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The Influence of Methylphenidate on Spontaneous Autonomic Activity and Behavior in Children Diagnosed as Hyperactive (1981)

Porges, Stephen W. ; Bohrer, Robert E. ; Keren, Gideon ; [et al.]

Oxford, UK : Blackwell Publishing Ltd

Psychophysiology 18 (1981), S. 0

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ISSN: 1469-8986

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Medicine , Psychology

Notes: Methylphenidate influenced the spontaneous autonomic activity of children diagnosed as hyperactive. There was dose response related reduction in disruptive classroom behavior monitored by the teacher ratings and a parallel decrease in a component of heart period variability, V, derived via spectral analysis of heart period activity. A low dose of methylphenidate, which has been reported to enhance cognitive performance, selectively increased a measure of respiratory-cardiac coupling, Cw, derived via cross-spectral analysis of respiration and heart period activity. It is hypothesized that Cw may be a quantitative manifestation of brainstem integration and V may be a quantitative estimate of effective vagal tone on the heart.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1469-8986.1981.tb01541.x

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The polyserial correlation coefficient (1982)

Olsson, Ulf ; Drasgow, Fritz ; Dorans, Neil J.

Springer

Psychometrika 47 (1982), S. 337-347

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ISSN: 1860-0980

Keywords: point polyserial correlation ; dichotomous variables ; polychotomous variables ; latent variables

Source: Springer Online Journal Archives 1860-2000

Topics: Psychology

Notes: Abstract The polyserial and point polyserial correlations are discussed as generalizations of the biserial and point biserial correlations. The relationship between the polyserial and point polyserial correlation is derived. The maximum likelihood estimator of the polyserial correlation is compared with a two-step estimator and with a computationally convenient ad hoc estimator. All three estimators perform reasonably well in a Monte Carlo simulation. Some practical applications of the polyserial correlation are described.