The Relationship Between Shape Perception Accuracy and Drawing Ability.

Accurate shape perception is critical for object perception, identification, manipulation, and recreation. Humans are capable of making judgements of both objective (physical) and projective (retinal) shape. Objective judgements benefit from a global approach by incorporating context to overcome the effects of viewing angle on an object’s shape, whereas projective judgements benefit from a local approach to filter out contextual information. Realistic drawing skill requires projective judgements of 3D targets to accurately depict 3D shape on a 2D surface, thus benefiting from a local approach. The current study used a shape perception task that comprehensively tests the effects of context on shape perception, in conjunction with a drawing task and several measures of local processing bias, to show that the perceptual basis of drawing skill in neurotypical adults is not due to a local processing bias but to perceptual flexibility, the ability to process local or global information as needed.

Do faces speak volumes? Social expectations in speech comprehension and evaluation across three age groups

An unresolved issue in social perception concerns the effect of perceived ethnicity on speech processing. Bias-based accounts assume conscious misunderstanding of native speech in the case of a speaker classification as nonnative, resulting in negative ratings and poorer comprehension. In contrast, exemplar models of socially indexed speech perception suggest that such negative effects arise only when a contextual cue to the social identity is misleading, i.e. when ethnicity and speech clash with listeners’ expectations. To address these accounts, and to assess ethnicity effects across different age groups, three non-university populations (N = 172) were primed with photographs of Asian and white European women and asked to repeat and rate utterances spoken in three accents (Korean-accented German, a regional German accent, standard German), all embedded in background noise. In line with exemplar models, repetition accuracy increased when the expected and perceived speech matched, but the effect was limited to the foreign accent, and—at the group level—to teens and older adults. In contrast, Asian speakers received the most negative accent ratings across all accents, consistent with a bias-based view, but group distinctions again came into play here, with the effect most pronounced in older adults, and limited to standard German for teens. Importantly, the effects varied across ages, with younger adults showing no effects of ethnicity in either task. The findings suggest that theoretical contradictions are a consequence of methodological choices, which reflect distinct aspects of social information processing.

Characteristics and impact of impaired emotion processing

Characteristics and impact of impaired emotion processing demonstrates that the experience of sustained negative affect and diminished positive emotions are cardinal symptoms of major depressive disorder (MDD). It explores how patients diagnosed with MDD show reduced approach motivation and increased avoidance motivation and demonstrate a mood-congruent negative processing bias. It deepens our understanding that patients might exhibit an elevated sensitivity to negative feedback and show an altered thinking style referred to as rumination. Importantly, it explains that depressed patients preferentially attend to mood-congruent stimuli, recall more unpleasant memories, and tend to interpret (ambiguous) information in a negative manner. It highlights that emotional-cognitive dysfunctions are closely related information processing and hence impair cognitive performance of MDD patients.

A new adaptive procedure for estimating perceptual thresholds: the effects of observer bias and its correction.

Adaptive threshold estimation procedures sample close to a subject's perceptual threshold by dynamically adapting the stimulation based on the subject's performance. Yet, perceptual thresholds not only depend on the observers' sensory capabilities but also on any bias in terms of their expectations and response preferences, thus distorting the precision of the threshold estimates. Using the framework of signal detection theory (SDT), independent estimates of both, an observer's sensitivity and internal processing bias can be delineated from threshold estimates. While this approach is commonly available for estimation procedures engaging the method of constant stimuli (MCS), correction procedures for adaptive methods (AM) are only scarcely applied. In this article, we introduce a new AM that takes individual biases into account, and that allows for a bias-corrected assessment of subjects' sensitivity. This novel AM is validated with simulations and compared to a typical MCS-procedure, for which the implementation of bias correction has been previously demonstrated. Comparing AM and MCS demonstrates the viability of the presented AM. Besides its feasibility, the results of the simulation reveal both, advantages, and limitations of the proposed AM. The procedure has considerable practical implications, in particular for the design of shaping procedures in sensory training experiments, in which task difficulty has to be constantly adapted to an observer's performance, to improve training efficiency.

Effect of mental resilience of left-behind children on self-esteem and emotional processing bias and social coping styles

BACKGROUND: The long-term separation of parents and children as well as the incomplete family structure affect the mental health development of left-behind children and the formation of healthy personality, good interpersonal relationships and positive coping styles in adulthood. At present, there is insufficient empirical investigations on the mental resilience of left-behind children. OBJECTIVE: It is aimed to understand the mental health of left-behind children and explore the characteristics of mental resilience, self-esteem and emotional processing bias, as well as social coping styles. METHODS: The random sampling method is used to select the left-behind children as the research subject. The general demographic information questionnaire, RSCA (Resilience Scale for Chinese Adolescent), emotional self-rating scale, SES (Self-Esteem Scale), and coping style questionnaire are used for the survey. Also, the experiments on cognitive processing bias effects of self-esteem and emotion are further carried out. RESULTS: There are differences in demographic variables in mental resilience, self-esteem level, emotional level, and social coping styles. The low mental resilience group shows a processing bias towards low praise words, while the high mental resilience group shows a processing bias towards high praise words. At a low level of self-esteem, there is an interaction between mental resilience and self-esteem on low praise words. Mental resilience has a significant effect on the cognitive processing bias of emotion. Under the induction of positive emotions, the high mental resilience group responds significantly more slowly to the negative words than the low mental resilience group. Under the induction of negative emotions, the high mental resilience group responds significantly faster to the negative words than the low mental resilience group. CONCLUSIONS: Promoting the mental health education of left-behind children can start from enhancing positive emotions, reducing negative emotions, developing high self-esteem, and improving mature coping styles.

Neurocognitive processing efficiency for discriminating human non-alarm rather than alarm scream calls

Across many species, scream calls signal the affective significance of events to other agents. Scream calls were often thought to be of generic alarming and fearful nature, to signal potential threats, with instantaneous, involuntary, and accurate recognition by perceivers. However, scream calls are more diverse in their affective signaling nature than being limited to fearfully alarming a threat, and thus the broader sociobiological relevance of various scream types is unclear. Here we used 4 different psychoacoustic, perceptual decision-making, and neuroimaging experiments in humans to demonstrate the existence of at least 6 psychoacoustically distinctive types of scream calls of both alarming and non-alarming nature, rather than there being only screams caused by fear or aggression. Second, based on perceptual and processing sensitivity measures for decision-making during scream recognition, we found that alarm screams (with some exceptions) were overall discriminated the worst, were responded to the slowest, and were associated with a lower perceptual sensitivity for their recognition compared with non-alarm screams. Third, the neural processing of alarm compared with non-alarm screams during an implicit processing task elicited only minimal neural signal and connectivity in perceivers, contrary to the frequent assumption of a threat processing bias of the primate neural system. These findings show that scream calls are more diverse in their signaling and communicative nature in humans than previously assumed, and, in contrast to a commonly observed threat processing bias in perceptual discriminations and neural processes, we found that especially non-alarm screams, and positive screams in particular, seem to have higher efficiency in speeded discriminations and the implicit neural processing of various scream types in humans.

An overview of techniques applied to the extraction of Non-Pollen Palynomorphs, their known taphonomic issues, and recommendations to maximise recovery

This chapter synthesises the most common processing techniques applied to palynomorphs and their known issues. We primarily focus on NPPs, but include studies on pollen grains where the information might be relevant. An overview of recent (2017-2019) NPP publications is used to connect the most common techniques to known taphonomic issues. Finally, general recommendations are made to minimise processing bias and maximise NPP recovery.