In the United States, an estimated 60 million to 120 million people say they have experienced a sensory sign—such as a familiar scent or a flickering light—believing it to be contact from a deceased relative. The claim stems from the work of Bill and Judy Guggenheim, who catalogued over 2,000 accounts in the 1980s‑1990s,while recent psychiatric research frames the same experiences as grief‑related hallucinations.

Bill and Judy Guggenheim’s 2,000‑Interview Survey of ADC Encounters

The Guggenheims, an independent husband‑and‑wife research team, coined the term “After‑Death Communication” (ADC) after interviewing more than 2,000 individuals who reported direct contact with a departed spirit. Their findings highlighted recurring motifs:sudden perfume or aftershave aromas, vivid dreams featuring the dead, electronics acting erratically, and pets behaving oddly. They extrapolated that roughly 20‑40% of the U.S. population—about 60 million to 120 million people—had at least one such encounter, often triggered by emotional stress or anniversaries of loss.

2020 Schizophrenia Bulletin Review Finds 30‑60% of Bereaved Report Sensory Experiences

A 2020 study in the journal Schizophrenia Bulletin reviewed decades of research and concluded that 30‑60% of grieving individuals describe sensory phenomena they attribute to the deceased. The authors labeled these “bereavement hallucinations,” emphasizing that they are typical psychological reactions rather than evidence of an afterlife. the paper stresses that such experiences help the mind cope, providing comfort without indicating mental illness.

Case Spotlight: Landon Dennis’s Near‑Death Encounter Claims

Landon Dennis, a 37‑year‑old from Utah who survived a traumatic head injury in 2022, told The Mirror that he met his grandfather and niece in a “realm of light” during a near‑death episode. he described recognizing his grandfather thruogh telepathic communication and seeing a purplish glow that matched his niece’s favorite color. Dennis declared, “The one thing I can tell you I know for sure is that there is life after death,” adding a personal testimony to the broader ADC narrative.

Specific ADC Signs That Grievers Cite Most Frequently

The most commonly reported sign, according to the Guggenheims, is the sudden detection of a scent linked to the deceased—such as a favorite perfume, aftershave, or food. Witnesses say the aroma appears briefly, lingers for seconds, and then vanishes, leaving a profound sense of peace. Other frequent reports include a song playing unexpectedly on the radio, a light bulb flickering without cause, and pets reacting to an unseen presence.

Unresolved Questions: Who Is Interpreting the Data, and What Is Missing?

While the Guggenheims estimate up to 120 million ADC cases, the scientific community has not independently verified these numbers, leaving the true prevalence uncertain. Additionally, the 2020 review focused on sensory experiences but did not differentiate between ADC‑type contacts and more mundane grief hallucinations, creating a gap in understanding the specific mechanisms behind the reported signs.

According to the source, the Guggenheims believed the purpose of ADC is to provide comfort, reassurance, and hope, whereas psychologists view the phenomena as normal mourning processes. Both perspectives agree that the emotional impact on the beeaved is significant, even if the underlying cause remains contested.