Reliability Beyond Theory and Into Practice

The critical reactions of Bentler (2009, doi:), Green and Yang (2009a, doi:; 2009b, doi:), and Revelle and Zinbarg (2009, doi:) to Sijtsma’s (2009, doi:) paper on Cronbach’s alpha are addressed. The dissemination of psychometric knowledge among substantive researchers is discussed.     

Hemispheric Asymmetry and Regional Differences in Electroencephalographic Alpha Activity at the Wake-Sleep Transition

Electroencephalographic (EEG) alpha activity at the wake-sleep transition was studied in six right-handed adults in terms of hemispheric asymmetry and regional differences. Twelve-channel EEGs with linked mastoid references were recorded together with horizontal and vertical electro-oculograms (EOGs). Two types of alpha coefficient were obtained every 5.12 s by computing the relative proportion of right vs. left alpha band power and of anterior vs. posterior alpha band power. Four stages were scored using EEG sleep patterns (theta waves, vertex sharp waves, spindles, and K complex) and slow eye movement (SEM): stage W had neither EEG sleep patterns nor SEM; stage D1 had SEM and no EEG sleep patterns; stage D2 had theta waves or vertex sharp waves and SEM; stage S had spindles or K complex without SEM. It was found that the two types of alpha coefficient changed as a function of EEG-EOG stage and were correlated. Right-decreased and anterior-shifted alpha activities were manifest at stages D2 and S. Drowsiness was considered to be a heterogeneous state, exhibiting different spatial changes in alpha activity between stages D1 and D2.     

A generalization of coefficient alpha

It is well known that coefficient alpha can be used to estimate the reliability of a test even when the test is split into several parts. It is also known that alpha can severely underestimate test reliability when the several parts have an unequal number of items. A gernalization of alpha,β _k, is proposed to correct this defect. Several properties ofβ _k are also presented. The author gratefully acknowledges the assistance of Dr. Leonard Feldt for reviewing an earlier draft of this paper, and Ms. Rita Karwacki Bode and Mr. Dave Mansell for the analysis of the experimental data reported here. The comments of an unknown referee which contributed substantially to the clarity of the presentation are also gratefully acknowledged.     

Psychometric properties of the Danish MCMI-I translation

A translation of the MCMI-I has been in use in Denmark for some years. An untested assumption in the interpretation of the pattern of test results is that the psychometric characteristics of the Danish and American versions are similar. The purpose of this study was to evaluate the psychometric properties of the questionnaire by using traditional psychometric analysis techniques on the results of a sample consisting of 423 patients and 179 normal controls. Coefficient alpha was calculated for the 20 clinical subscales of the test and the Danish results were strikingly similar to the original coefficients reported by Millon. Furthermore, factor analysis of the subscales showed a factor structure very similar to American findings, and it is concluded that the psychometric properties of the Danish MCMI are not significantly different from the original.     

What happens before and after acute enactments? An exercise in clinical validation and the broadening of hypotheses

This paper seeks to validate clinical facts and theoretical hypotheses that have been discussed before and that address configurations involving chronic and acute enactments. Its validation process compares clinical material from psychoanalytic work in different psychoanalytic cultures - work from South America-Uruguay (Yardino), Europe-Spain (Sapisochin), South Africa (Ivey), Europe-UK (Bateman). It documents clinical facts described in four articles and confirms that during chronic enactments the analytic dyad gets caught up in a dual relationship that veils and congeals the triangular situation because acknowledging it would be traumatic. The lack of triangular space impedes the formation of symbols as well as dreaming and creates non-dreams-for-two. During chronic enactments analysts use their implicit alpha-function to assemble traumatic areas. These areas emerge as a mix of discharges and non-dreams that are dreamed through acute enactments. Acute enactments occur when chronic enactments dissolve and patients experience an abrupt contact with reality. The attenuated trauma is then dreamed alive. The linking of new symbols develops a network of symbolic thought and creates dreams-for-two and broadens the patient's mental universe. The validation process has deepened our vision concerning clinical facts, especially in relation to: (1) the wavering between acute and chronic enactments, (2) analysts' inhibitions and feelings of guilt, and (3) the influence of analysts' personalities on the configurations they describe. These theoretical hypotheses have been confirmed and broadened not only in relation to the vicissitudes of dream work in traumatic areas, but also in relation to defenses such as thin or thick skin, and in relation to listening in countertransferential detours.     

