sample. In the case of brain activity, many (e.g., 10,000) amplitude distributions can be derived from the data of an individual subject. Frequency counts are then computed for each recording location to establish how many times that location corresponds to a maximum. The value obtained in this fashion represents an estimate of the reliability of the observation.     

Self-knowledge and scepticism

Donald Davidson has argued that most of our beliefs must be true and that global scepticism is therefore false. Davidson's arguments to this conclusion often seem to depend on externalist considerations. Davidson's position has been criticised, however, on the grounds that he does not defeat the sceptic, but rather already assumes the falsity of scepticism through his appeal to externalism. Indeed, it has been claimed that far from defeating the sceptic Davidson introduces an even more extreme version of scepticism according to which we cannot even know the contents of our own minds. This paper argues that these criticisms are mistaken and that Davidson does indeed have grounds to argue that scepticism is false. The externalism that figures in Davidson's antisceptical arguments is shown to be merely an element in Davidson's overall holism according to which the very possibility of having beliefs that could be true or false depends on most of those beliefs being true and their contents known.     

Provision of leisure activities for the reduction of challenging behavior

Behavioral treatment of challenging behaviors, such as aggression, self-injury, property destruction, and stereotyped movement is often a priority in residential facilities for persons with developmental disabilities. If these behaviors occur when the client is otherwise unengaged, a potentially effective treatment may be to provide alternative activities. In the present study, 3 adults with severe disabilities were observed. During baseline, these 3 individuals frequently displayed challenging behavior at times when they were otherwise unengaged. Opportunities to participate in leisure activities were then provided to each client in a multiple-baseline design. Provision of leisure opportunities was associated with increased adaptive behavior and collateral reductions in problem behaviors. The effectiveness of the intervention procedures suggest that these challenging behaviors may have been related to the lack of alternative activities.     

Case specificity of the stimulus probability effect

Four memory scanning experiments investigated the effect of the probability of occurrence of one case of a letter (e.g., “A”) on response time to the other case of that same letter (“a”). There was no effect: Responses to one case of a letter did not depend on the probability of occurrence of the other case of the letter. This finding indicates that facilitation of visual encoding by high probability of occurrence is not caused by increased activation at the level of the name code. Previous results rule out the possibility that facilitation occurs at the level of feature detectors responding to the individual visual features of the high-probability stimuli, and these results were replicated in the present experiments. It appears that facilitation is caused by activation along specific routes by which visual features activate letter names. This conclusion has implications for the locus of effect of stimulus probability in models of letter coding     

Competence,guilt, and victimization: Sex differences in attribution of causality in television dramas

Sex differences in attribution of causality are investigated in three types of television programs: prime-time family, violent, and daytime serial shows. Both frequency and type of causal statements were studied, using DeCharm's conceptualization of personal causation as origin-like (internal to the self) or pawn-like (external to the self). There were striking sex differences in violent programs, with males modeling more origin behavior and females modeling more pawn behavior. In soap operas there were no sex differences, but both origin and pawn ideas were expressed in terms of personal responsibility, with fewer references to more competent origin behaviors such as goal setting, planned decision making, or self-confidence. These findings have implications for differential socialization of competent coping skills for males and females.The authors would like to express appreciation to Katie Henry and Jennifer Mardoyan, who assisted with this research.     

Gender-based influences: The promotion recommendation

This study used a between-subjects analysis of variance design (2 × 2 × 2 × 2) to estimate the effects of rater gender, ratee gender, the gender stereotype of the job, and the gender stereotype of the ratee's personal characteristics on a promotion decision. The results indicated that female employees with masculine characteristics were evaluated as most promotable regardless of the gender stereotype of the job or the gender of the rater. We also investigated the personal characteristics raters reported using in making their decisions. We asked raters to select ratee personal characteristics that most influenced their promotion decisions. Discriminant analyses showed that male and female raters approached the rating process differently and that it is predominantly the gender stereotype of the ratee's personal characteristics rather than the ratee's gender that influences the promotion process.     

A hot new way to measure aggression: Hot sauce allocation

Laboratory experiments investigating aggressive behavior have operationalized and assessed aggression in a variety of ways; however, these measures are often problematic because they do not create a situation in which participants perceive potential for real harm to come to the target, there is a risk of actual harm to the target, or they are too familiar to participants. To overcome these limitations, we developed a new method for measuring aggression, specifically, the amount of hot sauce administered to a target known to dislike spicy foods. We summarize a series of experiments assessing theory‐based hypotheses regarding aggression in which this measure is employed. We then briefly consider the strengths and limitations of this new measure. Aggr. Behav. 25:331–348, 1999. © 1999 Wiley‐Liss, Inc.     

Living a Lie: Self-Deception, Habit, and Social Roles

In this paper I give an account of self-deception by situating it within the theory of human conduct advanced by American pragmatists John Dewey and George Herbert Mead. After examining and rejecting the two most prevalent explanations of self-deception - namely, Sigmund Freud's psychoanalytic interpretation and Jean-Paul Sartre's phenomenological one - I provide a brief sketch of some of Dewey's and Mead's fundamental insights into the inherently social nature of mind.I argue that one of the main forms of self-deception involves unreflective acceptance of a belief that impartial inspection would readily expose as spurious. In this instance lying to oneself arises from the failure to analyze an appealing idea from the perspective of the generalized other which we acquire through participation in the universe of rational discourse. I conclude by pointing to certain features of contemporary social life that may indirectly promote such self-dissimulation.     

Evil and divine sovereignty

International Journal for Philosophy of Religion - Since at least the tenth century, some theists have argued that God’s sovereignty as creator exempts God from moral evaluation, and so any...     

Presence of administrators differentially impacts eyewitness discriminability for same- and other-race identifications

Best practice guidelines recommend that eyewitness lineup administrators be blind to a suspect's identity, but no research has investigated whether the mere presence of a lineup administrator impacts eyewitness identification decisions. Informed by social facilitation theory, we predicted that the presence of an audience would differentially impact identification accuracy for same- and other-race identifications. Participants (N = 191) viewed same- and other-race lineups either with an audience or alone. Although the presence of an audience did not directly impact identification accuracy, significant indirect effects indicated that the audience provoked evaluation apprehension which hindered other-race identification accuracy and improved same-race identification accuracy. We suggest that using double-blind lineup procedures may not sufficiently protect eyewitness identification accuracy when making other-race lineup decisions in the presence of others.