Standardization data of a new 1-min. trisecting test of the RPM Battery are presented. The test is composed of three staggered rows of 10 vertical lines each of variable length. The task is to estimate visually and mark the top third, then to bisect the remainder of as many lines as possible in 1 min. Scores of the first of the two steps, trisection, were shown to be independent of those for the second step, bisection. At least three perceptual illusions are involved in the judgments, and the speed of work influences each differently. All the scores derived for the test correlated only slightly or not at all with other tests of the RPM Battery, or with intelligence, education, or age.
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References
1.
GuilfordJ. P.Psychometric methods. New York: McGraw-Hill, 1954.
2.
HarmanH. H.Modern factor analysis. Chicago: Univer. Chicago Press, 1960.
3.
HumphriesM.Errors in marking the centres of lines, circles, and lenticular figures as a function of size. Percept. mot. Skills, 1960, 11, 67–70.
4.
KuennapasT. M.Visual field interocular differences in the bisection of a line. Acta Psychol., 1958, 14, 375–383.
5.
MefferdR. B.Jr.MoranL. J.KimbleJ. P.Jr.Use of a factor analytic technique in the analysis of long-term repetitive measurements made upon a single schizophrenic patient. Paper presented at Amer. Psychol. Assn National Symposium on Multivariate Analysis of Repeated Measures on the Same Individual, Washington, D. C., 1958.
MoranL. J.MefferdR. B.Jr.KimbleJ. P.Jr.Standardization of psychometric and psychodiagnostic tests for daily measurements in psychopharmacological research. In Transactions of IV Research Conference on Chemotherapy in Psychiatry. Memphis, Tenn.: Dept Med. & Surg., VA, May 20–22, 1959. Pp. 135–138.
12.
MoranL. J.MefferdR. B.Jr.KimbleJ. P.Jr.The objective measurements of psychopathology in longitudinal studies. In Transactions of V Research Conference on Cooperative Chemotherapy Studies in Psychiatry and Research Approaches to Mental Illness. Cincinnati: Dept Med. & Surg., VA, June 6–8, 1960. Pp. 106–112.
13.
PiagetJ.Recherches sur le development des perceptions: XXX. Les comparaisons verticalles a faible intervalles. Arch. Psychol., Geneve, 1956, 33, 289–319.
14.
PiagetJ.MorfA.Note sur la comparaison de lignes perpendiculaires egales. Arch. Psychol., Geneve. 1956, 33, 233–255.
15.
WolfeH. K.On the estimation of the middle of lines. Amer. J. Psychol., 1923, 34, 313–358.
