Presentation is loading. Please wait.

Presentation is loading. Please wait.

Heinz, G.: Waves on Wires – Introduction to Interference Networks n What "Integrate and Fire" suggests n Interference Principle, I.- Networks n 1D-, 2D-,

Similar presentations


Presentation on theme: "Heinz, G.: Waves on Wires – Introduction to Interference Networks n What "Integrate and Fire" suggests n Interference Principle, I.- Networks n 1D-, 2D-,"— Presentation transcript:

1

2 Heinz, G.: Waves on Wires – Introduction to Interference Networks n What "Integrate and Fire" suggests n Interference Principle, I.- Networks n 1D-, 2D-, 3D- Projections n Interference Integrals n I.-Types: Self-I., Cross-I. n Self-I. (Zoom, Movement, Somato-t. Maps) n Cross-I. (Spatio-Temporal Maps) n Mixed S/C (Lashleys rats, I.-overflow) Author: Dr. Gerd Heinz, GFaI, 12489 Berlin Albert-Einstein-Str. 16, Floor 5, Room 12B www.gfai.de/~heinzwww.gfai.de/~heinz www.acoustic-camera.com heinz@gfai.de www.acoustic-camera.comheinz@gfai.de www.gfai.de/~heinzwww.acoustic-camera.comheinz@gfai.de

3 22/09/05Israel Lectures © G. Heinz, www.gfai.de/~heinz2 History n 1992 Introducing velocities and spikes into a (weighted) neural network I found a symmetry, a mirror property (in -> out map) http://www.gfai.de/~heinz/historic/index.htmhttp://www.gfai.de/~heinz/historic/index.htm (slide 9) http://www.gfai.de/~heinz/historic/index.htm n 1993 book "Neuronale Interferenzen": new principles and properties (zooming, movement, overflow, spatio-temp. maps) http://www.gfai.de/~heinz/publications/NI/index.htm n 1994 - 98 Development of simulator 'PSI-Tools' for simulation of nets and for nerve- and acoustic experiments PSI-Tools n To demonstrate the qualities of the approach: acoustic images, acoustic movies (1994-96, first in the world) 1994-96, first in the world1994-96, first in the world n 1996 introduction of the term 'interference networks (IN)' characterizing the 'physical approach to neural networks (NN)' n Reason: Very different properties to weighted/pattern- NN's n 2004 International market entry with Acoustic Cameras n 2001, 2003, 2005 Awards for acoustic photo- and cinematography (www.acoustic-camera.com) 200120032005www.acoustic-camera.com 200120032005www.acoustic-camera.com n Extract: http://de.wikipedia.org/wiki/Interferenznetzwerk http://de.wikipedia.org/wiki/Interferenznetzwerk

4 22/09/05Israel Lectures © G. Heinz, www.gfai.de/~heinz3 Abstraction Interference Networks n Term 'interference': superimposition of waves n Discrete 'waves on wires' n Spherical, 3-dimensional architecture Moving time functions (spikes) f(t- ) Moving time functions (spikes) f(t- ) –spike-duration (geom. pulse length) –refractory behaviour (pause) n Branch-delays (and -velocities) n Connectivity (spines, synapses) n Overlay operations (add, multiply…) n Computational problem: high number of branches branch

5 22/09/05Israel Lectures © G. Heinz, www.gfai.de/~heinz4 Central Question: Relativity of Wave Length n Spikes move slowly through nerve system [2 µm/s … 120 m/s] n Spikes have a limited (geometric) size [µm … cm] n Velocity v, pulse duration T, grid g, geometrical wavelength s = v. T s gInterference network s >> gPool of neurons (NN.) s [µm] g [µm] Which proportion is truth? Which grid is addressed? Spines?Spines? Cell bodies?Cell bodies? Columns?Columns? It depends?It depends?

6 22/09/05Israel Lectures © G. Heinz, www.gfai.de/~heinz5 What "Integrate and Fire" suggests The probability to excite a neuron is higher as more closed the partial impulses can reach it (Heinz, NI, 1993) random: no excitement synchronous: fire

7 22/09/05Israel Lectures © G. Heinz, www.gfai.de/~heinz6 Projection Law (Heinz'93) n Waves need to be at the detecting place at the same time Self interference condition (all paths): … Self interference condition (all paths): … Self interference condition Self interference condition n Velocities and path length can be different, but delays can not n Applied into optics, GPS, acoustic camera, dig. filter theory n Different to classic approaches (Fermat, Huygens … Feynman)

