A Puzzle Concerning Time Perception

A Puzzle concerning Matter and Form

a research concerning “knowledge and reality” in islamic perception

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Some studies concerning perception of isolated vowels

Thc purpose of thcse studics has bccn to examinc thc possibil i t ics of describing the main phonetic quality of vowels in two dimensions, especially in t e r m s of two frequencies. A mapping of the Swedish vowcl space on this two-dimensional planc has bcen established. As mcans of investigation both a matching procedure and identification t e s t s have bcen used. The nature of the above proj...

A curiosum concerning discrete time convolution

It is shown that the discrete time convolution of two absolutely summable nowhere zero sequences may be identically equal to zero. DEVELOPMENT Consider two absolutely summable sequences a = {a,,: n E Z } and b = { b,,: n E Z } of real numbers. Further, assume that the sequences a and b are nowhere zero. Does it follow that the discrete time convolution a * b is nowhere zero? Does it follow that...

Solving the Autism Puzzle a Few Pieces at a Time

In this issue, a pair of studies (Levy et al. and Sanders et al.) identify several de novo copy-number variants that together account for 5%-8% of cases of simplex autism spectrum disorders. These studies suggest that several hundreds of loci are likely to contribute to the complex genetic heterogeneity of this group of disorders. An accompanying study in this issue (Gilman et al.), presents ne...