Development of a paradigm for measuring somatic disturbance in clinical populations with medically unexplained symptoms

Lloyd, David T.; Mason, Liam; Brown, Richard J.; Poliakoff, Ellen

doi:10.1016/j.jpsychores.2007.06.004

Cited by 48 publications

(96 citation statements)

References 15 publications

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“…Inclusion of the simultaneous task irrelevant light was also found to significantly increase vibration reports regardless of whether or not one was present; leading to increases in both hit rates and false-alarm rates. This result replicates previous findings (Johnson, Burton & Ro, 2006;Lloyd et al, 2008;McKenzie, Poliakoff, Brown et al, 2010;Mirams et al, 2010) and suggests that if visual information is available, participants incorporate it into decisions about ambiguous somatic events, even when such visual information is entirely task-irrelevant.…”

Section: Discussionsupporting

confidence: 89%

“…Somatic signal detection task (SSDT; Lloyd et al, 2008) The stimulus array in the SSDT consisted of a polystyrene wedge, into which a miniature electromagnetic solenoid stimulator (Dancer Design tactor; diameter 1.8mm) and a red light emitting diode (LED) 4mm in diameter was mounted. The tactor was affixed to the participant's left index finger with double sided adhesive pad.…”

Section: Mirage Systemmentioning

confidence: 99%

“…The current study therefore aimed to investigate how multisensory illusions applied to the hand would affect simple near threshold tactile perception using the SSDT (Lloyd et al, 2008). This task allows us to determine whether a particular manipulation affects tactile perception via changes in tactile sensitivity, or by altering response bias.…”

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confidence: 99%

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Multisensory distortions of the hand have differential effects on tactile perception

2015

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Research has suggested that altering the perceived\ud shape and size of the body image significantly\ud affects perception of somatic events. The current study\ud investigated how multisensory illusions applied to the body\ud altered tactile perception using the somatic signal detection\ud task. Thirty-one healthy volunteers were asked to report the\ud presence or absence of near-threshold tactile stimuli delivered\ud to the index finger under three multisensory illusion\ud conditions: stretched finger, shrunken finger and detached\ud finger, as well as a veridical baseline condition. Both\ud stretching and shrinking the stimulated finger enhanced\ud correct touch detections; however, the mechanisms underlying\ud this increase were found to be different. In contrast,\ud the detached appearance reduced false touch reports—possibly\ud due to reduced tactile noise, as a result of attention\ud being directed to the tip of the finger only. These findings\ud suggest that distorted representations of the body could\ud have different modulatory effects on attention to touch and\ud provide a link between perceived body representation and\ud somatosensory decision-making

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Section: Discussionsupporting

confidence: 89%

Section: Mirage Systemmentioning

confidence: 99%

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Multisensory distortions of the hand have differential effects on tactile perception

2015

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“…We examined alpha oscillations using electroencephalography (EEG) recorded while participants performed the Somatic Signal Detection Task (SSDT; Lloyd, Mason, Brown, & Poliakoff, 2008). In the SSDT, participants detect brief somatosensory stimuli delivered to their non-dominant hand at their individual perceptual threshold.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, an LED placed close to the non-dominant hand flashes during the SSDT, sometimes simultaneous with the tactile stimulus and sometimes on its own. The presence of the LED has previously been shown to increase false alarm rates (Brown, Brunt, Poliakoff, & Lloyd, 2010;Lloyd et al, 2008;Lloyd, McKenzie, Brown, & Poliakoff, 2011). A common impediment to examining the relationship between alpha power and false alarms is the relative lack of false alarm trials to examine.…”

Section: Introductionmentioning

confidence: 99%

Pre-stimulus alpha oscillations over somatosensory cortex predict tactile misperceptions

et al. 2017

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Cite this article as: Matt Craddock, Ellen Poliakoff, Wael El-deredy, Ekaterini Klepousniotou and Donna M. Lloyd, Pre-stimulus alpha oscillations over somatosensory cortex predict tactile misperceptions, Neuropsychologia, http://dx.doi.org/10. 1016/j.neuropsychologia.2016.12.030 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting galley proof before it is published in its final citable form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractFluctuations of pre-stimulus oscillatory activity in the somatosensory alpha band (8-14 Hz) observed using human EEG and MEG have been shown to influence the detection of supraand peri-threshold somatosensory stimuli. However, some reports of touch occur even without a stimulus. We investigated the possibility that pre-stimulus alpha oscillations might also influence these false reports of touch -known as tactile misperceptions. We recorded EEG while participants performed the Somatic Signal Detection Task (SSDT), in which participants must detect brief, peri-threshold somatosensory targets. We found that prestimulus oscillatory power in the somatosensory alpha range exhibited a negative linear 2 relationship with reporting of touch at electrode clusters over both contralateral and ipsilateral somatosensory regions. As pre-stimulus alpha power increased, the probability of reporting a touch declined; as it decreased, the probability of reporting a touch increased. This relationship was stronger on trials without a somatosensory stimulus than on trials with a somatosensory stimulus, although was present for both trial types. Spatio-temporal clusterbased permutation analysis also found that pre-stimulus alpha was lower on trials when touch was reported -irrespective of whether it was present -over contralateral and ipsilateral somatosensory cortices, as well as left frontocentral areas. We argue that alpha power may reflect changes in response criterion rather than sensitivity alone. Low alpha power relates to a low barrier to reporting a touch even when one is not present, while high alpha power is linked to less frequent reporting of touch overall.

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What Can We Sense? Interoceptive Accuracy

Köteles

2021

Body Sensations

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Development of a paradigm for measuring somatic disturbance in clinical populations with medically unexplained symptoms

Cited by 48 publications

References 15 publications

Multisensory distortions of the hand have differential effects on tactile perception

Multisensory distortions of the hand have differential effects on tactile perception

Pre-stimulus alpha oscillations over somatosensory cortex predict tactile misperceptions

What Can We Sense? Interoceptive Accuracy

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