Peabody Picture Vocabulary Test

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The Peabody Picture Vocabulary Test, the 2007 edition of which is known as the PPVT-IV, is an untimed test of receptive vocabulary for Standard American English and is intended to provide a quick estimate of verbal ability and scholastic aptitude. It was developed in 1959 by special education specialists Lloyd M. Dunn and Leota M. Dunn. The current version lists L.M. Dunn and his son D.M. Dunn as authors.[1][2]

Procedure[edit]

The test is given verbally and takes from twenty to thirty minutes to complete. No reading is required by the individual, and scoring is rapid. For its administration, the examiner presents a series of pictures to each person. There are four pictures to a page, and each is numbered. The examiner speaks a word describing one of the pictures and asks the individual to point to or say the number of the picture that the word describes. Item responses can also be made by multiple choice selection depending on the age of the person being tested. The total score can be converted to a percentile rank, mental age, or a standard deviation IQ score. Although desirable, no special training is required to properly administer and score the PPVT-IV. The test publisher recommends that anyone interpreting or explaining the test scores should have knowledge in psychological testing and statistics.

Changes from previous edition[edit]

The national norms of the PPVT-III were extended to include ages 2 to 6 and older ages up to 90 years of age. Th PPVT-IV was developed from adult norms obtained on 828 persons ages 19 to 40 selected to be nationally representative of geographical regions and major occupational groups. No people with handicaps were included in the norm population. Two parallel forms (A and B) can be used for testing and retesting.

Clinical use[edit]

The PPVT-IV provides an estimate of the client's verbal intelligence and has been administered to groups who had reading or speech problems, had intellectual disability, or were emotionally withdrawn. Studies of earlier versions of the test suggested that it tended to underestimate full-scale IQ scores for both intellectually disabled and gifted test-takers. Because the manner of the individual's response to stimulus vocabulary is to point in any fashion to one of four pictures that best fits the stimulus work, these tests also apply to rehabilitation of individuals who have multiple physical impairments, but whose hearing and vision are intact. The PPVT-IV can also be used for assessing the English vocabulary of non-English-speaking individuals and assessing adult verbal ability.

PPVT clinical research publications include thousands of references. To organize PPVT publications into groupings, two different types of database searches for PPVT publications were completed. The first search quarried the American Psychological Association PsycNET. The second search quarried the American Psychological Association PsycINFO.

PsycNET A quarry of PsycNET completed August 3, 2015 contained the key phrase “Peabody Picture Vocabulary Test”. The PsycNET quarry yielded 5,813 results for Any Field: "Peabody Picture Vocabulary Test". The review of the 5,813 publications indicated that some of the publications were located because they used the word “vocabulary” in the title of the publication, or made a reference to the PPVT in the publication. Because over five thousand publications were identified, a refined search of the literature limited to only articles that used the Peabody Picture Vocabulary test in the title was completed.

PsycINFO References A quarry of PsycINFO database completed August 3, 2015 contained the key phrase: "Peabody Picture Vocabulary Test” and Year: “1959 To 2015” located 451 publications. Only publications that used Peabody Picture Vocabulary Test in the title were collected. The 451 PPVT publications from 1959 through 2015 were organized into the following groups: index term to find the article, name of author who published multiple articles, publication type, author affiliation, reference source, age group of individuals who took the test, research methodology used in article, names of specific tests and measures used in the article, and classification of article by topic. Not all of the references with “Peabody Picture Vocabulary Test” in the title would fall within the classifications.

Index Term for PPVT Publications Employing PsycINFO index terms the 451 articles could be classified into the following groups: Peabody Picture Vocabulary Test (325), Intelligence Measures (122), Test Validity (87), Intellectual Development Disorder (74), Elementary School Students (70), Wechsler Intelligence Scale for Children (65), Test Reliability (47), Blacks (46), Test Scores (43), Statistical Validity (41), Vocabulary (37).

Authors who Published Multiple PPVT Articles Of the 451 articles the following authors were listed as having published more than one article on the PPVT: Covin, Theron M. (10), Bracken, Bruce A. (9), Carvajal, Howard (7), Naglieri, Jack A. (7), Allen, Robert M. (5), Argulewicz, Ed N. (5), Dean, Raymond S. (5), Hodapp, Albert F. (4), Prasse, David P. (4), Sattler, Jerome M. (4)

PPVT Author Affiliation Some of the 451 published articles were published by the following institutions: U Wisconsin (11), Emporia State U (8), U Georgia (8), Arizona State U (6), U South Florida (6) , Ball State U (5), Ohio State U (5), St Louis U (5), U Kansas (5), U Miami (5), U Missouri (5) PPVT Publication Type Some of the 451 articles appeared in the following publications type: Journal (388), Peer Reviewed Journal (355), Dissertation Abstract (61), Peer-Reviewed Status-Unknown (33), Book (2), Edited Book (2).

