Listar por autor "Grieve, Kenneth"
Mostrando ítems 1-20 de 21
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Actions of compounds manipulating the nitric Oxide system in the cat primary visual cortex
Cudeiro, Javier; Rivadulla, Casto; Rodríguez, Rosa; Grieve, Kenneth; Martínez-Conde, Susana; Acuña, Carlos (Wiley, 1997-10)[Abstract:] We iontophoretically applied NG-nitro-L-arginine (l-NOArg), an inhibitor of nitric oxide synthase (NOS), to cells (n= 77) in area 17 of anaesthetized and paralysed cats while recording single-unit activity ... -
Anandamide activation of CB1 receptors increases spontaneous bursting and oscillatory activity in the thalamus
Dasilva, Miguel; Grieve, Kenneth; Cudeiro, Javier; Rivadulla, Casto (Elsevier, 2014-02-05)[Abstract] The endocannabinoid system is a modulatory system that has been strongly associated with the regulation of functions as learning and memory, pain perception and sensory physiology in many areas of the central ... -
Balancing the excitability of M1 circuitry during movement observation without overt replication
Arias, Pablo; Robles-García, Verónica; Corral Bergantiños, Yoanna; Espinosa, Nelson; Mordillo-Mateos, Laura; Grieve, Kenneth; Oliviero, Antonio; Cudeiro, Javier (Frontiers, 2014-09-17)[Abstract] Although observation of a movement increases the excitability of the motor system of the observer, it does not induce a motor replica. What is the mechanism for replica suppression? We performed a series of ... -
Bursting thalamic responses in awake monkey contribute to visual detection and are modulated by corticofugal feedback
Ortuño Silva, Tania; Grieve, Kenneth; Cao, Ricardo; Cudeiro, Javier; Rivadulla, Casto (Frontiers, 2014-05-30)[Abstract] The lateral geniculate nucleus is the gateway for visual information en route to the visual cortex. Neural activity is characterized by the existence of two firing modes: burst and tonic. Originally associated ... -
Central fatigue induced by short-lasting finger tapping and isometric tasks: a study of silent periods evoked at spinal and supraspinal levels
Arias, Pablo; Robles-García, Verónica; Corral Bergantiños, Yoanna; Madrid, Andy; Espinosa, Nelson; Valls-Solé, Josep; Grieve, Kenneth; Oliviero, Antonio; Cudeiro, Javier (Elsevier, 2015-08-01)[Abstract] The neural substrates of fatigue induced by muscular activity have been addressed in depth in relation to isometric tasks. For these activities, when fatigue develops, it has been noted that the duration of the ... -
Changes in Visual Responses in the Feline dLGN: Selective Thalamic Suppression Induced by Transcranial Magnetic Stimulation of V1
Labra, Carmen de; Rivadulla, Casto; Grieve, Kenneth; Mariño Alfonso, Xurxo; Espinosa, Nelson; Cudeiro, Javier (Oxford University Press, 2006-08-14)[Abstract] Transcranial magnetic stimulation (TMS) of the cortex can modify activity noninvasively and produce either excitatory or inhibitory effects, depending on stimulus parameters. Here we demonstrate controlled ... -
Controlled trial on the effect of 10 days low-frequency repetitive transcranial magnetic stimulation (rTMS) on motor signs in Parkinson´s disease
Arias, Pablo; Vivas-Costa, Jamile; Grieve, Kenneth; Cudeiro, Javier (Wiley, 2010-07-28)[Abstract] We evaluated the effect of low-frequency rTMS on motor signs in Parkinson’s disease (PD), under a doubleblind placebo-controlled trial design. PD patients were randomly assigned to received either real (n 5 ... -
Differential feedback modulation of center and surround mechanisms in parvocellular cells in the visual thalamus
Jones, Helen E.; Andolina, Ian M.; Ahmed, Bashir; Shipp, Stewart D.; Clements, Jake T.; Grieve, Kenneth; Cudeiro, Javier; Salt, Thomas E.; Sillito, Adam M. (Society of Neuroscience, 2012-11-07)[Abstract] Many cells in both the central visual system and other sensory systems exhibit a center surround organization in their receptive field, where the response to a centrally placed stimulus is modified when a ... -
Double-blind, randomized, placebo controlled trial on the effect of 10 days low-frequency rTMS over the vertex on sleep in Parkinson’s disease
Arias, Pablo; Vivas-Costa, Jamile; Grieve, Kenneth; Cudeiro, Javier (Elsevier, 2010-07-31)[Abstract] Objective: A recent report indicates repetitive transcranial magnetic stimulation (rTMS) improves sleep in Parkinson’s disease (PD). The aim of this work is to evaluate the effect of 10 days rTMS on sleep ... -
Effects on EEG of low (1Hz) and high (15Hz) frequency repetitive transcranial magnetic stimulation of the visual cortex: a study in the anesthetized cat
