Variable binding by synaptic strength change

Figures & data

Figure 1. Idealised binding with bind node: initial binding of red and square is later replaced by blue binding with circle.

Figure 2. Sample neural firing pattern for red-square and blue-circle.

Figure 3. Topology of intra-subnet connections in the compensatory LTP binding simulation: each neuron in the base subnets connect to the bind subnet, and each neuron in the bind subnet connects to the base subnets.

Table 1. Network constants.

Name	Symbol	Base net	Bind net
Threshold	θ	4	7
Decay	D	1.5	5
Fatigue	F c	1.0	1.0
Fatigue recovery	F r	2.0	2.0
Saturation base	W B	21	28
Compensatory base	P	1.3	1.3

Figure 4. Neurons firing per cycle indicating CA formation.

Figure 5. Effect of binding period on binding.

Figure 6. Duration of bindings via STP varying by reduction rate and time to bind.

Figure 7. Gross topology of the simulation of binding with frames. The rule subnet inhibits the slots of the frames that are not active, and the slots are bound to the appropriate verbs and nouns via STP.

Figure 8. Firing of neurons showing synchronisation while binding.

Figure 9. Firing of neurons showing synchronisation of items bound by STP.

Table 2. Binding property values by method.

	Persistence	Number	Speed
Synchrony	While firing	Few	Fast
Active links	While firing	Large	Fast
STP	Moderate	Large	Fast
LTP	Long	Large	Slow

Figure 10. Memory hierarchy: different binding mechanisms provide a possible answer for the wide range of memory duration CAA, CA activation; BSyn, binding via synchrony; AL, binding via active links; BSTP, binding by STP; BLTP, binding by LTP; CAF, CA formation.