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Biomedical subjects

A Trehub

Publications and source records attributed to A Trehub.

14 recordsLinked to original sources
PubMed1973

Stimulus intensity and modulation of brain output.

In accordance with the implications of a previously proposed mathematical model of modulation of bioelectric response in the brain, it is found that a single free coefficient predicts the observed modulation periods over a range of stimulus intensities. This coefficient is shown to be a computable function of stimulus intensity. Change in the mean modulation period of evoked bioelectric output at the visual cortex of the rat can be described as a power function of the intensity of photic stimulation.

Animals↗
PubMed1971

The brain as a parallel coherent detector.

Knowledge of the bioelectric signal-to-noise ratios in rat brain makes it possible to demonstrate for the first time that the brain functions as a coherent signal detector, an important class of detectors that are explicitly formulated within the statistical theory of communication. Within an afferent neuronal channel of a single modality, the brain functions as a parallel signal processor.

Animals↗
PubMed1969

A Markov model for modulation periods in brain output.

A theoretical model is proposed to explain the modulation of bioelectric brain output and its temporal characteristics. The model assumes a time series based on a Markov process with transition probabilities generated by a negative exponential function. One parameter is estimated. Computer runs of the theoretical model compare well with empirical findings.

Brain↗
PubMed1967

An inexpensive electro-fistular swivel for negative feedback control of self-stimulation.

A swivel was developed for concurrent intraorganismic fluid injection and intracranial electrical stimulation of the unrestrained rat. Effects of various intragastric injections on bar-pressing maintained by electrical stimulation of the hypothalamus were studied. In some subjects, intragastric injections of either water or milk decreased the rate of responding. This decrease resulted from pauses in responding rather than from decreases in the local rates of responding. The decrement in responding occurred at a lower gastric volume during milk injection than during water injection. In other subjects, however, neither water, milk, nor 32% sucrose injections affected the rate of self-stimulation.

Animals↗