You are looking at a unique early Astatic model D ceramic microphone from the 's that comes with original Astatic adapter shown. It should be noted that this is a very rare variant of the crystal D as it has a ceramic element. It's actually the only ceramic version I have ever seen in the hundreds of crystal D's I have sold.
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Across the nervous system, certain population spiking patterns are observed far more frequently than others. A hypothesis about this structure is that these collective activity patterns function as population codewords—collective modes—carrying information distinct from that of any single cell. We develop a novel statistical model that decomposes the population response into modes; it predicts the distribution of spiking activity in the ganglion cell population with high accuracy.
Motion anticipation allows the visual system to compensate for the slow speed of phototransduction so that a moving object can be accurately located. This correction is already present in the signal that ganglion cells send from the retina but the biophysical mechanisms underlying this computation are not known. Here we demonstrate that motion anticipation is computed autonomously within the dendritic tree of each ganglion cell and relies on feedforward inhibition.
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Author contributions: J. Although most textbooks assume that ON and OFF visual responses are relatively balanced throughout the visual system, recent studies have identified a pronounced overrepresentation of OFF responses in the cerebral cortex. In this paper, we demonstrate that these two seemingly separate findings are related and caused by a pronounced difference between ON and OFF luminance response functions, which most likely originates in photoreceptors.
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The Astatic Corporation is a commercial audio products manufacturer founded in Youngstown, Ohio in Intwo amateur radio operators, Creed M. Woodworth, W8AHW began experimenting with different types of microphones for their "ham" stations.