Scientific inbreeding and same-team replication: type D personality as an example

Area of Science:

• Psychological Science
• Reproducibility in Science

Background:

• Replication is vital for validating research findings and improving effect size accuracy.
• Certain replication methods, particularly those by the original research team, may inadvertently perpetuate errors.
• Independent replication is key to robust scientific progress.

Purpose of the Study:

• To critically examine different patterns of scientific replication.
• To highlight how certain replication strategies can lead to a false sense of credibility.
• To discuss the implications for psychological science, using specific examples.

Main Methods:

• Conceptual analysis of replication strategies.
• Examination of "obedient replication" and "obliged replication" patterns.
• Case study analysis, including the type D personality and cardiovascular mortality association.

Main Results:

• Replication by the original team can extend, rather than correct, initial errors.
• Independent replication efforts can be compromised if they lack true autonomy.
• "Obedient" and "obliged" replication may offer superficial validation without genuine scientific advancement.

Conclusions:

• The integrity of replication in psychological science requires rigorous independence.
• Researchers must be vigilant against replication patterns that create a spurious sense of credibility.
• Ensuring genuine independence in replication is essential for accurate scientific understanding.