Temporal Resolution in Normal-Hearing and Hearing-Impaired Listeners Using Frequency-Modulated Stimuli

1992 ◽  
Vol 35 (2) ◽  
pp. 436-442 ◽  
Author(s):  
John P. Madden ◽  
Lawrence L. Feth
Keyword(s):  
Temporal Resolution ◽  
Sound Pressure ◽  
Discrimination Performance ◽  
Frequency Discrimination ◽  
Normal Hearing ◽  
Pressure Level ◽  
Hearing Impaired ◽  
The Other ◽  
The Difference ◽  
The Individual

This study compares the temporal resolution of frequency-modulated sinusoids by normal-hearing and hearing-impaired subjects in a discrimination task. One signal increased linearly by 200 Hz in 50 msec. The other was identical except that its trajectory followed a series of discrete steps. Center frequencies were 500, 1000, 2000, and 4000 Hz. As the number of steps was increased, the duration of the individual steps decreased, and the subjects’ discrimination performance monotonically decreased to chance. It was hypothesized that the listeners could not temporally resolve the trajectory of the step signals at short step durations. At equal sensation levels, and at equal sound pressure levels, temporal resolution was significantly reduced for the impaired subjects. The difference between groups was smaller in the equal sound pressure level condition. Performance was much poorer at 4000 Hz than at the other test frequencies in all conditions because of poorer frequency discrimination at that frequency.

Frequency Discrimination of Short- versus Long-Duration Tones by Normal and Hearing-Impaired Listeners

1987 ◽  
Vol 30 (1) ◽  
pp. 28-36 ◽  
Author(s):  
Richard L. Freyman ◽  
David A. Nelson
Keyword(s):  
Short Duration ◽  
Discrimination Performance ◽  
Frequency Discrimination ◽  
Normal Hearing ◽  
Stimulus Level ◽  
Hearing Impaired ◽  
Long Duration ◽  
Sensorineural Hearing Impairment ◽  
Pure Tones ◽  
Low Levels

This investigation explored the effects of stimulus level on the frequency discrimination of long- and short-duration pure tones by 5 subjects with normal hearing and 7 with sensorineural hearing impairment. Frequency difference limens (DLs) were obtained as a function of signal intensity for 5-ms and 300-ms tones at 500, 1000, and 2000 Hz. The performance of most of the hearing-impaired subjects was poorer than normal for 300-ms tones, but not for 5-ms tones. This result was relatively independent of the stimulus sensation levels at which the data were compared. However, the current results also show an unexpected dependence of the frequency DL on the sensation level of short-duration tones. In several normal-hearing subjects, frequency discrimination performance for these short tones is poorer at moderately high levels than at low levels.

Reading Identity, Reading Essence: A Strategic Essentialist Approach to Mulk Raj Anand’s Untouchable

2021 ◽  
Vol 2 (4) ◽  
pp. 91-101
Author(s):  
Saleha Ilhaam
Keyword(s):  
Present Article ◽  
Human Existence ◽  
The Other ◽  
Political Strategy ◽  
Other Hand ◽  
Strategic Essentialism ◽  
Reading Identity ◽  
The Difference ◽  
The Individual ◽  
Individual Self

The term strategic essentialism, coined by Spivak, is generally understood as “a political strategy whereby differences (within Group) are temporarily downplayed, and unity assumed for the sake of achieving political goals.” On the other hand, essentialism focuses that everything in this world has an intrinsic and immutable essence of its own. The adaption of a particular “nature” of one group of people by way of sexism, culturalization, and ethnification is strongly linked to the idea of essentialism. Mulk Raj Anand’s Bakha is dictated as an outcast by the institutionalized hierarchy of caste practice. He is essentialized as an untouchable by attributing to him the characteristic of dirt and filth. However, unlike other untouchables, Bakha can apprehend the difference between the cultured and uncultured, dirt and cleanliness. Via an analysis of Anand’s “Untouchable,” the present article aims to bring to the forefront the horrid destruction of the individual self that stems from misrepresentations of personality. Through strategic essentialism, it unravels Bakha’s contrasting nature as opposed to his pariah class, defied by his remarkable inner character and etiquette. The term condemns the essentialist categories of human existence. It has been applied to decontextualize and deconstruct the inaccurately essentialized identity of Bakha, which has made him a part of the group he does not actually belong to.

