Yukimasa Shiraishi

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The nucleus basalis of Meynert (nbM, substantia innominata) in the basal forebrain provides a single major source of cholinergic innervation for the entire cerebral cortex. We tested the effects of nbM lesions on rabbit P300-like potentials. The P300-like event-related potential (ERP) was recorded in 14 female adult white rabbits using a conventional(More)
This study examines the nature of the efferent projection of omnipause neurons (OPNs) in the midline pontine tegmentum to medium-lead burst neurons (BNs) in the Forel's field H (FFH), both of which exhibit activities related to vertical eye movements, using chronically prepared alert cats. Antidromic spikes of the BNs evoked by oculomotor nucleus(More)
Expression of GABA(A) receptor (GABA(A)R) alpha(1), alpha(2), beta(2), gamma(1), gamma(2L) and gamma(2S) subunit mRNA was examined in three cell classes in the central nucleus of the rat inferior colliculus (CNIC). GABA(A)R alpha(1) and gamma(2L) subunit mRNA expression was greatest in large cells (over 25 microm long diameter), intermediate in medium sized(More)
The present study was undertaken to investigate the firing patterns, location and projections of vertical eye movement-related neurones in the Forel's field H (FFH), the interstitial nucleus of Cajal (INC), and reticular formation of the mesodiencephalic junction (MDJ) in chronically prepared alert cats. A total of 456 neurones in the medial MDJ with firing(More)
This study investigated the nature of synaptic inputs from the Forel's field H (FFH) in the medial mesodiencephalic junction to inferior oblique (IO) motoneurons in the oculomotor nucleus and superior oblique (SO) motoneurons in the trochlear nucleus in anesthetized cats, using intracellular recording techniques. Stimulation of the FFH induced monosynaptic(More)
In cerebral ischemia of different degrees, the amplitudes of somatosensory evoked potentials (SEPs) are facilitated or depressed. Different mechanisms might be responsible for the explanation of the contradictory phenomena. SEPs obtained using the paired stimulation method were employed in trying to find out the role of the functional changes of the(More)
This study explores neurons in the medial midbrain tegmentum of cats projecting directly to the medial rectus subdivision of the oculomotor complex, using antidromic microstimulation techniques. Many of these neurons were located in areas just lateral and dorsal to the oculomotor complex, e.g. in the medial part of the midbrain reticular formation and(More)
Normal expression and deafness related changes in expression of NMDAR1 isoforms were examined in the rat superior olivary complex (SOC) using in situ hybridization with S35 labeled oligoprobes. Expression was assessed in three SOC nuclei, the lateral and medial superior olives (LSO, MSO) and the medial nucleus of the trapezoid body (MNTB). Silver grain(More)
Excitatory inputs to neurons in the Forel's field H (FFH) related to visually induced vertical saccades from the ipsilateral superior colliculus (SC) were investigated in chronically prepared alert cats. By stimulation of the deep or intermediate layer of the SC, upward augmenting neurons (ANs) and one long-lead downward burst neuron (BN) were found to be(More)
Spikes of single neurons related to vertical eye movements and vertical head rotation were recorded extracellularly in the medial mesodiencephalic junction (MDJ) of chronically prepared alert cats, and their antidromic responses to stimulation of the pontine reticular formation (PRF) were studied. Among the vertical eye movement-related-neurons, augmenting(More)