The relati onship betu7ecn the speed of the conduction process and the diameter of an invcrtehrate nerve is well known. However, no satisfactory theory yet exists which correlates this experimentally observed relation (Yrosser, '46). To this end a theoretical investigation of localized propagated mechanical disturbances in the fibers appears worthwhile. I n part, this consideration is prompted ...

Please cite this article in press as: Jensen, A. R. R dx.doi.org/10.1016/j.paid.2012.03.008 This essay describes Rushton’s contribution to examining the nexus of intelligence, race, and genetics, specifically what I termed ‘‘Spearman’s hypothesis’’. It states that Black–White differences are ‘‘most marked in just those [tests] which are known to be saturated with g’’. I (Jensen) had confirmed t...

One of the major goals of sensory neuroscience is to understand how an organism's perceptual abilities relate to the underlying physiology. To this end, we derived equations to estimate the best possible psychophysical discrimination performance, given the properties of the neurons carrying the sensory code.We set up a generic sensory coding model with neurons characterized by their tuning func...

1. This paper reviews Alpern, Rushton & Torii's (1970a-d) derivation of the size of the inhibitory nerve signal arising from after flashes in the metacontrast experiment. 2. Their geometric argument is recast in terms of simple functional equations. This form of argument clearly displays the role of their assumptions in obtaining their main conclusion: nerve signal is linear in intensity over a...

Recent time-intensity data by Rushton (1932) on the sciatic nerve of the frog are shown to provide additional support to the writer's suggestion (1932, a) that integrals of the equation See PDF for Equation where V is the applied voltage, p is the local excitatory process and K and k are constants adequately represent the just effective direct current stimuli when the threshold value of p is ma...

THIS is an attempt to describe the disability in red-green blindness. It is not an account of the physiology of normal colour vision, nor of the abnormality of the cone cells of the retina in red-green blindness, nor of the genetics of the trait. It does not consider total colour blindness, or colour agnosia, or defects in colour memory. It must be remembered however that the trait is borne as ...

Excess genetic material in the form of a small metacentric chromosome, often smaller than a member of the G group, has been reported in a number of cases (Ilberry, Lee, and Winn, 1961; Fr0land, Holst, and Terslev, 1963; Uchida et al, 1964; Taft, Dodge, and Atkins, 1965; Gustavson, Atkins, and Patricks, 1964, Crawfurd and Lele, 1965; Tamburro and Johnson, 1966; Gamstorp, Hfikansson, and Lagergre...

PURPOSE To investigate the functional protective effect of a synthetic (dimethylthiourea, DMTU) and a natural antioxidant (Ginkgo biloba extract, EGb 761) against light-induced retinal degeneration. METHODS Wistar rats were exposed for 24 hours to 1700-lux light after treatment with DMTU or EGb 761. Electroretinograms were recorded before and on day (D)1, D3, D8, D15, D22, and D29 after light...

BACKGROUND Infant necropsies are important for identifying cause of death. Recently issued guidelines have recommended investigations to be performed following sudden unexpected death in infants. AIMS To evaluate the quality and value of infant postmortem reporting. METHODS Postmortem reports from 1994-1996 and 1998-2000 in Ireland were evaluated using the National Sudden Infant Death Regis...

Actas Dermosifiliogr. 2009;100:511-25 524 3. Whiting DA. Structural abnormalities of the hair shaft. J Am Acad Dermatol. 1987;16:1-25. 4. Itin PH, Mattarelli G, Bircher AJ, Zuberbühler E, Guggenheim R. Localized trichorrhexis nodosa. Br J Dermatol. 1992;127:656-7. 5. Smith RA, Ross JS, Bunker CB. Localized trichorrhexis nodosa. Clin Exp Dermatol. 1994;19:441-2. 6. Ghorpade A. Moustache twirler’...