When correlation implies causation in multisensory integration

Parise C, Spence C, Ernst MO (2012)
Current Biology 22(1): 46-49.

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Inferring which signals have a common underlying cause and hence should be integrated, represents a primary challenge for a perceptual system dealing with multiple sensory inputs [1-3]. This challenge is often referred to as the correspondence problem or causal inference. Previous research has demonstrated that spatiotemporal cues, along with prior knowledge, are exploited by the human brain to solve this problem [4-9]. Here we explore the role of correlation between the fine temporal structure of auditory and visual signals in causal inference. Specifically, we investigated whether correlated signals are inferred to originate from the same distal event and hence are integrated optimally [10]. In a localization task with visual, auditory, and combined audiovisual targets, the improvement in precision for combined relative to unimodal targets, was statistically optimal only when audiovisual signals were correlated. This result demonstrates that humans use the similarity in the temporal structure of multisensory signals to solve the correspondence problem, hence inferring causation from correlation.
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Parise C, Spence C, Ernst MO. When correlation implies causation in multisensory integration. Current Biology. 2012;22(1):46-49.
Parise, C., Spence, C., & Ernst, M. O. (2012). When correlation implies causation in multisensory integration. Current Biology, 22(1), 46-49.
Parise, C., Spence, C., and Ernst, M. O. (2012). When correlation implies causation in multisensory integration. Current Biology 22, 46-49.
Parise, C., Spence, C., & Ernst, M.O., 2012. When correlation implies causation in multisensory integration. Current Biology, 22(1), p 46-49.
C. Parise, C. Spence, and M.O. Ernst, “When correlation implies causation in multisensory integration”, Current Biology, vol. 22, 2012, pp. 46-49.
Parise, C., Spence, C., Ernst, M.O.: When correlation implies causation in multisensory integration. Current Biology. 22, 46-49 (2012).
Parise, Cesare, Spence, Charles, and Ernst, Marc O. “When correlation implies causation in multisensory integration”. Current Biology 22.1 (2012): 46-49.
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