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We recorded the activity of the right and left descending contralateral movement detectors responding to 10-cm (small) or 20-cm (large) computer-generated spheres approaching along different trajectories in the locust's frontal field of view. In separate experiments we examined the steering responses of tethered flying locusts to identical stimuli. The(More)
List of Figures: 1. Bar graph showing number of paired suspended-sediment concentration values and total suspended solids values of the 3,235 data pairs for selected suspended-sediment concentration ranges .. 8. Boxplot showing variability in results of suspended-sediment concentrations and total suspended solids analytical methods in quality-control water(More)
Many animals must contend with visual cues that provide information about the spatiotemporal dynamics of multiple objects in their environment. Much research has been devoted to understanding how an identified pair of interneurons in the locust, the Descending Contralateral Movement Detectors (DCMDs), respond to objects on an impending collision course.(More)
The lobula giant movement detector (LGMD) and descending contralateral movement detector (DCMD) constitute one motion-sensitive pathway in the locust visual system that is implicated in collision-avoidance behaviors. While this pathway is thought to respond preferentially to objects approaching on a direct collision course, emerging studies suggest the(More)
BACKGROUND Studies examining rapid spine loading have documented the influence of steady-state trunk preloads, and the resulting levels of trunk muscle preactivation, on the control of spine stability. However, the effects of different levels of muscle coactivation, and resulting spine loads, on the response to a perturbation of the externally unloaded(More)
The lobula giant movement detector (LGMD) and its target neuron, the descending contralateral movement detector (DCMD), constitute a motion-sensitive pathway in the locust visual system that responds preferentially to objects approaching on a collision course. LGMD receptive field properties, anisotropic distribution of local retinotopic inputs across the(More)
Front cover. Background photograph shows Little Arkansas River near Sedgwick, Kansas. Inset photograph shows water-quality monitors suspended from bridge and lowered by USGS personnel into the Little Arkansas River near Sedgwick, Kansas (all photographs taken by Patrick Rasmussen, USGS) For more information on the USGS—the Federal source for science about(More)
The quality of historical fluvial-sediment data cannot be taken for granted, based on a review of upper Colorado River basin suspended-sediment discharges, and on an evaluation of the reliability of Total Suspended Solids (TSS) data. Additionally, the quality of future fluvial-sediment data is not assured. Sediment-surrogate technologies, including those(More)
PURPOSE This study was conducted to quantify the normalized amplitudes of the abdominal wall and back extensor musculature during a variety of push-up styles. We also sought to quantify their impact on spinal loading by calculating spinal compression and torque generation in the L4-5 area. METHODS Ten university-age participants, nine males and one(More)
Pretreatment of tissues or whole organisms with high, sublethal temperatures (heat shock) induces thermotolerance to normally lethal temperatures. It is of interest whether heat shock induces protection of neuronal function at normally lethal temperatures by investigating effects of heat shock on the temperature sensitivity of neuronal parameters in the(More)