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WE'RE BACK!

October 2025 lilbrary presentations return for another season of lively multi-media presentatioins on "ghost hunting" with from a skeptical viewpoint, including high-tech pseudoscience, skeptical inquiry, critical and thinking pitfalls like cognitive biases. Free admission and open to the pubic. Note: Portions of this presentation may not be suitable for very young audiences.

When and where?

Oct. 21, 6-8pm

Kensington Branch Library

4121 Adams Ave, San Diego, CA 92116

Oct. 28, 5:30-7:30pm

Paradise Hills Branch Library

5922 Rancho Hills Dr, San Diego, CA 92139

honoring the heroes of

skeptical inquiry

Eyewitness Testimony: Many subscribe to the old adage, "Seeing is believing," but eyewitness testimony is among some of the more unreliable findings admitted into any investigation. Paranormal investigations are no exception. Although clients provide personal accounts of activity as part of the Prelim process, investigators cannot use these as findings. Rather, they must depend on a combination of their own personal accounts and the documented findings they capture on the investigation. Even the eyewitness testimony of investigators remains the most subjective and least reliable form of findings in the report. It is significant only if there are correlations between subjective experience and documented findings, or patterns among independent reports of experiences.

click for team bios

EVP: Infrasound, Ultrasound or Something Else?

Over the years there has been a lot of debate regarding the nature of Electronic Voice Phenomena or EVP. One prevailing idea is that EVP is composed of either ultrasonic or infrasonic sound waves, and that is the reason why investigators are unable to hear EVP at the time of capture. Although this is an elegant idea, it is unlikely because it defies the basic understandings of acoustic energy.

PPI Podcast #2: Investigative Techniques (2009)

Part 1 of PPI's presentation: Science and Beyond- An Educated Look at Ghost Hunting, is entitled Investigative Techniques. Presented by PPI Investigator and Case Manager Jason Sieckman.

Recorded March 21, 2009 at Grossmont College, El Cajon, CA

Length: 00:17:12