Espinosa, Nelson; Labra, Carmen de; Rivadulla, Casto; Mariño Alfonso, Xurxo; Grieve, Kenneth; Cudeiro, Javier (Bentham Open, 2007-12-07)[Abstract] Here we confirm our earlier findings that showed 1Hz rTMS over the primary visual cortex of the anesthetized cat, known to cause inhibition of the cortex, induces an increase in power in the slow, delta band of ... -
Endocannabinoid CB1 receptors modulate visual output from the thalamus
Dasilva, Miguel A.; Grieve, Kenneth; Cudeiro, Javier; Rivadulla, Casto (Springer, 2011-07-20)[Abstract] Rationale Endocannabinoids have emerged as a modulatory brain system affecting different types of synapses, broadly distributed throughout the CNS, which explain the diverse psychophysical effects observed ... -
Further observations on the role of nitric oxide in the feline lateral geniculate nucleus
Cudeiro, Javier; Rivadulla, Casto; Rodríguez, R.; Martínez-Conde, Susana; Martínez, L.; Grieve, Kenneth; Acuña, Carlos (Wiley, 1996-01)[Abstract] We have examined the responses of a population of 77 cells in the dorsal lateral geniculate nucleus (dLGN) of the anaesthetized, paralysed cat. Here the synthetic enzyme for the production of nitric oxide, nitric ... -
Mixed burst and tonic firing in the thalamus: a study in the feline lateral geniculate nucleus in vivo
Grieve, Kenneth; Rivadulla, Casto; Cudeiro, Javier (Elsevier, 2009)[Abstract] Compounds known to inhibit or disfacilitate cells in cat dorsal lateral geniculate nucleus (dLGN) were applied iontophoretically in vivo. Application of GABA, or agonists of GABAA and GABAB receptors, markedly ... -
Motor facilitation during real-time movement imitation in Parkinson’s disease: a virtual reality study
Robles-García, Verónica; Arias, Pablo; Sanmartín, Gabriel; Espinosa, Nelson; Flores, Julián; Grieve, Kenneth; Cudeiro, Javier (Elsevier, 2013-08-06)[Abstract] Background: Impaired temporal stability and poor motor unit recruitment are key impairments in Parkinsonian motor control during a whole spectrum of rhythmic movements, from simple finger tapping to gait. Therapies ... -
Receptive field structure of burst and tonic firing in feline lateral geniculate nucleus
Rivadulla, Casto; Martínez Otero, Luis Miguel; Grieve, Kenneth; Cudeiro, Javier (Wiley, 2003-09-12)There are two recognised modes of firing activity in thalamic cells, burst and tonic. A low-threshold (LT) burst (referred to from now on as ‘burst’) comprises a small number of high-frequency action potentials riding the ... -
Responses of primate LGN cells to moving stimuli involve a constant background modulation by feedback from area MT
Jones, Helen E.; Andolina, Ian M.; Grieve, Kenneth; Wang, W.; Salt, T.E.; Cudeiro, Javier; Sillito, Adam M. (Elsevier, 2013-05-03)[Abstract] The feedback connections from the cortical middle temporal (MT) motion area, to layer 6 of the primary visual cortex (V1), have the capacity to drive a cascaded feedback influence from the layer 6 cortico-geniculate ... -
The effects of expectancy on corticospinal excitability: passively preparing to observe a movement
Arias, Pablo; Robles-García, Verónica; Espinosa, Nelson; Corral Bergantiños, Yoanna; Mordillo-Mateos, Laura; Grieve, Kenneth; Oliviero, Antonio; Cudeiro, Javier (American Physiological Society, 2014-01-08)[Abstract] The corticospinal tract excitability is modulated when preparing movements. Earlier to movement execution, the excitability of the spinal cord increases waiting for supraspinal commands to release the movement. ... -
The primate pulvinar nuclei: vision and action
Grieve, Kenneth; Acuña, Carlos; Cudeiro, Javier (Elsevier, 2000)[Abstract] The pulvinar nuclei of the thalamus are proportionately larger in higher mammals, particularly in primates, and account for a quarter of the total mass. Traditionally, these nuclei have been divided into oral ... -
The role of nitric oxide in the transformation of visual information within the dorsal lateral geniculate nucleus of the cat
Cudeiro, Javier; Grieve, Kenneth; Rivadulla, Casto; Rodríguez, R.; Martínez-Conde, Susana; Acuña, Carlos (Elsevier, 1994)[Abstract] We have shown that application of an inhibitor of the enzyme nitric oxide synthase (NOS) effectively suppresses the visual responses of relay cells in the dorsal lateral geniculate nucleus (dLGN) of the anaesthetized ... -
Vasomotion and Neurovascular Coupling in the Visual Thalamus In Vivo
Rivadulla, Casto; Labra, Carmen de; Grieve, Kenneth; Cudeiro, Javier (PLoS ONE, 2011-12-09)[Abstract] Spontaneous contraction and relaxation of arteries (and in some instances venules) has been termed vasomotion and has been observed in an extensive variety of tissues and species. However, its functions and ...