Effects of Prolonged Exposure to Audiovisual Stimuli with Fixed Stimulus Onset Asynchrony on Interaction Dynamics between Primary Auditory and Primary Visual Cortex

Audiovisual Temporal Recalibration: Space-Based versus Context-Based

“…These results were consistent with those in experiment 1 in that all PSSs were positive, which means that tone should precede blob in order to be perceived as simultaneous. Although the visual latency usually should have been longer than the auditory latency (Di Luca et al 2009; Yarrow et al 2011a), it might not exclude the unexpected observations that auditory latency was longer post-adaptation (Fujisaki et al 2004;Roseboom and Arnold 2011;Vroomen et al 2004).…”

“…Although we cannot yet unveil the neural correlates of the behaviourally measured 'criteria shift' with psychophysical experiments, some sophisticated human and animal studies have already made valuable implications of the neural processes and the locus of temporal recalibrations (Fillbrandt and Ohl 2012;Roach et al 2011;Yu et al 2009). One dedicated model that was proposed by Roach et al (2011) assumed that the population codes of neurons are tuned to different asynchronies, and the effect of adaptation is to selectively reduce neuronal response gain.…”

“…In contrast, the recalibration of timing could be achieved through intrinsic models and localised at an early stage. In animals, in order to enhance multisensory integration, timing seems to be recalibrated either by the characteristic changes in the magnitude, duration or latency of the neuronal responses to successive stimuli in a single multisensory neuron in the superior colliculus (Yu et al 2009), or by the interaction dynamics between the primary visual and auditory cortex (Fillbrandt and Ohl 2012).…”

“…One reasonable solution to this question is the adaptive recalibration of the perceived simultaneity point of the audiovisual stimuli through prior experience/knowledge (Fujisaki et al 2004;Heron et al 2007). After exposure to asynchronous stimuli, audiovisual couples with adapted temporal orders are more likely to be perceived as simultaneous than those with reverse temporal orders.…”

“…After exposure to asynchronous stimuli, audiovisual couples with adapted temporal orders are more likely to be perceived as simultaneous than those with reverse temporal orders. Consequently, the measured point of subjective simultaneity (PSS) shifts in the direction of asynchrony (Di Luca et al 2009;Fujisaki et al 2004;Roseboom and Arnold 2011;Vroomen et al 2004;Yarrow et al 2011a;Yuan et al 2012).…”