12/21/2023 0 Comments Crossfont 5.3According to recent theoretical models, sensory attenuation is explained by an anticipatory modulation of sensory processing that occurs before the expected stimulus ( Roussel et al. 2005), the question how sensory cortex function differs when a stimulus is self-generated remains controversial (see, e.g., Brown et al. While attenuation phenomena in humans have been localized to sensory cortices ( Blakemore et al. 2011b) systems, as well as in other sensory modalities across species (for a review, see Cullen 2004). Attenuation phenomena have been demonstrated in the human somatosensory ( Chapman et al. This decrease is often explained by a cancellation of predicted reafferent sensory signals (e.g., Cullen 2004 but see Brown et al. Sensory attenuation refers to a decrease in perceived intensity of stimuli that are self-generated. One phenomenon generally taken as evidence for sensory prediction of action consequences is sensory attenuation ( Bays et al. The brain is thought to predict the sensory consequences of one's actions ( Wolpert and Flanagan 2001). Our findings confirm theoretical predictions of a sensory modulation prior to self-generated sensations and support the idea that a sensory prediction is generated in parallel to motor output ( Walsh and Haggard 2010), before an efference copy becomes available. Interestingly, this sensory signal emerged at a time when the hemispheric lateralization of motor signals in M1 indicated ongoing effector selection. This perceptual effect was reflected in a transient phase-locked signal in auditory cortex before stimulus onset and motor execution. In line with this effect on subjective agency, we found stronger sensory attenuation when the action that caused the tone was compatibly primed. Compatible priming is known to enhance a subjective experience of agency over a consequent stimulus ( Chambon and Haggard 2012). Effector selection was manipulated by subliminal motor priming. We recorded magnetoencephalography while subjects performed a simple action with either hand and judged the loudness of a tone caused by the action. Here, we show that an established manipulation of subjective agency over a stimulus leads to a predictive modulation in sensory cortex that is independent of these factors. Experimentally, prestimulus changes that occur in anticipation of self-generated sensations are difficult to disentangle from more general effects of stimulus expectation, attention and task load (performing an action). 2013) or even action execution ( Brown et al. Accordingly, recent theoretical models explain this attenuation by an anticipatory modulation of sensory processing prior to stimulus onset ( Roussel et al. This is generally taken as evidence for sensory prediction of action consequences. Sensory consequences of one's own actions are perceived as less intense than identical, externally generated stimuli.
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