8 22/09/05Israel Lectures © G. Heinz, www.gfai.de/~heinz7 Classic Beam-Approach of Optics n Light way (beam) defined by a minimum of a path integral (Fermat, Huygens, Maupertuis, Newton, Euler, Lagrange, Hamilton, Leibniz, Jacobi, Helmholtz, Maxwell, Heisenberg, Schrödinger, Feynman) n Fermat: Minimum principle, shortest way of light n Huygens, Maupertuis: smallest action, wave theory q2q2q2q2 q1q1q1q1 q(t) Lagrange function = (T-V); T kinetic, V potential energy (compare H. Lübbig 1998, W. Kuhn 2001) water air min. path

9 22/09/05Israel Lectures © G. Heinz, www.gfai.de/~heinz8 drawing: d. doebler The Forgotten Symmetry: First Inter-Medial Interference Circuit Tyto alba Sound localization model Sound localization model based on: Jeffres L. A.: A place theory of sound localization. J. Comp. Physiol. Psychol. 41 [1948]: 35-39 symmetry line: mirror right left

10 22/09/05Israel Lectures © G. Heinz, www.gfai.de/~heinz9 1-dimensional Interference Projection (Heinz 1992) n Signals meet at locations with identical delays from source (self-interference) n (all other cases not drawn) n Specific neurons begin to communicate n Address relations between locations given by delays n Time codes location Single point observations look like density modulated signals or bursts?

11 22/09/05Israel Lectures © G. Heinz, www.gfai.de/~heinz10 3-dim. Interference Projection n Considered generating and detecting fields n Which properties exist between generating and detecting locations?

12 22/09/05Israel Lectures © G. Heinz, www.gfai.de/~heinz11 3-dim. Interference Projection n Considered generating and detecting fields n Which properties exist between generating and detecting locations? n To find answers we arrange the spiking neurons n Mirrored projection appears as "interference integral" n Image conjunction!

13 22/09/05Israel Lectures © G. Heinz, www.gfai.de/~heinz12 pixel grid = neurons grid Understanding the Wave Abstraction n Each neuron has different delays to source points n For didactic purposes we use some abstractions: –homogeneous velocity –equidistant neurons (as pixels of an image) n Detecting field is a bitmap of pixels (symbolizing neurons) pixel x y z neurone 3 2 1 3d- source points

14 22/09/05Israel Lectures © G. Heinz, www.gfai.de/~heinz13 Understanding Gen.- and Det.- Masks n Each locations has its own time scheme, has its own mask Mask of a location Inverse Mask

15 22/09/05Israel Lectures © G. Heinz, www.gfai.de/~heinz14 2-dim. Wave Field Simulation If we consider all possible paths, any emission is on a circle of delay around any source: we call it 'wave' If we consider all possible paths, any emission is on a circle of delay around any source: we call it 'wave' n I² are composed of waves n Didactic suggestions: –homogeneous wave expansion –Linear superimposition (?!) Interference integral over the whole wave field: Wave field (pixels symbolize neurons) 30 channel simulation (Hz 1995)

16 22/09/05Israel Lectures © G. Heinz, www.gfai.de/~heinz15 Quotation n "Your file gfai_30_.avi (GFaI-movie) reminds me of a trapped wave packet scattered inside a chamber. It also reminds me of ray tracing inside an inhomogeneous wave duct where one can compute the wave trajectories using Snell's law. So I understand that interference effects can be computed using geometry (the propagation path as a function of space and time) instead of wave mechanics. Feynman used the path integral approach to build up a sum of probabilities for quantum trajectories instead of using the Schrodinger wave equation." Glenn Takanishi, www.neuralmachines.com (Hawai) www.neuralmachines.com

17 22/09/05Israel Lectures © G. Heinz, www.gfai.de/~heinz16 A Detailed Look to Interference of Discrete Waves n Excitement values becomes maximized at locations, where most waves meet n Not all, only some places have a chance to be excited n Timing codes the location of possibilities Image pixels seen as nerve cells with connections Homogeneous wave velocity and space for demonstration only (neuro-pile)

18 22/09/05Israel Lectures © G. Heinz, www.gfai.de/~heinz17 Self- /Cross- Interference Relations Waves meet itself -> self-interference: wave i with i with i …Waves meet itself -> self-interference: wave i with i with i … Waves meet other waves -> cross-interference: wave i with i-1 …Waves meet other waves -> cross-interference: wave i with i-1 … (i, i, i, i) self-interference location (i, i, i, i) self-int. (i, 0, i-1, i) cross-int. location (1) (3) (2) (4) cross- interference distance

19 22/09/05Israel Lectures © G. Heinz, www.gfai.de/~heinz18 2-dim. Waves on Squids n Andrews squid-experiments (1995) show moving excitations between chromatophore-cells n Cells are connected via a nerve-like structure n Excitation and relaxation can produce waves n Time functions appear comparable to nerve n Although the mechanism is not exactly known, the effect needs a wave-interference description http://www.gfai.de/~heinz/historic/biomodel/squids/squids.htm Circular wave

