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NCJ Number: 65112 Find in a Library
Title: DESCRIPTION AND ANALYSIS OF THE OPERATION AND VALIDITY OF THE PSYCHOLOGICAL STRESS EVALUATOR
Journal: JOURNAL OF FORENSIC SCIENCES  Volume:25  Issue:1  Dated:(JANUARY 1980)  Pages:174-188
Author(s): D H VANDERCAR; J GREANER; N S HIBLER; C D SPIELBERGER; S BLOCH
Corporate Author: American Soc for Testing and Materials
Promotions Manager
United States of America
Date Published: 1980
Page Count: 15
Sponsoring Agency: American Soc for Testing and Materials
West Conhohocken, PA 19428-2959
Institute for Scientific Information
Philadelphia, PA 19104
Sale Source: Institute for Scientific Information
University City Science Ctr
3501 Market Street
Philadelphia, PA 19104
United States of America
Language: English
Country: United States of America
Annotation: A DETAILED DESCRIPTION AND ANALYSIS ARE PRESENTED OF THE PSYCHOLOGICAL STRESS EVALUATOR (PSE), AN INSTRUMENT PURPORTED TO MEASURE ACCURATELY AND TO PORTRAY GRAPHICALLY LEVELS OF STRESS IN HUMAN SPEECH.
Abstract: THE PSE IS A COMPACT, PORTABLE, AUDIO SIGNAL PROCESSOR HOUSED WITHIN A STANDARD 125 MILLIMETER THICK ATTACHE CASE. THIS INSTRUMENT, TYPICALLY USED IN CONJUNCTION WITH A UHER MODEL 4000 TAPE RECORDER, SELECTIVELY FILTERS AND GRAPHICALLY PORTRAYS LOW FREQUENCY COMPONENTS OF SPEECH BELIEVED TO CHANGE DURING PERIODS OF MODERATE TO EXTREME STRESS. A CURVILINEAR TRACING OR 'VOICE CHART' IS FORMED ON HEAT-SENSITIVE PAPER. ACCORDING TO ITS PROPONENTS, THE ADVANTAGES OF PSE ARE NOT ONLY ITS NONINVASIVE CHARACTER BUT IS HIGH DEGREE OF VERSATILITY. IN ONE EXPERIMENT, DESIGNED TO COMPARE PSE WITH MEASURES OF STRESS OBTAINED FROM THE STATE TRAIT ANXIETY INVENTORY (STAI) AND OF HEART RATE UNDER CONDITIONS IN WHICH STRESS WAS EXPERIMENTALLY MANIPULATED THROUGH THREAT OF SHOCK OR THE PRESENTATION OF TABOO WORDS, 60 MALE UNDERGRADUATE VOLUNTEERS WERE RANDOMLY ASSIGNED TO ONE OF THREE EXPERIMENTAL CONDITIONS (SHOCK THREAT, EGO THREAT, AND CONTROL). IN GENERAL, THE PATTERN OF RESULTS OBTAINED FROM THE PSE DATA WAS REMARKABLY SIMILAR TO THE FINDINGS FROM THE STAI A-STATE (PSYCHOLOGICAL STRESS) AND HEART RATE MEASURES. A SECOND EXPERIMENT WAS PERFORMED TO REPLICATE THE FINDINGS OF THE FIRST, PARTICULARLY WITH RESPECT TO ESTABLISHING THE VALIDITY OF THE PSE AS A MEASURE OF HEIGHTENED LEVELS OF A-STATE ANXIETY. THIS STUDY FAILED TO REPLICATE THE VALIDITY OF THE PSE. THIS FAILURE IS ATTRIBUTED TO LOWER LEVELS OF INDUCED STRESS AND A REDUCTION IN BASELINE MEASURES OF STRESS. THE DISCREPANCIES BETWEEN THE PSE RESULTS OF THE TWO EXPERIMENTS POINT TO THE PRESENT LIMITATIONS OF THIS INSTRUMENT. ALTHOUGH THE INSTRUMENT WAS FOUND TO BE EFFECTIVE IN SITUATIONS IN WHICH A LARGE GROUP OF PEOPLE HAD BEEN EXPOSED TO RATHER HIGH LEVELS OF STRESS, IT DOES NOT NECESSARILY FOLLOW THAT THIS INSTRUMENT IS SUFFICIENTLY RELIABLE TO DETECT DECEPTION IN INDIVIDUALS IN MORE NORMAL SETTINGS. GRAPHS AND REFERENCES ARE INCLUDED. (PRG)
Index Term(s): Criminalistics; Evidence identification; Forensic medicine; Police equipment; Psychological stress evaluator; Voice identification
Note: PRICE QUOTED IS FOR ENTIRE ISSUE
To cite this abstract, use the following link:
http://www.ncjrs.gov/App/publications/abstract.aspx?ID=65112

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