This model is part of wider Dichotic theory of salience, according to which a stimulus is salient either when it is incongruent in a certain context to a perceiver's schema, or when it is congruent in a certain context to a perceiver's goal.
âThat first day in the Hayden Planetariumâ¦I looked up, the lights dimmed and stars came out, and I was called by the universe. I had no choice in the matter,â he says. From then on, Neil was determined to become an astrophysicist, someone who studies the stars and universe. He saved up for a telescope and spent his evenings studying the night sky on city rooftops. His stargazing habits were not necessarily well received however, as his neighbors would often report him for suspicious behavior.
An early recognized function of astrocytes is the control of K + levels in the brain. Neuronal activity leads to an increase in K + concentration from a resting level of about 3 mM to a maximum of 10 - 12 mM under physiological conditions and to even higher values under pathological conditions.strocytes may also limit the number of synapses since astrocyte membranes can ensheath the neuronal processes and thus compete with synapses. Astroglial cells can also be involved in the elimination of synapses in the CNS, the process which underlies the final tuning and plasticity of the neuronal inputs.