The intensity-difference limen for Gaussian-enveloped stimuli as a function of level: Tones and broadband noise

2001 ◽  
Vol 110 (5) ◽  
pp. 2505-2515 ◽  
Author(s):  
Lance Nizami ◽  
Jason F. Reimer ◽  
Walt Jesteadt
Keyword(s):  
Difference Limen ◽  
Broadband Noise ◽  
Intensity Difference

Clinical Application of Intensity Difference Limen

1969 ◽  
Vol 67 (2-6) ◽  
pp. 435-443 ◽  
Author(s):  
F. Harbert ◽  
I. M. Young ◽  
B. G. Weiss
Keyword(s):  
Clinical Application ◽  
Difference Limen ◽  
Intensity Difference

Effects of Intensity and Age on Perception of Accent in Isochronous Sequences of a Snare Drum Timbre

1994 ◽  
Vol 42 (1) ◽  
pp. 36-44
Author(s):  
Kimberly C. Walls
Keyword(s):  
Difference Limen ◽  
Intensity Change ◽  
Intensity Difference ◽  
Musical Expression ◽  
Snare Drum ◽  
Intensity Increment ◽  
The Relationship ◽  
Correct Criterion ◽  
Female Subjects

Musical expression is often dependent upon accentuation, yet there is little research in the perception of dynamic accent in music and its relationship to intensity just noticeable differences (JNDs). This experiment estimated relationships among (a) accent limen (AL), (b) difference limen (DL), and (c) the ages of the nonmusician female subjects (N = 51). The AL was the intensity increment producing 80 % correct criteria in subjects' perceptions of single accented tones embedded xvithin seven-tone isochronous series. The unaccented tones were identical-timbre 87-dB(A) digitally produced snare drum sounds. The DL was the intensity difference in tone pairs that produced a 75% correct criterion. The relationship between AL and DL was not significant [F(1, 48) = 5.505, p = .197]. The relationship between AL and age was significant [F(1, 48) = 5.732, p = .021], suggesting that the amount of intensity change required for perception of intensity accentuation in musical set-I tings (especially by children) should be larger than the DL.

Functional Organization of the Pallid Bat Auditory Cortex: Emphasis on Binaural Organization

2002 ◽  
Vol 87 (1) ◽  
pp. 72-86 ◽  
Author(s):  
Khaleel A. Razak ◽  
Zoltan M. Fuzessery
Keyword(s):  
Auditory Cortex ◽  
Sound Localization ◽  
High Frequency ◽  
Functional Organization ◽  
Low Frequency ◽  
Frequency Region ◽  
Broadband Noise ◽  
Intensity Difference ◽  
Band Pass ◽  
Pallid Bat

This report maps the organization of the primary auditory cortex of the pallid bat in terms of frequency tuning, selectivity for behaviorally relevant sounds, and interaural intensity difference (IID) sensitivity. The pallid bat is unusual in that it localizes terrestrial prey by passively listening to prey-generated noise transients (1–20 kHz), while reserving high-frequency (<30 kHz) echolocation for obstacle avoidance. The functional organization of its auditory cortex reflects the need for specializations in echolocation and passive sound localization. Best frequencies were arranged tonotopically with a general increase in the caudolateral to rostromedial direction. Frequencies between 24 and 32 kHz were under-represented, resulting in hypertrophy of frequencies relevant for prey localization and echolocation. Most neurons (83%) tuned <30 kHz responded preferentially to broadband or band-pass noise over single tones. Most neurons (62%) tuned >30 kHz responded selectively or exclusively to the 60- to 30-kHz downward frequency-modulated (FM) sweep used for echolocation. Within the low-frequency region, neurons were placed in two groups that occurred in two separate clusters: those selective for low- or high-frequency band-pass noise and suppressed by broadband noise, and neurons that showed no preference for band-pass noise over broadband noise. Neurons were organized in homogeneous clusters with respect to their binaural response properties. The distribution of binaural properties differed in the noise- and FM sweep-preferring regions, suggesting task-dependent differences in binaural processing. The low-frequency region was dominated by a large cluster of binaurally inhibited neurons with a smaller cluster of neurons with mixed binaural interactions. The FM sweep-selective region was dominated by neurons with mixed binaural interactions or monaural neurons. Finally, this report describes a cortical substrate for systematic representation of a spatial cue, IIDs, in the low-frequency region. This substrate may underlie a population code for sound localization based on a systematic shift in the distribution of activity across the cortex with sound source location.

scholarly journals Intensity Difference Limen and Recruitment

1970 ◽  
Vol 13 (1) ◽  
pp. 19-24
Author(s):  
Iwao Hosoda
Keyword(s):  
Difference Limen ◽  
Intensity Difference
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