20 22/09/05Israel Lectures © G. Heinz, www.gfai.de/~heinz19 Local Interaction n Waves delete in the refractoriness zone 'cleaning waves' 'cleaning waves''cleaning waves' n Analogy to frogs sciatic-nerve experiments (Ischias) frogs sciatic-nerve experiments frogs sciatic-nerve experiments n Refractory distance >> field size http://www.gfai.de/~heinz/historic/biomodel/squids/squids.htm "cleaning" waves on squids (AP, 1995) Global, linear Local, non-linear "cleaning" waves in 2-dim. simulation

21 22/09/05Israel Lectures © G. Heinz, www.gfai.de/~heinz20 Interference Integrals (Self-I., Visual Maps) n Long time-integration pulls up the energy of wave-hit-locations (self interference locations) n Source arrangement defines the maps n Maps can be conjunctive (g+h) Detecting fields Generating fields (g+h) time function plot

22 Summary Chapter "Self Interference" Self interference increases the excitability of a neuron Self interference increases the excitability of a neuron Self interference properties define 'mirrored projections' Self interference properties define 'mirrored projections' The term 'wave' abstracts a two- or higher dimensional movement of many spikes through any delaying space The term 'wave' abstracts a two- or higher dimensional movement of many spikes through any delaying space It is not possible to interpret anything, if we observe only one channel of a projection It is not possible to interpret anything, if we observe only one channel of a projection Timing defines the location: Only wave addressed neurons can learn Timing defines the location: Only wave addressed neurons can learn Self interference is very sensitive against any parameter drift, circuits need auto-control and regulation (-> Hebb's rule in a different light) Self interference is very sensitive against any parameter drift, circuits need auto-control and regulation (-> Hebb's rule in a different light) Local superimposition needs 'cleaning waves' before any neuron can be addressed Local superimposition needs 'cleaning waves' before any neuron can be addressed

23 22/09/05Israel Lectures © G. Heinz, www.gfai.de/~heinz22 Cross-Interference n All channels with identical time functions n Cross interference distance: ds = v dt = v / f with f = 1/dt n "Spatio-temporal coding", temporal maps Huygens double split experiment for neurons (NI 1993): Heinz 1993 (i, i, i, … i) self- interference location (i, i+1, i-1 … ) cross-interference locations (around)

24 22/09/05Israel Lectures © G. Heinz, www.gfai.de/~heinz23 Cross-Int. Integrals: "Spatio-Temporal Maps" n Cross interference defines all temporal maps n We consider identical, periodical fire on all channels n Cross interference is maximum for two channels -> which channel number has the auditory system? Only two? n We like 'harmony' in sound n 'Harmonies' address similar points

25 22/09/05Israel Lectures © G. Heinz, www.gfai.de/~heinz24 Summary "Frequency Maps" n Cross interference defines all temporal maps n Increasing channel number (2…8) reduces cross interference intensity (due to over-conditioning) Heinz 1996 (i, i, i, … i) self- interference locations cross-interference locations around

26 22/09/05Israel Lectures © G. Heinz, www.gfai.de/~heinz25 n Lashley was looking his life long for the locality of items learned (1920 … 1950) n Rats became teached a way through a labyrinth. He removed systematically small parts of the brain and proved the before learned Summary of his experiments: n The series of experiments... has discovered nothing directly of the real nature of the engram Interpretation: n Cross interferences look like self interferences (!) n "Tutographic" brain, if it is an interference system n We can not avoid the duality Self- and Cross- Interference Interaction Region of cross-interferences around Region of self-interference 3-channel Simulation

27 22/09/05Israel Lectures © G. Heinz, www.gfai.de/~heinz26 1-dim. Delay Shifter Modulates Wave Front n Variation of relative delay changes wave direction n Glia can modulate the velocity of nerves http://www.gfai.de/~heinz/publications/NI/KA04.pdf

28 22/09/05Israel Lectures © G. Heinz, www.gfai.de/~heinz27 Delay Shift Moves Integrals n Variation of delay of one channel produces a moving interference integral (glia potential influences speed & location)

29 22/09/05Israel Lectures © G. Heinz, www.gfai.de/~heinz28 1-dim. Velocity Variation Modifies the Size n Variation of velocity (v, v' ) influences the size of a projection http://www.gfai.de/~heinz/publications/NI/KA04.pdf

30 22/09/05Israel Lectures © G. Heinz, www.gfai.de/~heinz29 Velocity Variation Zooms Integrals n Variation of background velocity in the detecting field zooms the interference integrals (neuroglia) n Cross interferences appear for low velocities

31 22/09/05Israel Lectures © G. Heinz, www.gfai.de/~heinz30 A Closer Look to Memory Density n As slower is the velocity in the detecting field, as smaller is the addressable region, as higher is the density and the addressable memory volume n If we ask "How do you do?", we get different answers: –Professor: (pause) "ohhhh" (pause) "don't know?" –Tennis profi: "Oh fine, I won the mastership!" n Who is who? v = 50 [mm/s] v = 10 [mm/s]

32 22/09/05Israel Lectures © G. Heinz, www.gfai.de/~heinz31 Heinz 1993 Zooming & Movement for Pattern Matching n To recognize a person or face, we have to "scale" the image to the same size and position (zooming and movement) n Our eyes have no optical zoom n Adoption with electronic scaling? path: retina to visual cortex? n (Comparable task for somato-topic projections in Homunculus) + = ? + = match!

