Gender differences favoring women have been found in face recognition, and in addition to this, it has been shown that women remember more female than male faces. This own-gender effect may be a result of women directing more attention towards female faces, resulting in a better memory. The aim of this study was to assess the role of attention for gender differences in face recognition and women’s own-gender bias by dividing attention at encoding of faces. Thirty-two participants completed two recognition conditions: one where faces at presentation were fully attended and one where a second task was performed simultaneously. Women remembered more female faces than men did when encoded under full attention. This difference disappeared when attention was divided. Less attentional resources might have hindered women from using their assumed expertise processing of faces.

This thesis first examines the determinants of earnings management in an international setting using the Limited Investor Attention Model of Hirshleifer and Teoh (2003). The model predicts that investor attention reduces earnings management. I have four key findings. First, I document that financial analysts curb adjusted absolute abnormal accruals and absolute performance-matched abnormal accruals in global firms. Second, I document that institutional block-holdings curb adjusted absolute abnormal accruals across the world. Third, I document that analyst following is related to more reduction in earnings management in common law countries than in code-law countries. Fourth, I find that institutional block-holders are more effective monitors in common law countries than in code law countries. This thesis also examines the relation between investor attention and stock mispricing of abnormal accruals in an international setting using the Limited Investor Attention Model of Hirshleifer and Teoh (2003). Consistent with the model’s hypothesis that investor attention reduces stock mispricing, I document three key findings. First, I find a significant and negative correlation between stock mispricing and analyst following in global firms. Second, stock mispricing is negatively correlated with institutional ownership in U.S. firms. Stock mispricing is not significantly correlated with institutional block-holdings in global firms. Third, stock mispricing per dollar of abnormal accrual is decreasing in analyst following for sufficiently large abnormal accruals in U.S. and global firms.

Magnetoencephalography was used to investigate the effect of directed attention on changes in sensorimotor mu (8-12Hz) response (mu reactivity) to non-painful electrical stimulation of the median nerve in healthy adults. Results indicated attention-related sex differences in mu reactivity, with females showing i) prolonged mu suppression when attending to somatosensory stimuli indicating active processing of the sensory stimuli; ii) task-dependent attentional modulation of the mu response, which was absent in males, and iii) a trend for greater neuronal excitability of the primary somatosensory region suggesting greater physiological responsiveness to stimulation overall. Sex-related differences in attentional modulation of sensorimotor rhythms suggest that females and males use different top-down control strategies when processing somatosensory information. These sex differences in attention may underlie well-documented sex-related biases in pain processing wherein females typically report greater sensitivity to experimental and clinical pain.

The present study examined the frequency and risk factors associated with experiencing victimization by peers and bullying others in adolescents with Attention-Deficit/Hyperactivity Disorder (ADHD). Sixty-four males and females (ages 13-18) and their parents and teachers completed standardized questionnaires. Adolescents with ADHD were more likely to report increased levels having experienced victimization by peers and participation in bullying others. Parent reports of victimization by peers and bullying others did not differ between adolescents with and without ADHD. Among adolescents with ADHD, those who had experienced victimization by peers perceived lower levels of social support and had increased levels of parent-reported peer relation difficulties. Bullying others was not associated with perceptions of social support or parent-reported peer relation problems. Individual factors such as internalizing problems and oppositionality were not significantly associated with experiencing victimization by peers or bullying others. Implications for future research and clinical assessment are discussed.

Previous work suggests that both concrete (e.g., hat, shoes) and abstract (e.g., god, devil) concepts with spatial associations engage attentional mechanisms, affecting subsequent target processing above or below fixation. Interestingly, both facilitatory and inhibitory effects have been reported to result from compatibility between target location and the meaning of the concept. To determine the conditions for obtaining these disparate effects, we varied the task (detection vs. discrimination), SOA, and concept type (abstract vs. concrete) across a series of experiments. Results suggest that the nature of the concepts underlies the different attentional effects. With abstract concepts, facilitation was observed across tasks and SOAs. With concrete concepts, inhibition was observed during the discrimination task and for short SOAs. Thus, the particular perceptual and metaphorical associations of a concept mediate their subsequent effects on visual target processing.

Magnetoencephalography was used to investigate the effect of directed attention on changes in sensorimotor mu (8-12Hz) response (mu reactivity) to non-painful electrical stimulation of the median nerve in healthy adults. Results indicated attention-related sex differences in mu reactivity, with females showing i) prolonged mu suppression when attending to somatosensory stimuli indicating active processing of the sensory stimuli; ii) task-dependent attentional modulation of the mu response, which was absent in males, and iii) a trend for greater neuronal excitability of the primary somatosensory region suggesting greater physiological responsiveness to stimulation overall. Sex-related differences in attentional modulation of sensorimotor rhythms suggest that females and males use different top-down control strategies when processing somatosensory information. These sex differences in attention may underlie well-documented sex-related biases in pain processing wherein females typically report greater sensitivity to experimental and clinical pain.

