Two experiments were conducted to explore the ability of human observers to discriminate the spatial frequency of briefly-presented, Gaussian-truncated sinewave gratings. In the first experiment, the influence of stimulus contrast and stimulus bandwidth on discrimination thresholds was measured after removing any position cues by randomizing the spatial phase of the gratings for each presentati...

INTRODUCTION The performance of auditory steady state response (ASSR) in threshold testing when recorded ipsilaterally and contralaterally, as well as at low and high modulation frequencies (MFs), has not been systematically studied. OBJECTIVE To verify the influences of mode of recording (ipsilateral vs. contralateral) and modulation frequency (40Hz vs. 90Hz) on ASSR thresholds. METHODS Fi...

BACKGROUND Outcomes with hearing aids (HAs) can be assessed using various speech tests, but many tests are not sensitive to changes in high-frequency audibility. PURPOSE A Phoneme Perception Test (PPT), designed for the phonemes /s/ and /ʃ/, has been developed to investigate whether detection and recognition tasks are able to measure individual differences in phoneme audibility and recognitio...

BACKGROUND The purpose of our study was to investigate the association between polycystic ovary syndrome (PCOS) and hearing thresholds. MATERIAL AND METHODS Forty women diagnosed with PCOS (mean age, 24.33±6.38 years) and 40 healthy women controls (mean age, 26.38±6.75 years) were included in prospective study. Each case was tested with low (250, 500, 1000, and 2000 Hz), high (4000, 6000, and 8...

the purpose of this research is to analyze heat waves characteristics in the warm period of the year as a climatic hazard in iran. in this study, the daily maximum temperature is taken at 44 synoptic stations during the period 1981-2010. these temperature values were used to extract the intensity, frequency and duration of heat waves using percentile thresholds of 90, 95, and 98. the results sh...