Phoneme Feature Perception in Noise by Normal-Hearing and Hearing-Impaired Subjects

1985 ◽  
Vol 28 (1) ◽  
pp. 87-95 ◽  
Author(s):  
Sandra Gordon-Salant
Keyword(s):  
Signal To Noise Ratio ◽  
Normal Hearing ◽  
Hearing Impaired ◽  
Noise Condition ◽  
Percent Correct ◽  
Vowel Context ◽  
Hearing Status ◽  
Vowel Recognition ◽  
Phoneme Perception ◽  
The Individual

The purpose of this investigation was to determine whether normal-hearing and hearing-impaired listeners perceive phoneme features differently in noise and to determine whether phoneme perception changes as a fuction of signal-to-noise ratio (S/N). Consonant-vowel recognition by normal-hearing and hearing-impaired listeners was assessed in quiet and in three noise conditions. Analysis of total percent correct recognition scores revealed significant effects of hearing status, S/N, and vowel context. Patterns of phoneme errors were analyzed by INDSCAL, Derived consonant features that accounted for phoneme errors by both subject groups were similar to ones reported by other investigators. However, weightings associated with the individual features varied with changes in noise condition. Although hearing-impaired listeners exhibited poorer overall nonsense syllable recognition scores in noise than normal-hearing listeners, no specific set of features emerged from the multidimensional scaling procedures that could uniquely account for this performance deficit.

The Effect of Fluctuations on the Perception of Low Frequency Sound

2007 ◽  
Vol 26 (2) ◽  
pp. 81-89 ◽  
Author(s):  
A T Moorhouse ◽  
D C Waddington ◽  
M D Adams
Keyword(s):  
Laboratory Tests ◽  
Sound Pressure ◽  
Hearing Threshold ◽  
Low Frequency ◽  
Fast Response ◽  
Pressure Level ◽  
Rate Of Change ◽  
Frequency Noise ◽  
The Difference ◽  
Method Of Adjustment

Results of laboratory tests are presented in which 18 subjects, including some low frequency noise sufferers, were presented with low frequency sounds with varying degrees of fluctuation. Thresholds of acceptability were obtained for each sound and each subject, using the method of adjustment. These thresholds were then normalised to individual low frequency hearing threshold. It was found that sufferers tend to set thresholds of acceptability closer to their hearing threshold than other subject groups. Also, acceptability thresholds were set on average 5dB lower for fluctuating sounds. It is proposed that a sound should be considered fluctuating when the difference between L10 and L90 exceeds 5dB, and when the rate of change of the ‘Fast’ response sound pressure level exceeds 10dB/s

scholarly journals Occupational structure of bearers of Jewish rabbinical, occupational and generic surnames

F1000Research ◽  
2020 ◽  
Vol 9 ◽  
pp. 971
Author(s):  
Alexander Jonathan Vidgop ◽  
Nelly Norton ◽  
Nechama Rosenberg ◽  
Malka Haguel-Spitzberg ◽  
Itzhak Fouxon
Keyword(s):  
Confidence Interval ◽  
The Self ◽  
The Other ◽  
Occupational Structure ◽  
Significant Difference ◽  
Standard Classification ◽  
The Difference ◽  
The Individual ◽  
Study Choice

We study choice of profession in three groups of Russian-speaking Jewish families with different occupational distributions of the ancestors. This study continues exploration of the persistence of social status of families over centuries that was initiated in recent years. It was found previously that in some cases professions remain associated with the same surnames for many generations. Here the studied groups are defined by a class of the surname of individuals composing them. The class serves as a label that indicates a professional bias of the ancestors of the individual. One group are the bearers of the class of surnames which were used by rabbinical dynasties. The other group is constituted by occupational surnames, mostly connected to crafts. Finally, the last group are generic Jewish names defined as surnames belonging to neither of the above groups. We use the self-collected database that consists of 858 and 1057 of the first two groups, respectively, and 7471 generic Jewish surnames. The statistics of the database are those of individuals drawn at random from the considered groups. We determine shares of members of the groups working in a given type of occupations together with the confidence interval. The occupational type’s definition agrees with International Standard Classification of Occupations. It is demonstrated that there is a statistically significant difference in the occupational structure of the three groups that holds beyond the uncertainty allowed by 95% confidence interval. We quantify the difference with a numerical measure of the overlap of professional preferences of different groups. We conclude that in our study the occupational bias of different population groups is preserved at least for two centuries that passed since the considered surnames appeared.

scholarly journals Flexible Specialization. Flexible Accumulation

Geografie ◽  
1995 ◽  
Vol 100 (2) ◽  
pp. 115-121
Author(s):  
David Uhlíř
Keyword(s):  
Regional Development ◽  
The Other ◽  
Great Flexibility ◽  
Theoretical Concepts ◽  
Flexible Specialization ◽  
The Social ◽  
The Difference ◽  
Flexible Accumulation ◽  
The Individual ◽  
Organization Of Production

