temporal expectations. It is therefore tempting to consider that a single mechanism,
depending on the processing of very brief sequential events, is responsible for impairments
obtained in both tasks.
However, it is too early to assume that such impairments can be explained by a unique
deficit. We already suggested that deficit in anisochrony discrimination of rapid sequences
can also result from the saturation of sensory memory or from an inability to judge the
temporal order. Such a hypothesis should be tested in the future to elucidate the nature of
the deficit characterizing subjects with LTL dysfunction.
Acknowledgements
We are also indebted to Xavier Gangand for programming the experiments. This research
was supported by a grant from Contrat d’objectif Région Nord—Pas de Calais:‘Motricité
et Cognition’(France) and by GIS ‘Dysfonctionnement de la Cognition’.
References
1.Efron, R.(1963) Temporal perception, aphasia and déjà vu.Brain, 86, 403–24.
2.Tallal, P.and F. N e w c o m b e(1978) Impairment of auditory perception and language compre-
hension in dysphasia.Brain and Language5, 13–24.
3.Lackner, J. R.and H. L. Teuber(1973) Alterations in auditory fusion thresholds after cerebral
injury in man.Neuropsychologia11, 409–15.
4.Mills, L.and G. B. Rollman(1980) Hemispheric asymmetry for auditory perception of tempo-
ral order.Neuropsychologia18, 41–7.
5.Robin, D. A., D. Tranel,and H. Damasio(1990) Auditory perception of temporal and spectral
events in patients with focal left and right cerebral lesions.Brain and Language, 39, 539–55.
6.Sherwin, L.and R. Efron(1980) Temporal ordering deficits following anterior temporal lobec-
tomy.Brain and Language11, 195–203.
7.Swisher, L.and I. J. Hirsh(1972) Brain damage and the ordering of two temporally successive
stimuli.Neuropsychologia10, 137–52.
8.Griffiths, T. D.,et al.(1997) Spatial and temporal auditory processing deficits following right-
hemisphere infarction.Brain, 120, 785–94.
9.Musiek, F. E., J. A. Baran, and M. L. Pinheiro(1990) Duration pattern recognition in normal sub-
jects and patients with cerebral and cochlear lesions.Audiol.29, 304–13.
10.Albert, M. L.,et al.(1972) A case study of auditory agnosia: linguistic and non-linguistic pro-
cessing.Cortex8, 427–43.
11.Milner, B.(1962) Laterality effects in audition. In V. Mountcastle (ed.) Interhemispheric Relations
and Cerebral Dominance, Baltimore: John Hopkins University Press, pp. 173–201.
12.Liégeois-Chauvel, C.,et al. (1999) Specialization of left auditory cortex for speech perception in
man depends on temporal coding.Cereb Cortex9, 484–96.
13.Gordon, H.(1978) Left-hemisphere dominance for rhythmic elements in dichotically-presented
melodies.Cortex, 14, 58–70.
14.Halperin, Y., I. Nachshon, and A. Carmon(1973) Shift of ear superiority in dichotic listening to
temporally patterned nonverbal stimuli.J. Acousti. Soc. Am.53, 46–50.
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