RationalWiki's 2020 Fundraiser

There is no RationalWiki without you. We are a small non-profit with no staff – we are hundreds of volunteers who document pseudoscience and crankery around the world every day. We will never allow ads because we must remain independent. We cannot rely on big donors with corresponding big agendas. We are not the largest website around, but we believe we play an important role in defending truth and objectivity.

If everyone who saw this today donated $5, we would meet our goal for 2021.

Fighting pseudoscience isn't free.
We are 100% user-supported! Help and donate $5, $20 or whatever you can today with PayPal Logo.png!

Donations so far: $3500Goal: $3500

Daryl Bem

From RationalWiki
Jump to: navigation, search
Bem speaking at the 1983 Committee for Skeptical Inquiry (CSICOP) conference
Putting the psycho in
Parapsychology
Icon psychic.svg
Men who stare at goats
By the powers of tinfoil

Daryl J. Bem (1938–), a respected social psychologist, is more well known among skeptics for his investigations of the paranormal. His most famous study is titled "Feeling the Future: Experimental Evidence for Anomalous Retroactive Influences on Cognition and Affect",[1] and the most famous subset of these is the "porn" experiment. When provided two hidden images, participants were able to correctly select the "arousing" image 53.1% of the time (more than the 50% predicted by chance). Afterwards, participants were shown which image was porn and which was not. Bem argues that this (and various other tests) constitutes evidence for "retroactive facilitation of recall" — or, people recalling events before they have happened.

However, replication has proven Bem's hypothesis wrong:[2]

Two papers (Galak, LeBoeuf, Nelson, & Simmons, 2012; Ritchie, Wiseman, & French, 2012) have since been published reporting attempts to replicate these experiments. Together these two papers report the results of 10 separate experiments using Bem's methods with a much larger combined sample. Only one of the ten experiments produced a significant result, although the authors (Galak, et al., 2012) report that when the results of their seven experiments were combined the overall effect size was close to zero. Additionally, Galak et al. performed a meta-analysis of all known published and unpublished attempts (comprising over 4,000 participants) to replicate Bem's retroactive facilitation of recall studies. The overall average effect size was not significantly different from zero.

Regardless of whether Bem's original study was designed well (and there are some indeed problems[3]), it has not stood the test of time.

External links[edit]

References[edit]