The cutaneous 'rabbit' illusion affects human primary sensory cortex somatopically

We used functional magnetic resonance imaging (fMRI) to study neural correlates of a robust somatosensory illusion that can dissociate tactile perception from physical stimulation. Repeated rapid stimulation at the wrist, then near the elbow, can create the illusion of touches at intervening locations along the arm, as if a rabbit hopped along it. We examined brain activity in humans using fMRI, with improved spatial resolution, during this version of the classic cutaneous rabbit illusion. As compared with control stimulation at the same skin sites (but in a different order that did not induce the illusion), illusory sequences activated contralateral primary somatosensory cortex, at a somatotopic location corresponding to the filled-in illusory perception on the forearm. Moreover, the amplitude of this somatosensory activation was comparable to that for veridical stimulation including the intervening position on the arm. The illusion additionally activated areas of premotor and prefrontal cortex. These results provide direct evidence that illusory somatosensory percepts can affect primary somatosensory cortex in a manner that corresponds somatotopically to the illusory percept

Final report of hydraulic model study of Green River fish barrier dam fish trap

CER67-68JFR12.August 1967.State Of Wyoming Game And Fish Commission Cheyenne, Wyoming.Prepared for Johnson-Fermelia and Associates Rock Springs, Wyoming

Final report of hydraulic model study : Hansen Supply Canal, stilling basin and Parshall flume

CER65JFR51.November 1965.Includes bibliographical references.Prepared for Northern Colorado Water Conservancy District Loveland, Colorado

Final report of Harvard Gulch flood control project, conduit intake

CER65JFR62.December 1965.Prepared for Wright-McLaughlin Engineers.This report describes a hydraulic model study of the intake to the 12-foot diameter conduit for the Harvard Gulch Flood Control Project, Design of an intake to provide a discharge of about 2100 cfs at an upstream water surface elevation of 128.7, to limit the flow at elevations above 128.7, and to accelerate the water to the uniform flow velocity in the conduit for the large discharges was the primary object of this study. A discharge rating curve for the intake is provided in Fig. 12. Flow conditions through the transition were satisfactory for all discharges. An air went should be provided in the conduit at a distance of 40 feet to 80 feet downstream from the transition, The exact location to be determined from the general location of the intake in relation to Logan Street. Velocity profiles in the conduit indicate that no u usual conditions prevail. The model construction tests and conclusions and recommendations are described in this report

Peculiar mean velocity profiles within a porous bed of an open channel

Peer reviewedPublisher PD

Final report of hydraulic model study of power tunnel penstock manifold: Tarbela Dam Project, Indus River, West Pakistan

CER66JFR-SSK2.January 1966.Prepared for Tippetts-Abbett-McCarthy-Stratton.Includes bibliographical references

Turbulence structure of open channel flows over permeable and impermeable beds : A comparative study

Peer reviewedPublisher PD

Color infrared photography and thermal infrared imagery of selected locations along the Missouri River between Omaha and Blair, Nebraska

CER71-72MMS-JFR 49.June, 1972.Submitted to Department of the Army Omaha District, Corps of Engineers Omaha, Nebraska.Circulating copy deaccessioned 2020