If multimodal integration and synchronisation of speech stimuli are based on dependent mechanisms, it seems straightforward to predict that individual differences for our two measures will correlate positively. Alternatively, a null correlation
seems intuitively likely if these mechanisms were fully independent. We find neither. Our counterintuitive results call for a revised understanding of how the brain solves the multiple-clocks problem, which we propose. Our study simply replicated the dual-task paradigm of Soto-Faraco and Alsius (2007) with PH and normal controls. On each trial, we presented brief movies with a range of audiovisual asynchronies. There then followed two tasks, temporal order judgement (TOJ) and phoneme discrimination, Protein Tyrosine Kinase inhibitor to obtain two concurrent measures of the audiovisual asynchrony that (1) is perceived as synchronous, and (2) induces maximal Crizotinib in vivo integration, as measured by the strength of the McGurk illusion. We then analysed individual differences on these measures rather than just average performance. As PH’s phenomenology is of a distinct temporal order, of lips lagging voices, TOJ was chosen to probe his subjective report as directly as possible. We were also concerned that the alternative paradigm, Simultaneity Judgement,
might be performed heuristically on the basis of the quality of speech integration, and thus our measure of subjective timing in PH and control subjects might have been confounded by changes in integration as a function of asynchrony. Before reporting the methods and results of our experiments we first provide detailed documentation of case PH. PH, a retired pilot aged 67, first experienced auditory leading while watching television. He initially suspected poor dubbing, but then Tryptophan synthase later noticed the same phenomenon in conversations with people. After seeking medical advice at his workplace, he was referred to Professor Peter Brown at his Queen Square neurology clinic, where we
recruited him for this research. He also reports perceiving the sound of his own voice before the proprioception of his corresponding mouth and jaw movements. The onset seems to have been abrupt, not accompanied by any other symptoms, and initially progressing slowly but now stable according to his subjective reports, though becoming temporarily more intense when fatigued. He also reported experiencing difficulty in speech comprehension in noisy environments, though attributes this to tinnitus. In November 2007 he had surgery to treat pericarditis, and in 2008 he had developed generalised myasthenia gravis [anti-acetylcholine (ACh) receptor antibody and electromyography (EMG) positive]. His current complaint came on 2–3 months after the onset of the myasthenia, however it is unknown to what extent these phenomena are related (Keesey, 1999). A routine neurological examination revealed no abnormalities. There was no evidence of fatiguability.
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