[Secondary use of human tissue: consent and better information required]. / Nader gebruik van lichaamsmateriaal: zeggenschap en betere informatie nodig.

Human tissue remaining after diagnostic procedures is important for use in scientific research. This 'secondary use' of tissue is regulated by the Dutch Medical Treatment Contracts Act and the Code of Conduct for Proper Secondary Use of Human Tissue of the Dutch Federation of Biomedical Scientific Societies. Patients have the right to opt-out of further use of their residual tissue, but the procedures for objection and the provision of information involved are not regulated by statute. Dutch patients have a positive attitude to further use of human tissue for other purposes. They prefer, however, a procedure in which they are informed verbally by their health professional about research with residual tissue. The information can be brief and is best provided early in the treatment. Administrative and technical modifications of the current registration systems are necessary to support the opting-out procedure in practice. By taking the preferences of patients into account, trust in medical practice can be maintained.

Ambivalence and information integration in attitudinal judgment.

In three studies we investigated the role of bottom-up information processing in attitudinal judgment. Overall, the results confirm our expectations and show that people are faster in judging attributes underlying their attitude towards the object than in generating or 'computing' their overall attitudinal response. As predicted, respondents who selected more attributes as important to their attitude needed more time to integrate these attributes in order to come to an overall attitudinal response. Moreover, ambivalence was also related to decreased response times of the overall attitudinal response. We argue that the main reason for this is that non-ambivalent attitudes are generally based on evaluatively congruent attributes, while ambivalent attitude-holders need to integrate evaluatively incongruent attributes into an overall judgment. Implications for research on attitude structure and ambivalence are briefly discussed.