Identification of biological neurons using adaptive observers

Change detection performance is influenced by a number of factors, among which is the informativeness of targets. It has not been clarified, yet, whether the highly informative regions have a processing priority as a result of resource deployment from other tasks or whether it results from a better resource management. In this paper, we adopted a change detection paradigm in which thirty participants were randomly assigned to two groups: single (change detection task) and dual task [change detection and a simplified version of the Paced Auditory Serial Oppository Task (PASOT, Gow and Deary in J Clin Exp Neuropsychol 26:723–736, 2004), which implies a verbal effort]. Stimulus informativeness was defined as social relevance, that is, changing targets were people (high relevance) versus objects (low relevance), all other aspects (i.e., salience and position in the scene) kept constant. As hypothesized, data analyses showed a significant main effect of social relevance and task condition, i.e., better change detection performance and lower change detection times for people versus objects and for single than for dual task condition. Interestingly, the PASOT accuracy remained stable across the person versus object trials, thus implying that the better performance with socially relevant targets could not be explained by a resources withdrawal from the secondary task.

Human listeners provide insights into echo features used by dolphins (Tursiops truncatus) to discriminate among objects

Echolocating bottlenose dolphins (Tursiops truncatus) discriminate between objects on the basis of the echoes reflected by the objects. However, it is not clear which echo features are important for object discrimination. To gain insight into the salient features, the authors had a dolphin perform a match-to-sample task and then presented human listeners with echoes from the same objects used in the dolphin's task. In 2 experiments, human listeners performed as well or better than the dolphin at discriminating objects, and they reported the salient acoustic cues. The error patterns of the humans and the dolphin were compared to determine which acoustic features were likely to have been used by the dolphin. The results indicate that the dolphin did not appear to use overall echo amplitude, but that it attended to the pattern of changes in the echoes across different object orientations. Human listeners can quickly identify salient combinations of echo features that permit object discrimination, which can be used to generate hypotheses that can be tested using dolphins as subjects.     

Timing and trajectory in rhythm production

The Wing-Kristofferson movement timing model (A. M. Wing & A. B. Kristofferson, 1973a, 1973b) distinguishes central timer and motor implementation processes. Previous studies have shown that increases in interresponse interval (IRI) variability with mean IRI are due to central timer processes, not motor implementation. The authors examine whether this is true with IRI duration changes in binary rhythm production. Ten participants provided IRI and movement data in bimanual synchronous tapping under equal (isochronous) and alternating (rhythm) interval conditions. Movement trajectory changes were observed with IRI duration (300, 500, or 833 ms) and for 500-ms IRIs produced in rhythm contexts (300/500 ms, 500/833 ms). However, application of the Wing-Kristofferson model showed that duration and context effects on IRI variability were attributable largely to timer processes with relatively little effect on motor processes.     

Unconscious processing embedded in conscious processing: evidence from gaze time on Chinese sentence reading

The current study aims to separate conscious and unconscious behaviors by employing both online and offline measures while the participants were consciously performing a task. Using an eye-movement tracking paradigm, we observed participants' response patterns for distinguishing within-word-boundary and across-word-boundary reverse errors while reading Chinese sentences (also known as the "word inferiority effect"). The results showed that when the participants consciously detected errors, their gaze time for target words associated with across-word-boundary reverse errors was significantly longer than that for targets words associated with within-word-boundary reverse errors. Surprisingly, the same gaze time pattern was found even when the readers were not consciously aware of the reverse errors. The results were statistically robust, providing converging evidence for the feasibility of our experimental paradigm in decoupling offline behaviors and the online, automatic, and unconscious aspects of cognitive processing in reading.     

影响学生学业求助的因素及其有效策略探析

越来越多的学者认为,学业求助是一种重要的自我调控学习策略,对学生的学习具有重要的意义。本文总结了与学业求助有关的影响因素,包括成就目标、自我效能、班级环境和任务难度,并在此基础上探讨了激发学生有效求助的学习策略。     

Avoiding Disappointment or Fulfilling Expectation: A Study of Gender,Academic Achievement,and Family Functioning among Hong Kong Adolescents

This paper explores the relationship between gender, academic achievement, and family functioning in a Chinese cultural background. Primary and secondary school students (n?=?1597) in Hong Kong participated in a survey questionnaire. Two competing hypotheses are derived and empirically tested based on the idea that parents are likely to have higher expectations toward their sons. First, when boys perform well academically, their parents might not feel particularly overjoyed because their sons simply achieved what they were expected to, which would not affect the parents’ attitudes within the family and thus the boys’ perceptions of the family. Second, when parents have such high expectations for their sons, they would feel particularly satisfied when the outcome fulfills their high expectations. The results indicated that boys did well academically to prevent their parents from potential disappointment, whereas parents were actually happier if their daughters overachieve because they have lower initial expectations. Such differences affected parents’ attitudes, family functioning, and thus adolescents’ view of family. The results of this study carry implications for the study of family functioning and parenting among Chinese families. In particular, parents should avoid having gender-based expectations toward their children, which could adversely affect how boys view their family.     

Family Caregiver’s Positive,Negative, and Ambivalent Feelings Towards Stroke Survivors: Association with Psychological Well-Being

Applied Research in Quality of Life - Ambivalence is the simultaneous experience of positive and negative feelings toward a specific person. Recent research suggested ambivalence is negatively...