This article deals with two theoretical concepts: flexible specialization and flexible accumulation. It starts with a very brief description of the changes in organization of production that occurred in the recent decades as a consequence of the 1970s and early 1980s crises. Their single most important characteristic is a great flexibility. Subsequently, the ways in which the two theories explain the changes themselves and their consequences are described in a more detailed manner. This includes reactions of the economic subjects involved, i.e. the state and the individual enterprises. Further on, the author aims to clarify the difference between two "flexible concepts" that are often misinterpreted in geographical literature. The distinction leads to an evaluation of the flexible specialization theory as an important contribution to the theories of regional development: on the other hand the flexible accumulation theorizes more generally the social and economic change. Several critical remarks concerning both theories are quoted in the last part of this article.

scholarly journals Occupational structure of bearers of Jewish rabbinical, occupational and generic surnames

F1000Research ◽  
2020 ◽  
Vol 9 ◽  
pp. 971
Author(s):  
Alexander Jonathan Vidgop ◽  
Nelly Norton ◽  
Nechama Rosenberg ◽  
Malka Haguel-Spitzberg ◽  
Itzhak Fouxon
Keyword(s):  
Confidence Interval ◽  
Social Status ◽  
The Other ◽  
Occupational Structure ◽  
Significant Difference ◽  
Standard Classification ◽  
The Difference ◽  
The Individual ◽  
Study Choice

We study choice of profession in three groups of Russian-speaking Jewish families with different occupational distributions of the ancestors. This study continues exploration of the persistence of social status of families over centuries that was initiated in recent years. It was found previously that in some cases professions remain associated with the same surnames for many generations. Here the studied groups are defined by a class of the surname of individuals composing them. The class serves as a label that indicates a professional bias of the ancestors of the individual. One group are the bearers of the class of surnames which were used by rabbinical dynasties. The other group is constituted by occupational surnames, mostly connected to crafts. Finally, the last group are generic Jewish names defined as surnames belonging to neither of the above groups. We use the database that consists of 858 and 1057 of the first two groups, respectively, and 7471 generic Jewish surnames. The statistics of the database are those of individuals drawn at random from the considered groups. We determine shares of members of the groups working in a given type of occupations together with the confidence interval. The occupational type’s definition agrees with International Standard Classification of Occupations. It is demonstrated that there is a statistically significant difference in the occupational structure of the three groups that holds beyond the uncertainty allowed by 95% confidence interval. We quantify the difference with a numerical measure of the overlap of professional preferences of different groups. We conclude that in our study the occupational bias of different population groups is preserved at least for two centuries that passed since the considered surnames appeared.

Perceptual Isolation and Schizophrenia

1961 ◽  
Vol 107 (450) ◽  
pp. 839-844 ◽  
Author(s):  
Stanley Smith ◽  
H. Thakurdas ◽  
T. G. G. Lawes
Keyword(s):  
Sound Pressure ◽  
Sensory Deprivation ◽  
Skin Irritation ◽  
Pressure Level ◽  
The Other ◽  
Experimental Conditions ◽  
Princeton University ◽  
Mcgill University ◽  
The Subject ◽  
Physical Effects

The early investigators in the field of perceptual isolation were at McGill University, especially Bexton et al. (1954). Since then there have been many subsequent works and papers on the subject. In general, published results of this type of experiment can be divided into two groups. Sometimes marked sequelae to sensory deprivation have been described (Bexton et al., 1954 and Goldberger et al., 1958). Such disturbances included thinking, imagery and time appreciation, together with delusional and hallucinatory phenomena. On the other hand, at Princeton University, Vernon et al. (1956), under very carefully controlled experimental conditions, found virtually no sequelae. A paper published from this hospital (Smith and Lewty, 1959) described a silent room which was designed, constructed and standardized to a mean sound pressure level difference of 80 decibels. (Measurements made at octave intervals from 80-10,000 c./sec.) In this particular room 20 volunteers spent varying periods from 5 hours 50 minutes to 92 hours 20 minutes under conditions of partial and complete sensory deprivation. We used a room so as to mitigate the physical effects of reduced somatic activity and fur gloves were used instead of the more common cardboard cylinders, which after a period of time produce a great deal of skin irritation and indeed abrasions, and introduce a great deal of unnecessary complications into a study of pure sensory deprivation.

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