Figure-ground (FG) segmentation is the separation of visual information into background and foreground objects. In the visual cortex, FG responses are observed in the late stimulus response period, when neurons fire in tonic mode, and are accompanied by a switch in cortical state. When such a switch does not occur, FG segmentation fails. Currently, it is not known what happens in the brain on s...

Visual areas in primates are known to have reciprocal connections. While the feedforward bottom-up processing of visual information has been studied extensively for decades, little is known about the role of the feedback connections. Existing feedback models usually employ hand-coded connections, and do not address how these connections develop. The model described in this paper shows how feedf...

Enhanced detail processing is a characteristic of ASD. However, previous studies could not yet provide a neural explanation of this trait. Since the balance between visual feedforward and feedback processing is probably essential for the character of visual perception, we conjectured that this balance is disturbed in ASD. Using a new texture discrimination task, where surface segregation was va...

A method for pressure control of self-supplied variable displacement axial piston pumps is considered. By analyzing the mathematical model, a crucial part of the nonlinear system is found to be a piecewise linear function. A control strategy composed of an overall feedforward control and a feedback control is given using the smooth hinge function. Compared with current switching feedforward con...

Design rules for optimal feedforward controllers with lead-lag structure in the presence of measurable disturbances are presented. The design rules are based on stable firstorder models with time delays, FOTD, and are optimal in the sense of minimizing the integratedsquared error. The rules are derived for an open-loop setting, considering a step disturbance. This paper also discusses a general...

Recent theories of visual perception propose that feedforward cortical processing enables rapid and automatic object categorizations, yet incorporates a limited amount of detail. Subsequent feedback processing highlights high-resolution representations in early visual areas and provides spatial detail. To verify this hypothesis, we separate the contributions of feedforward and feedback signals ...

The idea of iterative control of batch processes has been discussed in the literature for some time. Many related concepts have been published under the names iterative control, learning control, run-to-run control, and others. This article uses the name iterative learning control (ILC). The main idea of ILC is illustrated in Fig. 1. An ILC controller provides feedforward control input to a pla...

Hierarchical processing is key to understanding vision. The visual system consists of hierarchically organized distinct anatomical areas functionally specialized for processing different aspects of a visual object (Felleman and Van Essen, 1991). These visual areas are interconnected through ascending feedforward projections, descending feedback projections, and projections from neural structure...

This paper proposes a vibration control scheme for an actuated slider dual-stage servo system. The control scheme consists of three components: a basic track-following servo control loop, a feedback vibration damping loop of the voice coil motor (VCM) assembly and a plug-in feedforward vibration compensation loop for the microactuator (MA). A strain sensor located on the surface of the suspensi...