Deficit of temporal auditory processing in dyslexic adults

Hari, Riitta; Kiesilä, P.

doi:10.1016/0304-3940(96)12393-4

Cited by 158 publications

(79 citation statements)

References 9 publications

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“…Such a correspondence over sites (and even modalities) has been described before in the temporal range required to produce saltatory sensations (Geldard, 1975). Hari (1995;Hari & Kiesila, 1996) replicated and extended some ofthese data to show that auditory saltation occurred over the same ranges oftime as tactual saltation (see also Shore, Hall, & Klein, 1998). These data are particularly interesting because auditory localization requires binaural central nervous system computation, whereas it is likely that tactile localization is based on cortical somatotopic organization (Burton & Sinclair, 1996, p. 113), so perceived mislocalizations in the two modalities must occur beyond these levels ofprocessing.…”

Section: Discussionmentioning

confidence: 61%

The generation of vibrotactile patterns on a linear array: Influences of body site, time, and presentation mode

Cholewiak

Collins

2000

Perception & Psychophysics

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In order to provide information regarding orientation or direction, a convenient code employs vectors (lines) because they have both length and direction. Potential users of such information, encoded tactually, could include persons who are blind, as well as pilots, astronauts, and scuba divers, all of whom need to maintain spatial awareness in their respective unusual environments. In these situations, a tactile display can enhance environmental awareness. In this study, optimal parameters were explored for lines presented dynamically to the skin with vibrotactile arrays on three body sites, with veridical and saltatory presentation modes. Perceived length, straightness, spatial distribution, and smoothness were judged while the durations of the discrete taps making up the "drawn" dotted lines and the times between them were varied. The results indicate that the two modes produce equivalent sensations and that similar sets of timing parameters, within the ranges tested, result in "good" lines at each site.In situations in which vision and/or audition are absent or are available but limited by information overload, an efficient use of the available sensory modalities might be to employ the sense of touch for the accurate perception ofalerts, position, mobility, or navigation (see, e.g., Korteling & van Emmerik, 1998). With such a system, involving spatial orientation and attitude awareness, it might be necessary to present tactile patterns in different orientations, on different body sites, for extended periods oftime, and/or in the presence of distracting noise or competing stimuli from other sensory modalities. Thus, for best use, the tactile patterns employed should produce readily perceived sensations whose meanings are intuitive or at least, as Penders (1953) described, "meaningful within their situation" (p. 15). One such pattern could be a directional line, a vector. The purpose ofthe present experiments was to examine the parameters of linear vibrotactile patterns that would allow them to be readily appreciated. These include exploration of the body sites and presentation conditions for generating "good" vibrotactile lines, for even the simplest oflinear patterns can differ greatly in salience,

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Section: Discussionmentioning

confidence: 61%

The generation of vibrotactile patterns on a linear array: Influences of body site, time, and presentation mode

Cholewiak

Collins

2000

Perception & Psychophysics

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“…In a previous study in our laboratory, we found that developmentally dyslexic children were somewhat impaired in temporal acuity tasks in all sensory modalities investigated, relative to their agematched controls (Laasonen et al, 2000). Other Finnish studies (Hari & Kiesilä, 1996;Hari et al, 2001;Hari, Valta, & Uutela, 1999;Helenius, Uutela, & Hari, 1999;Kujala et al, 2000) have found impaired processing of rapid auditory and visual sequences in adult dyslexics, but these studies did not include multiple modality comparisons.…”

mentioning

confidence: 57%

Temporal order and processing acuity of visual, auditory, and tactile perception in developmentally dyslexic young adults

Laasonen

Virsu

2001

Cognitive, Affective, & Behavioral Neuroscience

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“…There is much evidence indicating that the left AC is specialized for processing rapidly changing sounds, regardless of whether speech or nonspeech (10)(11)(12)(13). In support of a causal connection to speech processing, there are a number of studies showing temporal processing deficits in language-impaired children (14,15) or dyslexic adults (16,17), and some of these studies indicate that these deficits can be overcome by training (14,17). Corresponding to the genetic basis of speech and language (18), brain imaging studies showed that in infants a few months old (19) and even in neonates (20), i.e., well before the onset of speech production, there is a left-hemisphere superiority to process specific properties of speech.…”

mentioning

confidence: 99%

Global versus local processing of frequency-modulated tones in gerbils: An animal model of lateralized auditory cortex functions

Wetzel

Ohl

Scheich

2008

Proc. Natl. Acad. Sci. U.S.A.

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Hemispheric asymmetries of speech and music processing might arise from more basic specializations of left and right auditory cortex (AC). It is not clear, however, whether such asymmetries are unique to humans, i.e., consequences of speech and music, or whether comparable lateralized AC functions exist in nonhuman animals, as evolutionary precursors. Here, we investigated the cortical lateralization of perception of linearly frequency-modulated (FM) tones in gerbils, a rodent species with human-like lowfrequency hearing. Using a footshock-reinforced shuttle-box avoidance go/no-go procedure in a total of 178 gerbils, we found that (i) the discrimination of direction of continuous FM (rising versus falling sweeps, 250-ms duration) was impaired by right but not left AC lesions; (ii) the discrimination of direction of segmented FM (50-ms segments, 50-ms silent gaps, total duration 250 ms) was impaired by bilateral but not unilateral AC lesions; (iii) the discrimination of gap durations (10 -30 ms) in segmented FM was impaired by left but not right AC lesions. AC lesions before and after training resulted in similar effects. Together, these experiments suggest that right and left AC, even in rodents, use different strategies in analyzing FM stimuli. Thus, the right AC, by using global cues, determines the direction of continuous and segmented FM but cannot discriminate gap durations. The left AC, by using local cues, discriminates gap durations and determines FM direction only when additional segmental information is available.asymmetry ͉ lateralization ͉ rodents

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Deficit of temporal auditory processing in dyslexic adults

Cited by 158 publications

References 9 publications

The generation of vibrotactile patterns on a linear array: Influences of body site, time, and presentation mode

The generation of vibrotactile patterns on a linear array: Influences of body site, time, and presentation mode

Temporal order and processing acuity of visual, auditory, and tactile perception in developmentally dyslexic young adults

Global versus local processing of frequency-modulated tones in gerbils: An animal model of lateralized auditory cortex functions

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