scholarly journals Measuring the difference limen for identification of order of onset for complex auditory stimuli

1996 ◽  
Vol 58 (4) ◽  
pp. 510-526 ◽  
Author(s):  
Richard E. Pastore ◽  
Shannon M. Farrington
Keyword(s):  
Difference Limen ◽  
Auditory Stimuli ◽  
The Difference

The Speed of Auditory Low-Side Suppression

2005 ◽  
Vol 93 (1) ◽  
pp. 201-209 ◽  
Author(s):  
Marcel van der Heijden ◽  
Philip X. Joris
Keyword(s):  
Traveling Wave ◽  
Auditory Nerve ◽  
Control Mechanism ◽  
Gain Control ◽  
Auditory Stimuli ◽  
Integration Time ◽  
The Difference ◽  
Cochlear Gain ◽  
Millisecond Accuracy ◽  
Group Delays

The nonlinear cochlear phenomenon of two-tone suppression is known to be very fast, but precisely how fast is unknown. We studied the timing of low-side suppression in the auditory nerve of the cat using multitone complexes as auditory stimuli. An evalution of the group delays of the responses to these complexes allowed us to measure the timing of the responses with sub-millisecond accuracy for a large number of fibers with characteristic frequencies (CFs) between 2 and 40 kHz. In particular, we measured the delays with which the same below-CF tone complexes affected the response either as an excitor (when presented alone) or as a suppressor (when combined with a CF probe). For CFs <10 kHz, we found that the delay of suppression was larger than the delay of excitation by several hundred microseconds. The difference between the delay of suppression and that of excitation decreased with increasing CF, becoming negligible for CFs >15 kHz. The results are analyzed in terms of traveling-wave delays and a purported cochlear gain control. The data suggest that suppression originates from a gain-control mechanism with an integration time in the order of two cycles of CF.

scholarly journals Study on the Difference Limen for Flicker Values

1992 ◽  
Vol 28 (Supplement) ◽  
pp. 370-371
Author(s):  
Masaharu TAKEDA ◽  
Kaoru SUZUKI ◽  
Yoshio HAYASHI
Keyword(s):  
Difference Limen ◽  
The Difference

scholarly journals Rapid Temporal Recalibration to Audiovisual Asynchrony Occurs Across the Difference in Neural Processing Speed Based on Spatial Frequency

i-Perception ◽  
2020 ◽  
Vol 11 (5) ◽  
pp. 204166952096661
Author(s):  
Yasuhiro Takeshima
Keyword(s):  
Spatial Frequency ◽  
Processing Speed ◽  
Audiovisual Integration ◽  
Auditory Stimuli ◽  
Neural Processing ◽  
Temporal Recalibration ◽  
Synchrony Perception ◽  
The Difference ◽  
The One ◽  
The Brain

Audiovisual integration relies on temporal synchrony between visual and auditory stimuli. The brain rapidly adapts to audiovisual asynchronous events by shifting the timing of subjective synchrony in the direction of the leading modality of the most recent event, a process called rapid temporal recalibration. This phenomenon is the flexible function of audiovisual synchrony perception. Previous studies found that neural processing speed based on spatial frequency (SF) affects the timing of subjective synchrony. This study examined the effects of SF on the rapid temporal recalibration process by discriminating whether the presentation of the visual and auditory stimuli was simultaneous. I compared the magnitudes of the recalibration effect between low and high SF visual stimuli using two techniques. First, I randomly presented each SF accompanied by a tone during one session, then in a second experiment, only a single SF was paired with the tone throughout the one session. The results indicated that rapid recalibration occurred regardless of difference in presented SF between preceding and test trials. The recalibration magnitude did not significantly differ between the SF conditions. These findings confirm that intersensory temporal process is important to produce rapid recalibration and suggest that rapid recalibration can be induced by the simultaneity judgment criterion changes attributed to the low-level temporal information of audiovisual events.

scholarly journals Perstimulatory Shifts in the Difference Limen for Frequency

1969 ◽  
Vol 46 (1A) ◽  
pp. 80-80
Author(s):  
Robert C. Bilger ◽  
Lawrence L. Feth ◽  
Walter H. Jesteadt
Keyword(s):  
Difference Limen ◽  
The Difference

Intraoral Air Pressure Discrimination under Conditions of Experimental Velopharyngeal Insufficiency

2005 ◽  
Vol 42 (3) ◽  
pp. 297-303
Author(s):  
William N. Williams ◽  
Paul W. Wharton ◽  
Martha F. Paulk ◽  
William S. Brown ◽  
Glenn E. Turner ◽  
...  
Keyword(s):  
Pressure Transducer ◽  
Difference Limen ◽  
Air Pressure ◽  
Velopharyngeal Insufficiency ◽  
Hole Size ◽  
Pressure Load ◽  
Nasal Cavities ◽  
The Subject ◽  
Intraoral Air Pressure ◽  
The Difference

