The reproducibility of psychological experiments on which the foundations of modern psychology is built upon is pathetically low. This undermines most modern treatments and assumptions of why people act like they do and why that is. Looking at random papers in different fields from time to time I often am stunned by how inaccurate, how low the tests groups are and how unscientific the psychology papers are. The potential saving grace which hopeful will rise from the carcass of this travesty of science that is psychology is neuropsychology.
"Despite the care taken to reproduce the experiments exactly, more than half of the studies failed to replicate. When the effects were replicated, they tended to be smaller or weaker than those of the original study. On the other hand, correlational tests showed that when the original studies had lower original p values or larger effect sizes, they were more likely to be replicated.
Nosek and his co-authors attribute the reproducibility problem, in part, to a combination of publication bias and low-power research designs. Publications favor flashy, positive results, making it more likely that studies with larger-than-life effect sizes are chosen for publication."
See ->https://osf.io/ezcuj/wiki/home/
Or just google: The Reproducibility Project: Psychology