Tsutomu Kamada

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1. The echolocative skills ofPteronotus parnellii parnellii andEptesicus fuscus were studied by measuring their ability in avoiding stationary and moving obstacles. 2. The frequency, repetition rate, duration and amplitude of the orientation signals emitted by the bat during three phases of negotiation of obstacles were studied. 3. During the avoidance of(More)
Using free-field acoustic stimulation conditions, we studied the response properties and spatial sensitivity of 146 pontine neurons of the big brown bat, Eptesicus fuscus. The best frequency (BF) and minimum threshold (MT) of a pontine neuron were first determined with a sound broadcast from a loudspeaker placed ahead of the bat. A BF sound was delivered(More)
Microelectrode mapping of the auditory areas in the cerebellar vermis and hemispheres of mustache bats, Pteronotus parnellii parnellii, reveals that a large area of the bat's cerebellum contains units responding to acoustic signals. A study of frequency tuning of isolated units shows that there are two large groups of auditory units. The units of one group(More)
Auditory response properties and directional sensitivity of cerebellar neurons of Eptesicus fuscus were studied under free-field stimulation conditions. The best frequency (BF) and minimum threshold (MT) of a recorded neuron were first determined with a sound delivered in front of the bat. Discharge pattern and MT were studied with both BF stimuli and(More)
Single units (125) which faithfully discharged action potentials to acoustic stimuli (35 ms in duration with 0.5 ms rise and decay times) were recorded in the cerebellar vermis and hemispheres of the CF-FM bat, Pteronotus parnellii. These units had response latencies between 1.5 and 27 ms and minimum thresholds between 2 and 83.5 dB SPL. Best frequencies(More)
Cutaneous digital blood flow (CDBF) during electrical promontory stimulation was measured by laser Doppler flowmetry in 46 tinnitus patients. In patients with tinnitus suppression, CDBF was increased. In contrast, patients in whom treatment did not suppress tinnitus experienced no change in digital blood flow. The cutaneous digital blood flow of patients(More)
1. Electrophysiological properties of 279 single units in the superior colliculus (SC) of the big brown bat,Eptesicus fuscus, were studied by recording their responses to pure tone pulses and frequency-modulated stimuli. 2. The SC units generally fired only a few impulses to acoustic stimulus. They are not tonotopically organized along the dorsoventral axis(More)
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