I also read it as a qualified positive. (1) Sound and unsound studies can be done in any field. (2) In this examination of the field of psychology, half the obs

I also read it as a qualified positive. (1) Sound and unsound studies can be done in any field. (2) In this examination of the field of psychology, half the observed studies were found to be sound. (3) The implication that half the work in psychology may be unsound is concerning, and suggests a large cohort with problems in rigor, ethics, careerism, etc. (4) The sound work being done in psychology is as sound as the work in other sciences, and it's the unsound work that's the problem. (5) As an interesting side note, unsoundness can be intuited to a statistically significant degree.