Multisensory integration in hemianopia and unilateral spatial neglect: Evidence from the sound induced flash illusion

Bolognini, Nadia; Convento, Silvia; Casati, Carlotta; Mancini, Flavia; Brighina, Filippo; Vallar, Giuseppe

doi:10.1016/j.neuropsychologia.2016.05.015

Cited by 30 publications

(26 citation statements)

References 72 publications

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“…Together, the evidence suggests that the audiovisual fission illusion is a result of audiovisual integration. Hence, audiovisual fission and fusion illusions cannot be taken as the two facets of a single phenomenon (e.g., Bolognini et al, 2016); nor can they be accommodated easily using a single mechanism of multisensory integration (see Andersen et al, 2004).…”

Section: Discussionmentioning

confidence: 99%

“…The perceptual component of the sound-induced fission illusion is consistent with previous behavioral studies suggesting that the illusory flash in the fission illusion appears perceptually real (Berger et al, 2003;Fiedler, O'Sullivan, Schroter, Miller, & Ulrich, 2011;McCormick & Mamassian, 2008; though see van Erp, Philippi, & Werkhoven, 2013). In addition, neuropsychological studies suggest that the neural activity associated with the illusory flash in the fission illusion can be observed 30-60 ms after the onset of the second beep, fast enough, in other words, to reflect feedforward processing in the primary visual cortex (Mishra, Martinez, Sejnowski, & Hillyard, 2007;Shams, Iwaki, Chawla, & Bhattacharya, 2005;Watkins, Shams, Tanaka, Haynes, & Rees, 2006; see also Bolognini et al, 2016 for evidence from patients with visual field deficits caused by brain damage). Consistent with this view, the fission illusion can be modulated by transcranial direct current stimulation (tDCS) applied over occipital and temporal cortices (Bologini, Ressetti, Casati, Mancini, & Vallar, 2011).…”

Section: Discussionmentioning

confidence: 99%

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Central–peripheral differences in audiovisual and visuotactile event perception

Chen

Maurer

Lewis

et al. 2017

Atten Percept Psychophys

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We examined audiovisual and visuotactile integration in the central and peripheral visual field using visual fission and fusion illusions induced by sounds or taps. The fission illusion occurs when a single flash is perceived as two flashes if paired with two beeps or taps; the fusion illusion, by contrast, occurs when two flashes are perceived as a single flash if the flashes are paired with a single beep or tap. Beeps and taps induced similar patterns of illusions: the fission illusion was larger in the periphery than in the center, whereas the fusion illusion was larger in the center than in the periphery. An analysis based on signal detection theory revealed that both a decline in discriminability and a shift in criterion were associated with the more pronounced fission induced by sounds in the periphery. In contrast, only a shift in criterion was associated with the larger fission induced by taps in the periphery, and the larger fusion induced by a sound or tap in the center. To accommodate these findings, two accounts are proposed: audiovisual signals are more likely to be integrated in peripheral than in central vision, and the interpretation of visual signals favors discontinuous percepts, especially in the periphery.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Central–peripheral differences in audiovisual and visuotactile event perception

Chen

Maurer

Lewis

et al. 2017

Atten Percept Psychophys

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“…In this view, damage, malfunctioning or altered feedback from and toward the body matrix may be involved in the etiology of different clinical conditions (Riva, 2016a), from neurological disorders like neglect (Lenggenhager et al, 2012; Bolognini et al, 2016) and chronic pain (Tsay et al, 2015; Di Lernia et al, 2016b) to psychiatric disorders like schizophrenia (Ferri et al, 2014; Postmes et al, 2014), depression (Wheatley et al, 2007; Barrett et al, 2016), depersonalization/derealization disorder (Simeon et al, 2000; Jáuregui Renaud, 2015) and eating disorders (Riva et al, 2013; Riva, 2014, 2016b; Dakanalis et al, 2016; Serino et al, 2016a). …”

Section: The Body Matrixmentioning

confidence: 99%

Embodied Medicine: Mens Sana in Corpore Virtuale Sano

Riva

Serino

Lernia

et al. 2017

Front. Hum. Neurosci.

