Sector:USA/Raudive_EVP_Recordings

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**Incident ID**: INC-1964-RAUD
**Date**: 1960s–early 1970s
**Location**: Riga, Latvia; Pye Records studio (London, England); multiple RF-shielded laboratories (Europe)
**Reporting Agency**: YomiWiki Archive Compilation
**Status**: UNRESOLVED
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## Executive Summary

A series of audio recordings was produced and archived by Konstantin Raudive, a Latvian psychologist, during the 1960s and early 1970s. The recordings were claimed to contain short verbal items of unclear origin, hereafter referred to by the investigator’s term "electronic voice phenomena" (EVP). The research was conducted using three principal recording methodologies (microphone, radio, diode/crystal detector) and with invited observers from engineering and physics disciplines. Sessions were documented in written logs that recorded ambient conditions, equipment layouts, and personnel present.

The project was characterized by procedural controls that were intended to exclude conventional sources of recorded speech: soundproofed environments, RF-shielded laboratories, and constrained circuit designs. Independent identification of discrete verbal items in post-session playback was reported by multiple observers present at playback sessions, including personnel who had not been present during the live recording interval.

A controlled experiment at a commercial recording facility was conducted in which an 18-minute silent recording interval was executed inside a soundproofed room. On playback, over 200 discrete short verbal items were identified on the tape that did not match voices of persons present during the session. That specific result and a separate instance in which an item addressed the principal investigator by a childhood nickname in a private family-language register were found to lack a consistent conventional explanation in the archived investigatory materials.



## Background and Principal Investigator

Konstantin Raudive (b. 1909) was identified in archival material as a Latvian psychologist and academic. The investigator’s interest in anomalous auditory phenomena was recorded as an extension of earlier parapsychological studies conducted in continental Europe. Raudive’s work on EVP was systematized in a 1971 publication titled Breakthrough, which was noted in contemporaneous press and academic summaries as the investigator’s comprehensive account of recorded items and methodology.

Collaborators and consultants were recorded in session logs and correspondence. A physicist identified as Alex Schneider was recorded as involved in the development of a diode/crystal detector technique designed to limit reception to weak signals. Technical personnel from Pye Records (London) and other recording facilities were recorded as present for specific sessions and for playback analysis.


## Experimental Methodologies (Procedural Summary)

Three principal recording methods were documented in the archival corpus:

- **Microphone method**: A microphone was placed inside a room in