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1. Single units and evoked potentials were recorded in dorsal cochlear nucleus (DCN) in response to electrical stimulation of the somatosensory dorsal column and spinal trigeminal nuclei (together called MSN for medullary somatosensory nuclei) and for tactile somatosensory stimuli. Recordings were from paralyzed decerebrate cats. 2. DCN principal cells(More)
Extracellular, single unit recording techniques were used to measure the responses of posterior lateral line nerve fibers to a 50-Hz dipole source that slowly changed its location along the length of the fish. The flow-field equations for a dipole source were used to model the pressure gradient pattern and thus, the expected excitation pattern along a(More)
Lake Michigan mottled sculpin respond to a chemically-inert vibrating sphere (a dipole source) with an initial orientation towards the source followed by a step-wise progression towards and final strike at the source. An analysis of videotape recordings of this behavior indicate that although pathways to the source varied, they tended to be influenced by(More)
1. Response properties of neurons in the dorsal granular ridge (DGR) of the little skate, Raja erinacea, were studied in decerebrate, curarized fish. Sensory responses included proprioceptive (426 of 952; 45%) and electroreceptive units (526 of 952; 55%). Electroreceptive units responded to weak electric fields with a higher threshold than lower-order units(More)
To test the hypothesis that spatial excitation patterns along the lateral-line system underlie source localization, we videotaped the orientation behavior of blinded mottled sculpin in response to a small dipole source (50-Hz vibrating sphere) before and after unilateral denervation of the lateral line system on different body regions (head, trunk and head(More)
Alternate forms of the steady-state vowel /epsilon/ with second formant peaks located at 1400, 1500, 1700, and 2000 Hz were used to study the representation and discrimination of second formant frequencies at the level of the auditory nerve. Recordings from large populations of auditory nerve fibers in response to these stimuli were used to create(More)
Lake Michigan mottled sculpin (Cottus bairdi) have a lateral-line-mediated prey-capture behaviour that consists of an initial orientation towards the prey, a sequence of approach movements, and a final strike at the prey. This unconditioned behaviour can be elicited from blinded sculpin in the laboratory by both real and artificial (vibrating sphere) prey.(More)
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