PPVT Reference Source Some of the 451 articles were found in the following publications: Psychological Reports (67), Psychology in the Schools (42), American Journal of Mental Deficiency (30), Perceptual and Motor Skills (30), Journal of Clinical Psychology (24), Journal of Psychoeducational Assessment (13), Educational and Psychological Measurement (12), Journal of School Psychology (9), Language, Speech, and Hearing Services in Schools (8), The Journal of Educational Research (8), Training School Bulletin (6).

Age Group Some of the 451 articles had the following group or groups of subjects: Childhood (birth-12 yrs) (297), School Age (6-12 yrs) (176), Preschool Age (2-5 yrs) (142), Adolescence (13-17 yrs) (72), Adulthood (18 yrs & older) (40), Young Adulthood (18-29 yrs) (11), Thirties (30-39 yrs) (8), Middle Age (40-64 yrs) (6), Aged (65 yrs & older) (4), Infancy (2-23 mo) (4), Neonatal (birth-1 mo) (3)

Methodology used in PPVT reference Some of the 451 articles included the following methodology in their study: Empirical Study (180), Quantitative Study (34), Longitudinal Study (8), Follow-up Study (5), Literature Review (3), Interview (2), Mathematical Model (2), Brain Imaging (1), Prospective Study (1), and Qualitative Study (1).

Names of Specific Tests and Measures used in Articles Some of the 451 articles included the following list of tests in the study: Peabody Picture Vocabulary Test-III (10), Stanford-Binet Intelligence Scale (5), Peabody Picture Vocabulary Test (4), Peabody Picture Vocabulary Test—Revised (3), Expressive Vocabulary Test (2), Kaufman Brief Intelligence Test (2), Lorge Thorndike Intelligence Test (2), Peabody Picture Vocabulary Test—Third Edition (2), Receptive Vocabulary Test (2), Wechsler Intelligence Scale for Children, Third Edition (2), Armed Forces Qualification Test (1).

PsycINFO Classification by Topic Some of the 451 studies received the following topic classification: Educational Measurement (86), Cognitive & Perceptual Development (82), Educational Psychology (72), Developmental Scales & Schedules (66), Psychological & Physical Disorders (60), Clinical Psychological Testing (57), Tests & Testing (26), Developmental Psychology (25), Mental Retardation (22), Psychometrics & Statistics & Methodology (17), and Personality Psychology (13).

E-Assessments Research Due to known validity and reliability coefficients of the PPVT since the early 1970’s, the PPVT provided an instrument against which questions related to mechanized testing systems could be studied. Mechanized testing systems were testing systems which integrated equipment such as slide projectors and tape players to administer the PPVT could be studied. One mechanized testing system employed a Digital Equipment Corporation PDP-12 computer, interfaced with a Universal Digital Controller to control the random access audio system and the slide projector. The PDP-12 was equipped with a Teletype Model 33 and was interfaced with an oscilloscope so that, during PPVT testing, the status readout of the item number and correctness of response of the last item completed to administer the PPVT could be determined.[3]

An e-assessment project published in the mid-1980’s included an examination of both test validity and test reliability of a personal computer administration (Apple II) in contrast to a paper and pencil administration of the Peabody Picture Vocabulary Test-Revised (PPVT-R). During the computer administration the students’ only interaction with an adult occurred when the students were walked from their classroom to the school library where each was lead to a table with the Apple II computer. Each student was informed that the computer would administer the directions. In addition the students were informed that if they would like the directions or word repeated, they should press the space bar on the computer keyboard. The PPVT-R software program verbally administered the test instructions and administered the visual sample test items. After each student met the standard for administering the PPVT-R, the software program followed the PPVT-R standard test instructions, verbally administered the stimulus word while displaying the visual choices. The software administration included offering, when appropriate, verbal praise to the child for correct responses and informing each student when the test was completed.[4]

As computer-human technology improves, future PPVT e-assessments research may include use of visual tracking computer interface such as wearable eye tracking glasses [5][6] so that disabled adults can respond to PPVT test items by scanning the visual field and fixing their eye gaze on the visual item they select( see Eye tracking - Wikipedia).

Future PPVT e-assessment research could integrate the human nervous system with e-administration of the PPVT. The human nervous system e-assessment would involve assessment of the P300 (P3) wave event related potential (ERP) between visual picture test items and the picture word comparing and contrasting the correct paring of the word and picture against incorrect paring of words and pictures. Use of the PPVT with cognitive disabled individuals and their response to the P3 ERP waveform could be used as a measure for the efficacy of various treatments on cognitive function (see P300: Neuroscience – Wikipedia).

Limits[edit]

The test is not useful in its present form for blind and deaf people, but can be useful for people with intellectual disability without modification of the test administration procedure. A possible problem with the test for adults is that the illustrations for about the first fifty items typically feature children, and thus may not be appropriate for adult subjects with intellectual disability.[why?]

References[edit]

Further reading[edit]

External links[edit]