By contrast, even with extensive training, pigeons were unable to detect orientation-based structural violations, suggesting that, unlike humans, they did not learn the underlying structural rules. Children's ability to detect violations of a relatively complex rotational rule correlated with age, whereas their ability to detect violations of a simple translational rule did not. Our ASD participants detected pattern violations with the same speed and accuracy as matched controls. All human groups tested, including children and individuals diagnosed with autism spectrum disorder (ASD), were able to detect violations of all production rules tested. We generated visual plane patterns based on rules varying in complexity. We then further explored pattern-parsing abilities in different human groups, and compared them with pigeons. Both spontaneous creative production and subsequent aesthetic ratings show that humans prefer ordered, symmetrical patterns over random patterns. We first examined spontaneous two-dimensional visual pattern production by humans, gathered using a novel touch screen approach. 6 refs., 9 figs., 1 tab.Formal language theory has been extended to two-dimensional patterns, but little is known about two-dimensional pattern perception. The effect of the feed-back control loop on the telescope rms image radius caused by sensor noise will be calculated. Also based on the diagonalized form, a study of noise coupling, equivalent system bandwidth and matrix noise magnification factor will be presented. A verification of the theoretical results will be presented for an actual actuator coupled to a sensor controlled by a one-dimensional version of the ACS software. The results of a one-dimensional simulation, justified by the diagonalized form of the problem, will be presented showing the conditions for stability, the system response to desired changes and the advantages of using feed-forward. Since whiffletree oscillations are expected to occur at frequencies above the bandpass of the more » control system, the assumption is expected to be valid for the purpose of analyzing the stability and response of the ACS under the expected low frequency perturbations. The ACS is a multivariate control loop that can be represented in a diagonalized form, provided that segment actuator motions only excite oscillations in its corresponding whiffletree (tying an actuator to a mirror segment), with no coupling to the other whiffletrees in the same segment mirror. Keck Telescope has as its main function the maintenance of the mirror figure of the 36-segment primary under the changing effects of gravity, temperature, and other low frequency perturbations. The Primary Mirror Active Control System (ACS) of the W. The emulator is programmed in one of the twelve microprocessors of the ACS hardware and the system can function in the emulation mode by an operator command. The functions are parametrized in a way that the operator can change the parameters to adapt the configuration of the emulator to the changes of structure, and to new knowledge of the behavior of the system elements as it is acquired in real tests. The mirror segment hardware has been modeled by taking into account the discrete-time characteristics of the digital controller. The Emulator replaces mirror segment hardware (actuators, sensors and segments) with timed software loops that appear to the rest of the ACS as the real mirror hardware. This paper presents an emulator to test the Segment Alignment Control System of the Keck telescope. The piston displacement and tilt angles of each segment are actively controlled by a digital multiprocessor system that executes the control more » laws. The measurement of the relative position of the segments is carried out by 168 capacitive displacement sensors which provide input to the control system. The attachment of primary mirror to the mirror cell is made through 108 actuators of adjustable length. The primary mirror is a hyperboloid made with a mosaic of 36 segments. Keck Observatory Ten Meter Telescope has a Segment Alignment Control System (ACS) to achieve the necessary optical quality over the primary mirror.
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