WITHIN‐TRIAL CONTRAST: WHEN IS A FAILURE TO REPLICATE NOT A TYPE I ERROR?

Vasconcelos, Urcuioli, and Lionello-DeNolf (2007) report the results of five experiments that fail to replicate the results of our within-trial contrast study (Clement, Feltus, Kaiser, & Zentall, 2000) and suggest that our results may represent a Type I Error. We believe that this conclusion is not warranted because (a) there is considerable evidence in support of the effect and (b) the amount of training that they gave to their pigeons prior to test may not have been sufficient to observe the effect reliably. We suggest that when sufficient training is provided, reliable contrast can be found.     

Measuring the combined risk to young children's cognitive development: An alternative to cumulative indices

In studies of child development, the combined effect of multiple risks acting in unison has been represented in a variety of ways. This investigation builds upon this preceding work and presents a new procedure for capturing the combined effect of multiple risks. A representative sample of 2,899 British children had their cognitive development measured at 36 and 58 months of age along with 10 potential risks during this period of development. Comparing a cumulative index of these risks against the previously undocumented alternative of confirmatory factor analysis using formative measurement, this study found differences favouring the factor analysis. The factor analysis procedure demonstrated greater predictive power of children's cognitive development while it systematically tested two of the assumptions implicit in cumulative risk indices.     

Fighting Like Brother and Sister: Sibling Relationships and Future Adult Romantic Relationship Quality

Many factors influence the quality of a romantic relationship, and there has been increasing evidence that early attachment plays a vital role in adult bonds, including romantic relationships. However, most of the literature has focused on the role of parent–child and peer attachments with little focus on sibling attachments. Using the Sibling Relationship Questionnaire, we asked a sample of New Zealand university students to retrospectively rate the relationship they had with a significant sibling during their adolescence, and to rate their current romantic relationship quality using the Relationship Assessment Scale. We found no significant correlations between the subscales of the Sibling Relationship Questionnaire and the Relationship Assessment Scale. However, further analysis uncovered a significant association between the Relationship Assessment Scale, birth order, and relationship length.     

The role played by Gerhard Adler in the development of analytical psychology internationally and in the UK

The Jungian analyst Gerhard Adler left Berlin and re‐settled in London in 1936. He was closely involved with the professionalization of analytical psychology internationally and in the UK, including the formation of the International Association for Analytical Psychology (IAAP) and The Society of Analytical Psychology (SAP).The tensions that arose within the latter organization led to a split that ended in the formation of the Association of Jungian Analysts (AJA). A further split at AJA resulted in the creation of another organization, the Independent Group of Analytical Psychologists (IGAP). Adler's extensive publications include his role as an editor of Jung's Collected Works and as editor of the C.G. Jung Letters.