We propose a novel scheme to embed an invisible signature into an image to check image integrity and measure its distortion. The technique is based on the pseudo noise sequences and visual masking eeects. The values of an image are modiied by a pseudo noise signature which is shaped by the perceptual thresholds from masking eeects. The method is robust and can gauge errors accurately up to half...

Schizophrenia patients' perceptual organization abilities were assessed with a psychophysically well-controlled measure of contour integration. Compared with psychiatric and staff controls, schizophrenia patients were less able to detect contours comprising Gabor elements as the detection of these contours relied increasingly on long-range spatial interactions. Impaired task performance was als...

The authors investigated perceptual learning of a novel accent in young and older listeners through measuring speech reception thresholds (SRTs) using speech materials spoken in a novel-unfamiliar-accent. Younger and older listeners adapted to this accent, but older listeners showed poorer comprehension of the accent. Furthermore, perceptual learning differed across groups: The older listeners ...

Four studies are reported which demonstrate that indirectly, loosely related information, otherwise known as conceptual set, modulates object identification. Studies 1A and 1B demonstrate the impact of indirect, nonspecific, non-perceptual, conceptual primes on the interpretation of ambiguous visual figures. Study 2 demonstrates that indirect, conceptual information (category of farm animals) b...

Two experiments were carried out to determine the perceptual mechanism which distinguishes geminate consonants of Japanese by Korean learners of Japanese. The first investigated the categorical perception of Japanese geminate consonants. In this experiment, we carried out a listening test to measure perceptual characteristics by Korean learners. The second was an interview of Korean learners on...

The purpose of this study was to improve the speech processing strategy for cochlear implants (CIs) A speech preprocessing algorithm is presented to improve the speech intelligibility in noise. The algorithm improves the intelligibility by optimally redistributing the speech energy over time and frequency for a perceptual distortion measure, the algorithm is more sensitive to transient regions....

As a fundamental part of our daily lives, visual word processing has received much attention in the psychological literature. Despite the well established advantage of perceiving letters in a word or in a pseudoword over letters alone or in random sequences using accuracy, a comparable effect using response times has been elusive. Some researchers continue to question whether the advantage due ...

Color appearance models provide a powerful tool for achieving a viewing condition independent color representation. However, current color appearance models such as CIECAM97s and CAM97s2 are more complex than previous CIE device independent color spaces, such as CIELAB and CIELUV. Therefore it is important to understand how to correctly measure and set the input parameters. This paper provides ...

The pupil provides a rich, non-invasive measure of the neural bases perception and cognition has been particular value in uncovering role arousal-linked neuromodulation, which alters both cortical processing size. But size is subject to multitude influences, complicates unique interpretation. We measured pupils observers experiencing perceptual multistability—an ever-changing subjective percept...

Introduction: Attention deficit hyperactivity disorder (ADHD) is one of the most common childhood psychiatric disorders which is characterized by poor attention and subsequently lower learning capacities comparing with normal children. The purpose of this study was to compare the effectiveness of neurofeedback and perceptual-motor exercises as two common non-pharmacological treatments on visual...