Decision making, movement planning and statistical decision theory

We discuss behavioral studies directed at understanding how probability information is represented in motor and economic tasks. By formulating the behavioral tasks in the language of statistical decision theory, we can compare performance in equivalent tasks in different domains. Subjects in traditional economic decision-making tasks often misrepresent the probability of rare events and typically fail to maximize expected gain. By contrast, subjects in mathematically equivalent movement tasks often choose movement strategies that come close to maximizing expected gain. We discuss the implications of these different outcomes, noting the evident differences between the source of uncertainty and how information about uncertainty is acquired in motor and economic tasks.     

Visuotactile apparent motion

This article compares the properties of apparent motion between a light and a touch with apparent motion between either two lights or two touches. Visual and tactile stimulators were attached to the tips of the two index fingers that were held apart at different distances. Subjects rated the quality of apparent motion between each stimulus combination for a range of stimulus onset asynchronies (SOAs). Subjects reported perceiving apparent motion between all three stimulus combinations. For light—light visual apparent motion, the preferred SOA and the direction threshold SOAs increased as the distance between the stimuli increased (consistent with Korte’s third law of apparent motion). Touch—touch apparent motion also obeyed Korte’s third law, but over a smaller range of distances, showing that proprioceptive information concerning the position of the fingers is integrated into the tactile motion system. The threshold and preferred SOAs for visuotactile apparent motion did not vary with distance, suggesting a different mechanism for multimodal apparent motion.     

Young and older adults' strategies in complex arithmetic

Young and older adults solved complex addition problems such as 49 + 56. Verbal protocols, solution times, and percentage errors documented strategy repertoire and strategy selection in young and older participants and age-related differences in complex arithmetic performance. Both young and older adults used a set of 9 strategies to solve complex addition problems, although many older adults used a smaller strategy repertoire. The data also showed age-related differences in strategy execution and strategy selection. We discuss general implications of the present data to further our understanding of complex arithmetic and the role of strategic variations during aging.     

Looking forward, looking back: anticipation is more evocative than retrospection

The results of 5 experiments indicate that people report more intense emotions during anticipation of, than during retrospection about, emotional events that were positive (Thanksgiving Day), negative (annoying noises, menstruation), routine (menstruation), and hypothetical (all-expenses-paid ski vacation). People's tendency to report more intense emotion during anticipation than during retrospection was associated with a slight, but only occasionally significant, tendency for people to expect future emotions to be more intense than they remembered past emotions having been. The greater evocativeness of anticipation than retrospection was also associated with and statistically mediated by participants' tendency to report mentally simulating future emotional events more extensively than they report mentally stimulating past emotional events. The conclusion that anticipation is more evocative than retrospection has implications for research methodology, clinical practice, decision making, and well-being.     

The Influence of Media Coverage on Responses to a Hypothetical Burglary Scenario1

The present study examined whether media coverage was likely to have an effect on burglars' emotional, cognitive, and behavioral responses to the offense. Questionnaires were distributed to 224 male students, who were asked to imagine that they had committed a “burglary under the influence of alcohol.” They were asked to express their thoughts, feelings, and possible actions, both before and after reading a newspaper article about the offense. A multidimensional scaling procedure identified 4 response themes: guilt, fear, forensic awareness, and pride. Two persuasion variables (inducing guilt and a hidden message) were found to have a multifaceted influence on the 4 themes. Implications for police use of the media as well as limitations of the study are discussed.     

Electrophysiological correlates of rapid auditory and linguistic processing in adolescents with specific language impairment

Brief tonal stimuli and spoken sentences were utilized to examine whether adolescents (aged 14;3-18;1) with specific language impairments (SLI) exhibit atypical neural activity for rapid auditory processing of non-linguistic stimuli and linguistic processing of verb-agreement and semantic constraints. Further, we examined whether the behavioral and electrophysiological indices for rapid auditory processing were correlated with those for linguistic processing. Fifteen adolescents with SLI and 15 adolescents with normal language met strict criteria for displaying consistent diagnoses from kindergarten through the eighth grade. The findings provide evidence that auditory processing for non-linguistic stimuli is atypical in a significant number of adolescents with SLI compared to peers with normal language and indicate that reduced efficiency in auditory processing in SLI is more vulnerable to rapid rates (200ms ISI) of stimuli presentation (indexed by reduced accuracy, a tendency for longer RTs, reduced N100 over right anterior sites, and reduced amplitude P300). Many adolescents with SLI displayed reduced behavioral accuracy for detecting verb-agreement violations and semantic anomalies, along with less robust P600s elicited by verb-agreement violations. The results indicate that ERPs elicited by morphosyntactic aspects of language processing are atypical in many adolescents with SLI. Additionally, correlational analyses between behavioral and electrophysiological indices of processing non-linguistic stimuli and verb-agreement violations suggest that the integrity of neural functions for auditory processing may only account for a small proportion of the variance in morphosyntactic processing in some adolescents.     

Comparison of non-suicidal self-injurious behavior and suicide attempts in patients admitted to a psychiatric crisis unit

The aim of the current study was to examine differences in personality, coping skills, and select psychopathology symptoms in psychiatric patients with and without non-suicidal self-injury and/or suicide attempts. We collected data in a sample of 128 psychiatric patients by means of self-report questionnaires measuring self-harm, psychological symptoms, personality and coping skills. Results support a continuum of self-harm such that patients with both non-suicidal self-injury and suicide attempts exhibit significantly greater levels of psychopathology and lower levels of adaptive personality traits and coping skills. The findings point to the clinical importance of making a distinction between non-suicidal self-injury and suicide attempts, and offers additional variables to consider outside of intent when appraising suicide risk.     

Personality prototypes in individuals with compulsive buying based on the Big Five Model

Personality prototypes based on the Big Five factor model were investigated in a treatment-seeking sample of 68 individuals with compulsive buying (CB). Cluster analysis of the NEO Five-Factor Inventory (NEO-FFI) scales yielded two distinct personality clusters. Participants in cluster II scored significantly higher than those in cluster I on neuroticism and lower on the other four personality traits. Subjects in cluster II showed higher severity of CB, lower degree of control over CB symptoms, and were more anxious, interpersonally sensitive and impulsive. Furthermore, cluster II was characterized by higher rates of comorbid anxiety disorders, and cluster B personality disorders. The two personality prototypes did not differ with respect to obsessive-compulsive features. Finally and of considerable clinical significance, participants in cluster II reported lower remission rates after undergoing cognitive-behavioral therapy. Implications of the results for treatment are discussed.