The present study examined the frequency and risk factors associated with experiencing victimization by peers and bullying others in adolescents with Attention-Deficit/Hyperactivity Disorder (ADHD). Sixty-four males and females (ages 13-18) and their parents and teachers completed standardized questionnaires. Adolescents with ADHD were more likely to report increased levels having experienced victimization by peers and participation in bullying others. Parent reports of victimization by peers and bullying others did not differ between adolescents with and without ADHD. Among adolescents with ADHD, those who had experienced victimization by peers perceived lower levels of social support and had increased levels of parent-reported peer relation difficulties. Bullying others was not associated with perceptions of social support or parent-reported peer relation problems. Individual factors such as internalizing problems and oppositionality were not significantly associated with experiencing victimization by peers or bullying others. Implications for future research and clinical assessment are discussed.

Previous work suggests that both concrete (e.g., hat, shoes) and abstract (e.g., god, devil) concepts with spatial associations engage attentional mechanisms, affecting subsequent target processing above or below fixation. Interestingly, both facilitatory and inhibitory effects have been reported to result from compatibility between target location and the meaning of the concept. To determine the conditions for obtaining these disparate effects, we varied the task (detection vs. discrimination), SOA, and concept type (abstract vs. concrete) across a series of experiments. Results suggest that the nature of the concepts underlies the different attentional effects. With abstract concepts, facilitation was observed across tasks and SOAs. With concrete concepts, inhibition was observed during the discrimination task and for short SOAs. Thus, the particular perceptual and metaphorical associations of a concept mediate their subsequent effects on visual target processing.

The purpose of this thesis was to determine whether asymmetry in metric and topological spatial judgments could be attributed to the spatial frequency of the stimulus or the size of the attended receptive field. A left hemisphere advantage has been found for topological judgments and a right hemisphere advantage for metric judgments. This asymmetry has been attributed to asymmetrical processing of input conditions, namely size of attended receptive field (called the attentional bin) and spatial frequency of the stimulus. The larger a stimulus, the higher the proportion of low spatial frequencies, so large stimuli are thought to facilitate the extraction of lower spatial frequencies while small stimuli are thought to facilitate the extraction of higher spatial frequencies. A left hemisphere advantage has been reported for high spatial frequencies and small attentional bins and a right hemisphere advantage has been reported for low spatial frequencies and large attentional bins. A method for pitting asymmetrically distributed input conditions against each other using asymmetrically distributed tasks was developed. Three studies were conducted. In the first study, a lack of hemisphere effects suggested bilateral processing of the stimuli. Using an eye tracker, participants were easily able to saccade to the stimulus as was shown in Experiment 2. In Experiment 3, effective exposure duration was reduced so that unilateral viewing was ensured. Under these conditions, bin size and spatial frequency were not dissociable due to a lack of hemisphere effects for spatial frequency and because of task dependency for bin size and spatial frequency processing. Although the assumptions of the double double dissociation were not met, asymmetry in spatial judgments under conditions comparable to those used by Kosslyn et al.(1989) was attributable to a right hemisphere advantage for processing through small attentional bins.

As popularity of online video grows, a number of models of advertising are emerging. It is typically the brokers usually the operators of websites who maintain the balance between content and advertising. Existing approaches focus primarily on personalizing advertisements for viewer segments, with minimal decision-making capacity for individual viewers. We take a resource ownership view on this problem. We view consumers attention space, which can be abstracted as a display screen for an engaged viewer, as precious resource owned by the viewer. Viewers pay for the content they wish to view in dollars, as well as in terms of their attention. Specifically, advertisers may make partial payment for a viewers content, in return for receiving the viewers attention to their advertising. Our approach, named FlexAdSense, is based on CyberOrgs model, which encapsulates distributed owned resources for multi-agent computations.<p> We build a market of viewers attention space in which advertisers can trade, just as viewers can trade in a market of content. We have developed key mechanisms to give viewers flexible control over the display of advertisements in real time. Specific policies needed for automated negotiations can be plugged-in. This approach relaxes the exclusivity of the relationship between advertisers and brokers, and empowers viewers, enhancing their viewing experience.<p> This thesis presents the rationale, design, implementation, and evaluation of FlexAdSense. Feature comparison with existing advertising mechanisms shows how FlexAdSense enables viewers to control with fine-grained flexibility. Experimental results demonstrate the scalability of the approach, as the number of viewers increases. A preliminary analysis of user overhead illustrates minimal attention overhead for viewers as they customize their policies.