Bruck stated that no other forces than the common physical-chemical ones are active within the organism.
Should be studied with physical mathematical methods
Brücke hypothesized the existence of an as yet undiscovered mechanism in the nervous system whose function is to "summate" excitation.
Brücke suggested that the excitation from the stimulus enters the nervous system via a receptor, and then accumulates in a nervous center until a certain threshold is reached. Only then does the center initiate the reflex by discharging its accumulated excitation into the motor nerves.
According to Meynert a "train of thought" is simply the consequence of excitation flowing through a series of cortical cells that have been associated because of previous simultaneous excitations.
Every person, of course, has a unique pattern of experience and so develops a unique pattern of cortical associations that represent his memories. These associations are the anatomical substrate of a person's "individuality," and Meynert referred to them collectively as the ego (German Ich).
Meynert also believed that the associations of an adult ego could be temporarily or permanently weakened, with a similar result of random or confused thought processes.
Toxic conditions in the brain can produce a more permanent ego weakness, resulting in psychotic states.
Freud assumes that certain cortical neurons are the anatomical equivalents of ideas and memories.
He calls these neurons, collectively, the Psi system.
Cathexis of a Psi neuron by Q is equivalent to the excitation of the idea it represents, and such excitation may occur to varying degrees, depending on the extent of the cathexis.
He was first to draw neural networks
Donald Hebb Stated that if two or more neurons fire together then the connection between them is strengthened the opposite is also valid if the connection between neurons are strong they tend to be activated together.
With repetitive experience connections strengthen forming Hebbian cell ensembles. These ensembles can represent the experience which has strengthened their connections.
See also:
http://neuroanalysis.googlepages.com/ernestbruck%2Ctheodoremeynert%2Csigmundfreud