Tactile stimulation of the hand causes bilateral cortical activation: a functional magnetic resonance study in humans
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Acknowledgements
The authors wish to thank Tomas Hindmarsh, Anders Wennerberg and Jonny Carlsson for valuable technical assistance. This investigation has been supported by grants from the Lions Research Foundation, Swedish Medical Research Council (Project No. 14X–4255) and Östergötlands Läns Landsting (ÖLL).
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Cortical lateralization of cheirosensory processing in callosal dysgenesis
2019, NeuroImage: ClinicalCitation Excerpt :The callosal connections of the somatosensory cortices play a critical role in a number of higher-order cognitive processes, among which left tactile naming stands as the most representative. Neuroimaging and neurophysiological studies have shown that the CC mediates interhemispheric transfer between homologous S1 subareas and S2 (Eickhoff et al., 2008, 2012; Nihashi et al., 2005; Schnitzler et al., 1995) Callosal transmission is indicated, for example, by the smaller magnitude of ipsilateral somatosensory activation in normal volunteers (Hansson and Brismar, 1999). The interhemispheric transfer of somatosensory information is supposed to complement the ipsilateral projections from the hands to S1, which are now accepted by most investigators as critical for actions in which the hands work in concert, for left tactile naming, for affective touch, and for object recognition through active touch (Sutherland, 2006).
Inter-hemispheric plasticity in patients with median nerve injury
2016, Neuroscience LettersCitation Excerpt :This may be due to strong inhibition [21], but the relative impact of excitation and inhibition on the BOLD signal remains unclear [20]. In previous studies we found that patients with median nerve injury have greater ipsilateral activation during unilateral stimulation of the median nerve, both upon stimulation of the injured and the healthy hand, compared to healthy controls [11,14]. The tactile stimulation technique was similar in these studies but the fMRI paradigms differed.
Differences of the frontal activation patterns by finger and toe movements: A functional MRI study
2013, Neuroscience LettersTransition from the locked in to the completely locked-in state: A physiological analysis
2011, Clinical NeurophysiologyCitation Excerpt :During the vibrotactile stimulation (Experiment C) no correlated activity was found in any of the implanted electrodes during any of the stimulations performed on the three different body parts (Index finger, toe and lip). This result is in complete contrast with similar procedures that elicited clear cortical responses in healthy and epilepsy samples (Diesch et al., 2001; Ray et al., 2008; Hansson and Brismar, 1999). Nevertheless, while passive movements were performed on patient’s foot and hand, activation of the somatosensory cortex was detected with and without simultaneous motor imagery task.
Effects of parietal TMS on somatosensory judgments challenge interhemispheric rivalry accounts
2010, NeuropsychologiaCitation Excerpt :Second, in contrast to the experiments cited above, several electrophysiological and imaging studies have demonstrated a bilateral SI response to unilateral tactile stimulation. In humans, intracranial recording (Noachtar, Luders, Dinner, & Klem, 1997), magnetoencephalography (MEG; see Kanno, Nakasato, Hatanaka, & Yoshimoto, 2003; Korvenoja et al., 1995; Schnitzler, Salmelin, Salenius, Jousmaki, & Hari, 1995) and functional magnetic resonance imaging (fMRI: see Hamalainen, Hiltunen, & Titievskaja, 2002; Hansson & Brismar, 1999; Nihashi et al., 2005; Polonara, Fabri, Manzoni, & Salvolini, 1999) have all shown that median-nerve or hand stimulation can partially activate regions within ipsilateral SI, in addition to contralateral SI. Furthermore, in monkeys, a series of single-cell recording studies by Iwamura and colleagues showed that some neurons in the caudal-most portion of SI display bilateral hand receptive fields (for review, see Iwamura, Taoka, & Iriki, 2001).