冥想使人变得平和——人们对正、负性情绪图片的情绪反应可因冥想训练而降低

虽然前人已有不少研究发现冥想具有减少个体焦虑、缓解抑郁水平等功能,并且也已经揭示了冥想促进情绪调节能力的认知神经科学机理,但对于冥想会怎样调制人们对于外部施加的正、负性情绪刺激(图片)的情绪反应尚不清楚,冥想究竟会使人们对外部施加的情绪刺激的敏感性增强还是减弱?如果冥想能够调节和缓解人们的情绪反应的话,那么,这种调节作用是“双向的”(即对正性或负性情绪刺激能产生具有不同效价方向的调节作用)还是“单向的”(即对正性或负性情绪刺激产生具有相同效价方向的调节作用)?为了检验和回答上述问题,本研究以无冥想(或相关)经验的大学生为被试,通过随机实验组、控制组前后测的实验设计,考察了冥想训练能否影响被试对于正、负性情绪图片的情绪唤起.62名大学生被试被随机分配到实验组和控制组(每组31人),实验组参与连续5天、每天20 min的冥想练习,控制组在此期间的控制任务为通常的闭眼休息.结果显示:冥想组在练习过程中的脑α波指数显著升高;与控制组相比,冥想组被试对消极图片的效价评定值显著改善,这表明冥想降低了被试对负性情绪图片的情绪反应,研究还发现了冥想降低被试对正性情绪图片的积极评价倾向,从而证明对外部施加的正、负性情绪刺激而言,冥想训练的调制作用是使人们的情绪反应趋于平和.     

Adolescent anxiety and aggression can be differentially predicted by electrocortical phase reset variables

Increasing evidence supports the notion that both internalizing (e.g., anxiety) and externalizing (e.g., aggression) behavioral dysregulation are associated with abnormal communication between brain regions. Electroencephalographic (EEG) signals across two electrode sites are said to be coherent with one another when they show consistent phase relations. However, periods of desynchrony with shifting of phase relations are a necessary aspect of information processing. The components of EEG phase reset (‘locking’ when two regions remain in synchrony, and ‘shifting’ when the two regions desynchronize momentarily) show dramatic changes across development. We collected resting EEG data from typically developing 12 to 15-year-olds and calculated phase shift and lock values in the alpha frequency band across 14 pairs of electrodes varying in inter-electrode distance. A composite measure of participants’ aggression levels was positively associated with phase shifting, particularly in the low alpha frequency range, most strongly over the left hemisphere, consistent with the relatively greater left-prefrontal activity reported in aggressive adults. A composite measure of anxiety levels was positively associated with alpha phase locking at sites over both hemispheres, consistent with changes in connectivity reported during anxious thinking in adults. Associations with anxiety could not be explained by traditional EEG coherence measures and suggest that phase shifting and locking might provide an important non-invasive associate of clinically problematic behavior.     

Effect of Reward Contingency on Intrinsic Motivation

The effects of type of task and type of reward contingency on intrinsic motivation for subsequent task performance were investigated. The sample consisted of 50 young Indian adults. The results showed a significantly greater amount of free choice time spent on a heuristic task rather than an algorithmic task. The verbal measures of intrinsic motivation yielded a significant effect of reward contingency with greater intrinsic motivation under performance-contingent reward, followed by task-contingent and no-reward conditions, respectively. The results support self-determination and competence processes as important mediators of intrinsic motivation.     

Neuroprotective Effects of Testosterone on Regenerating Spinal Cord Motoneurons in Rats

Degeneration in the CNS and peripheral nervous system consists of degradation and phagocytosis of axons and their myelin sheath distal to the site of injury. Testosterone is a gonadal sex steroid hormone that plays an important role in CNS development. One of the lesser-known testosterone actions is neuroprotection. In the present study, the authors investigated the neuroprotectective effect of intracerebral ventricular injection of testosterone on the number of spinal motoneurons after sciatic nerve crush. In all, 32 male Wistar rats were divided to 4 groups (control, compression, compression + castration, compression + testosterone injections; n = 8). Four weeks after compression the lumber segments of spinal cord were sampled, processed, sectioned serially, and stained with toluidine blue (pH = 4.65) by using steriological quantitative technique (physical dissector), the number of alpha motoneurons in the right ventral horns of spinal cord were counted and compared between groups. Statistical analyses showed that testosterone injections (1μl icv, 4 times, 1 week interval between injections) significantly (p < .05) reduced neuronal damage. These results indicated that testosterone has an obvious neuroprotective effect on lumbar spinal motoneurons.     

Validity and reliability of electroencephalographic frontal alpha asymmetry and frontal midline theta as biomarkers for depression

Electroencephalographic (EEG) frontal alpha asymmetry (FAA) and frontal midline (FM) theta have been suggested as biomarkers for depression and anxiety, but have mostly been assessed in small and non‐clinical studies. In a clinical sample of 79 adults with depression (ICD‐10: F32), resting EEG and scales of depression (MADRS) and anxiety (HADS‐A) were measured at intake and after 3 months. FAA and FM theta values were referenced to a normative population database. Internal consistency, test‐retest reliability, and correlations with psychiatric tests were examined. Reliability was sufficient. However, FAA and FM theta values were close to the general population, and correlations with psychiatric tests were mostly small and non‐significant, with the exception of FAA on F7–F8 z‐scores and HADS‐A. We conclude that the validity of FAA and FM theta and therefore their potential as biomarkers for depression and anxiety remain unclear.