Historical Context: From Synchrony to Form Change

11 Historical Context: From Synchrony to Form Change

11.1 Pioneering work on neural binding

The question of how the brain integrates the distributed features of a stimulus into a unified representation was significantly shaped in the second half of the 20th century by the work of Wolf Singer, Christoph von der Malsburg and Ulrich Ramacher. These researchers recognised early on that neural representation is not a static state, but a dynamic process expressed in the temporal activity of large networks of neurons.

Their key observation was:

Neurons belonging to a common object exhibit temporally synchronous activity.
This synchrony was interpreted as a mechanism of binding.

This view was far ahead of its time. It required a deep understanding of signal processing, networks and dynamics — and it was a decisive step towards a systems-theoretical view of the brain.

11.2 Synchrony as an observed phenomenon

Looking back, it can be stated that:

Temporal synchrony does indeed exist.
It can be reliably measured.
It occurs in many sensory and cognitive processes.
It correlates with the integration of distributed features.

Synchrony thus provided an important empirical window into the dynamics of the brain.

Yet the question remained:

Is synchrony the mechanism of binding — or merely its visible accompanying phenomenon?

11.3 Complex signals and the debate over grandmother cells

In earlier work, it was proposed that the brain generates complex signals — well-ordered sets of elementary signals that together represent a form. Singer viewed this concept critically, as he saw the danger of thereby introducing a kind of ‘grandmother cell’.

This criticism was justified if complex signals are understood as individual neurons.

However, from the signal-theoretical perspective presented here, the following applies:

A complex signal is not a single neuron,
but a vector,
an ordered set of activities,
a distributed pattern.

This resolves the debate:

There is no ‘grandmother cell’.
But there are complex forms that act like grandmother cells — without being localised.

Singer was therefore right to reject the grandmother cell. And at the same time, the concept of complex signals is correct — if understood in a vectorial sense.

11.4 Synchrony as an epiphenomenon of form change

The theory developed here shows:

The direct system generates complex forms.
The inverse system breaks them down again into elementary forms.
Non-linearity stabilises states.
Recursion repeats this cycle.

This results in an oscillatory alternation between:

This oscillation is arithmetically necessary and generates:

rhythmic activity,
temporal coherence,
synchrony.

This makes it clear:

Synchrony is not the mechanism of binding, but the visible epiphenomenon of the change in form.

Singer observed the phenomenon. Signal-theoretical architecture explains the mechanism.

11.5 The present: A more precise systems-theoretical perspective

From today’s mathematical and signal-theoretical perspective, it can be said:

The classical works were empirically brilliant and theoretically groundbreaking.
They described the dynamics of the brain at the level of observation.
The theory presented here describes them at the level of arithmetic necessity.

This brings us full circle:

Singer, von der Malsburg and Ramacher saw the signature of the change in form.
The signal-theoretical architecture reveals the cause of the change in form.

The present allows us to integrate both perspectives.