Assuntos
Membrana Celular/fisiologia , Potenciais da Membrana/fisiologia , Algoritmos , Transporte Biológico/fisiologia , Transporte Biológico Ativo/fisiologia , Difusão , Eletroquímica , Eletrofisiologia , Humanos , Ativação do Canal Iônico/fisiologia , Transporte de Íons , Modelos Biológicos , Modelos QuímicosRESUMO
A digital instrument is described which displays on a three-digit, seven-segment display the average firing frequency of a neuron. Averaging is done over essentially consecutive timing intervals of 1, 2, 5, 10, 20, or 50 s. Provision is made for overflow indication and for manual resetting. The design is simple, economical in the number of integrated circuits used, and may be adapted for measuring the average frequency of occurrence of events other than neuronal firing.
Assuntos
Apresentação de Dados , Eletrônica Médica , Neurônios/fisiologia , Neurofisiologia/instrumentação , Fatores de TempoRESUMO
A digital timer is described which generates a number of pulses whose delays with respect to a periodic reference pulse can be independently preset by means of thumbwheel switches. The timing intervals are crystal-controlled and can be varied over a wide range--typically 0.1 ms to 99.99 s. It is shown how a pulse train of up to 46 pulses may be obtained, the delay of each pulse in the train being individually presettable. Digital integrated circuits are used throughout, except for the output stage of enhanced drive capability.