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Progress in medical science and technology drastically improved physicians’ ability to interact with patient’s physical body. Nevertheless, medicine still addresses the human body from a Hippocratic point of view, considering the organism and its processes just as a matter of mechanics and fluids. However, the interaction between the cognitive neuroscience of bodily self-consciousness (BSC), fundamentally rooted in the integration of multisensory bodily inputs, with virtual reality (VR), haptic technologies and robotics is giving a new meaning to the classic Juvenal’s latin dictum “Mens sana in corpore sano” (a healthy mind in a healthy body). This vision provides the basis for a new research field, “Embodied Medicine”: the use of advanced technologies for altering the experience of being in a body with the goal of improving health and well-being. Up to now, most of the research efforts in the field have been focused upon how external bodily information is processed and integrated. Despite the important results, we believe that existing bodily illusions still need to be improved to enhance their capability to effectively correct pathological dysfunctions. First, they do not follow the suggestions provided by the free-energy and predictive coding approaches. More, they lacked to consider a peculiar feature of the human body, the multisensory integration of internal inputs (interoceptive, proprioceptive and vestibular) that constitute our inner body dimension. So, a future challenge is the integration of simulation/stimulation technologies also able to measure and modulate this internal/inner experience of the body. Finally, we also proposed the concept of “Sonoception” as an extension of this approach. The core idea is to exploit recent technological advances in the acoustic field to use sound and vibrations to modify the internal/inner body experience.

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“…This is because this illusion is associated with brain activity 35–65 ms after the onset of the flash (Shams, Iwaki, Chawla, & Bhattacharya, 2005), and also with brain activity in the primary visual cortex (Watkins, Shams, Josephs, & Rees, 2007; Watkins, Shams, Tanaka, Haynes, & Rees, 2006). A recent patient study demonstrated that the occurrence of the sound-induced flash illusion is associated with damage in the left and right hemispheres that leads to visual-field deficits, but not with damage in the right hemisphere that leads to left neglect syndrome (Bolognini et al., 2016). Hence, even if the flashes and beeps exogenously capture attention toward the location where they are presented, attention likely does not modulate their integration in a top-down fashion, given that multisensory processing might have been completed.…”

Section: Does Rightward-biased Attention Lead To An Asymmetrical Effementioning

confidence: 99%

Hemispheric asymmetry: Looking for a novel signature of the modulation of spatial attention in multisensory processing

Chen

Spence

2016

Psychon Bull Rev

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The extent to which attention modulates multisensory processing in a top-down fashion is still a subject of debate among researchers. Typically, cognitive psychologists interested in this question have manipulated the participants’ attention in terms of single/dual tasking or focal/divided attention between sensory modalities. We suggest an alternative approach, one that builds on the extensive older literature highlighting hemispheric asymmetries in the distribution of spatial attention. Specifically, spatial attention in vision, audition, and touch is typically biased preferentially toward the right hemispace, especially under conditions of high perceptual load. We review the evidence demonstrating such an attentional bias toward the right in extinction patients and healthy adults, along with the evidence of such rightward-biased attention in multisensory experimental settings. We then evaluate those studies that have demonstrated either a more pronounced multisensory effect in right than in left hemispace, or else similar effects in the two hemispaces. The results suggest that the influence of rightward-biased attention is more likely to be observed when the crossmodal signals interact at later stages of information processing and under conditions of higher perceptual load—that is, conditions under which attention is perhaps a compulsory enhancer of information processing. We therefore suggest that the spatial asymmetry in attention may provide a useful signature of top-down attentional modulation in multisensory processing.

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Multisensory integration in hemianopia and unilateral spatial neglect: Evidence from the sound induced flash illusion

Cited by 30 publications

References 72 publications

Central–peripheral differences in audiovisual and visuotactile event perception

Central–peripheral differences in audiovisual and visuotactile event perception

Embodied Medicine: Mens Sana in Corpore Virtuale Sano

Hemispheric asymmetry: Looking for a novel signature of the modulation of spatial attention in multisensory processing

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