BACKGROUND First-order relatives of persons with Autism Spectrum Disorder (ASD) exhibit a cognitive pattern which is part of a broader autism phenotype. METHOD The purpose of the present study was to evaluate whether some neuropsychological features related to the autism phenotype are present in parents of ASD children. To this end, the exploration included a dichotic listening task, handedne...

This study conducted a follow-up of 13 early-onset slightly disabled Relapsing-Remitting Multiple Sclerosis (RRMS) patients within an year, evaluating both CC area measurements in a midsagittal Magnetic Resonance (MR) image, and Dichotic Listening (DL) testing with stop consonant vowel (C-V) syllables. Patients showed a significant progressive loss of posterior CC areas (isthmus and splenium) r...

This report presents evidence for changes in dichotic listening asymmetries across the menstrual cycle, which replicate studies from our laboratory and others. Increases in the right ear advantage (REA) were present in women at phases of the menstrual cycle associated with higher levels of ovarian hormones. The data also revealed correlations between hormone levels and behavioural measures of a...

Language function in the right-hemispheric homologues of Broca's and Wernicke's areas does not only correlate with left-handedness or pathology, but occurs naturally in right-handed healthy subjects as well. In the current study, two non-invasive methods of assessing language lateralization are correlated with behavioral results in order to link hemispheric dominance to language ability in heal...

BACKGROUND Although schizophrenia is presumed to be heterogeneous, there has been limited success distinguishing familial from sporadic cases. We used psychobiological measures to examine heterogeneity, as they may be closer to neurobiology than symptoms. Smooth pursuit eye movement quality (SPEM) and dichotic listening (DL) tests to tones and words were used to assess hemispheric laterality as...

Dichotic listening experiments show a right-ear advantage (REA), reflecting a left-hemisphere (LH) dominance. However, we found a decrease in REA when the initial stop consonants of two simultaneous French CVC words differed in voicing rather than place of articulation (Experiment 1). This result suggests that the right hemisphere (RH) is more involved in voicing than in place processing. The v...

In dichotic listening, two competing messages are delivered to the left and right ear, respectively. Right-handed subjects tend to report hearing more frequently the message input to the right ear. This is called Right Ear Advantage (REA). When intensities and other properties of the messages are properly adjusted, subjects may have a single perception localized to the center of the head. Frequ...

We tested the hypothesis that children with Tourette syndrome (TS) would exhibit aberrant brain lateralization compared to a healthy control (HC) group in an attention-modulation version of a verbal dichotic listening task using consonant-vowel syllables. The modulation of attention to focus on the right ear stimulus in the dichotic listening situation is thought to involve the same prefrontal ...

Most of the studies I will be describing have been done with normal subjects, but I want first to review briefly some clinical studies which provide a background for the normal data. This work originated at the Montreal Neurological Institute while I was doing research, with Dr. Brenda Milner, on the functional differentiation of the right and left temporal lobes. One of the tests employed in i...