Objective This study assessed a single subject's ability to detect the difference limen (DLs) for his self-generated intraoral air pressure while his oral and nasal cavities were experimentally coupled. Method The subject, a 46-year-old man, uses a speech bulb prosthesis to cover an unrepaired cleft of his hard and soft palates. The subject's oral and nasal cavities were experimentally coupled by drilling different size holes through the speech-bulb component of the prosthesis to approximate conditions of velopharyngeal insufficiency. There were four hole-size conditions (10, 15, 20, and 30 mm2), a no-prosthesis condition, and pre- and postbaseline conditions with the prosthesis intact. The subject blew into a tube connected to a pressure transducer and was presented with a series of paired pressure loads. The first pressure load of each pair was the referent (1, 3, or 5 cm H2O), and the second was a preselected comparator load of a different amount. The subject blew into the tube with sufficient force to center the voltage meter's needle at the zero mark. The subject then reported whether the second pressure load required more, less, or equal breath pressure, compared with the referent pressure load of that pair. Results Size of the hole coupling the oral/nasal cavities did not significantly affect the subject's difference limen. Conclusion Experimental coupling of the oral/nasal cavities did not affect this subject's ability to detect differences in his self-generated intraoral air pressure.

scholarly journals Defensive behavior of the invasive alien hornet, Vespa velutina, against color, hair and auditory stimuli of potential aggressors

PeerJ ◽  
2021 ◽  
Vol 9 ◽  
pp. e11249
Author(s):  
Moon Bo Choi ◽  
Eui Jeong Hong ◽  
Ohseok Kwon
Keyword(s):  
Defensive Behavior ◽  
Black Hair ◽  
Auditory Stimuli ◽  
Similar Response ◽  
Vespa Velutina ◽  
Significant Difference ◽  
The Difference ◽  
Precautionary Measures ◽  
Characteristic Features ◽  
Credible Information

Background During recent years, invasion of the yellow-legged hornet (Vespa velutina) has occurred in Europe, Korea and Japan, and stinging accidents often occur as some V. velutina nests are in places where humans can reach them. Misleading information regarding precautionary measures for mitigating wasp attacks has only exacerbated the situation. In this study, we sought to identify appropriate countermeasures by analyzing wasp defensive behavior, with a focus on color, hair and auditory stimuli. Methods Defensive behavior was analyzed using video recordings by creating an experimental frame to attach experimental bundles to nine V. velutina nests in Daegu and Gyeongbuk, South Korea. For the color experiment, eight-color and single-color tests were conducted with bundles of eight colors (black, brown, yellow, green, orange, gray, red and white), and the difference in defensive behavior was tested between black hair/hairless and green hair/black hairless configurations. Results When presented simultaneously with bundles of eight different colors, V. velutina showed the greatest and the longest defensive behavior against the black bundle, followed by brown. A similar response was observed in single-color tests. Furthermore, there was no significant difference in the defensive behavior against black hair and black hairless, but the duration of defensive behavior was longer for black hair. A comparison between green hair and black hairless stimuli indicated that wasps are more sensitive to color than to hair texture. Vespa velutina showed no discernible responses when exposed to selected auditory stimuli (human conversation and loud music). Dark colors and dark hair are characteristic features of potential predators, to which wasps are evolutionarily predisposed, and are accordingly likely to provoke strong defensive responses. The results of this study provide scientifically credible information that can be used to base appropriate precautionary measures against wasp attacks.

scholarly journals Pure tone discrimination with cochlear implants and filter-band spread

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Luise Wagner ◽  
Reyhan Altindal ◽  
Stefan K. Plontke ◽  
Torsten Rahne
Keyword(s):  
Pure Tone ◽  
Difference Limen ◽  
Normal Hearing ◽  
Corner Frequency ◽  
Center Frequency ◽  
Control Group ◽  
Tone Frequency ◽  
Frequency Bands ◽  
The Difference ◽  
Tone Discrimination

AbstractFor many cochlear implant (CI) users, frequency discrimination is still challenging. We studied the effect of frequency differences relative to the electrode frequency bands on pure tone discrimination. A single-center, prospective, controlled, psychoacoustic exploratory study was conducted in a tertiary university referral center. Thirty-four patients with Cochlear Ltd. and MED-EL CIs and 19 age-matched normal-hearing control subjects were included. Two sinusoidal tones were presented with varying frequency differences. The reference tone frequency was chosen according to the center frequency of basal or apical electrodes. Discrimination abilities were psychophysically measured in a three-interval, two-alternative, forced-choice procedure (3I-2AFC) for various CI electrodes. Hit rates were measured, particularly with respect to discrimination abilities at the corner frequency of the electrode frequency-bands. The mean rate of correct decision concerning pitch difference was about 60% for CI users and about 90% for the normal-hearing control group. In CI users, the difference limen was two semitones, while normal-hearing participants detected the difference of one semitone. No influence of the corner frequency of the CI electrodes was found. In CI users, pure tone discrimination seems to be independent of tone positions relative to the corner frequency of the electrode frequency-band. Differences of 2 semitones can be distinguished within one electrode.

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