33 22/09/05Israel Lectures © G. Heinz, www.gfai.de/~heinz32 Rule of Fire Rate n Cross interference pattern depends on channel number & refractory period n We increase the average fire rate (reduced cross- interference distance) n Field overflow occurs: Cross interference overflows the self-interf., loss of information! n Hypothesis: if pain is cross interference overflow, then this simple interference circuit models that behaviour ~ 7,5 ms ~ 5 ms ~ 4 ms ~ 1,5 ms

34 22/09/05Israel Lectures © G. Heinz, www.gfai.de/~heinz33 n "Interference integral" = integration of time function of each location over time 1. Self-interference properties define –Somato-topic maps (mirrored projections) –Noise location (owl, dolphin) –Optical pictures, Acoustic Camera –Scaling (zoom, movement) 2. Cross-interference properties define –Frequency maps –Code and behavior maps –Pain? Summary: Spatio-Temporal Maps (Self- and Cross Interference Integrals)

35 22/09/05Israel Lectures © G. Heinz, www.gfai.de/~heinz34 Analogy to Filter Theory n Neuron changes from a simple threshold gate to a digital filter circuit n Direct translation into digital filter structure is possible Distributed wire with delay Electrical node (!) Its a digital filter circuit!

36 Applications & Research Author: Dr. Gerd Heinz, GFaI, 12489 Berlin Albert-Einstein-Str. 16, Floor 5, Room 12B www.gfai.de/~heinzwww.gfai.de/~heinz www.acoustic-camera.com heinz@gfai.de www.acoustic-camera.comheinz@gfai.de www.gfai.de/~heinzwww.acoustic-camera.comheinz@gfai.de

37 22/09/05Israel Lectures © G. Heinz, www.gfai.de/~heinz36 Applied Interference Systems n Radar (electric waves) n Optics (electric waves) n Sonar (acoustic waves) n Acoustic cameras (ac. waves) n Digital filter theory (!) n Digital logic (computers) n Pattern- and Weight-Nets (Neuronal Networks) n Fuzzy logic n Global Positioning by Satellites n Cell phone carrier multiplex n Interferential bio-interaction (brain memory extension …) n Integral Transformations (!): convolution, correlation, FFT… … only the type of time function changes (floating/integer/binary)

38 22/09/05Israel Lectures © G. Heinz, www.gfai.de/~heinz37 Bio-Neuro-Research n Data addressing –Refractoriness and bidirectional exchange –Geometrical wave length –Cleaning waves (non-linear superimposition) n Data processing –Temporal correspondence of arrangements –Data compression & segmentation –Interference learning, self-organisation n Spatial projectivity –High channel numbers? Field size contra channel number n Cross-interference properties (temporal selectivity) –Creating behaviour –Relations between net geometry and behaviour n Technical Applications –Wave cameras: acoustic, electric, ultrasonic –Mobile cell phone nets –Space-Time Filters

39 22/09/05Israel Lectures © G. Heinz, www.gfai.de/~heinz38 Homepage http://www.acoustic-camera.com/ http://www.acoustic-camera.com/ microphone array (32 mics)data recordernotebook Vacuum cleaner Vacuum cleaner Vacuum cleaner Vacuum cleaner Sports car Sports car Sports car Sports car Needle printer Needle printer Needle printer Needle printer Application Acoustic Camera

40 Conclusion We considered nerve nets to be discrete wave interference networks We considered nerve nets to be discrete wave interference networks An amazing amount of new questions, possibilities and directions appear An amazing amount of new questions, possibilities and directions appear Interdisciplinary co-operation can accelerate findings Interdisciplinary co-operation can accelerate findings Thanks for your attention! Author: Dr. Gerd Heinz, GFaI, 12489 Berlin Albert-Einstein-Str. 16, Floor 5, Room 12B heinz@gfai.deheinz@gfai.de www.gfai.de/~heinz www.acoustic-camera.com www.gfai.de/~heinzwww.acoustic-camera.com heinz@gfai.dewww.gfai.de/~heinzwww.acoustic-camera.com Hyperbolic projection 16-chnl. pulse waves

41 22/09/05Israel Lectures © G. Heinz, www.gfai.de/~heinz40 Related Links Homepage http://www.gfai.de/~heinz/ Publication-Directory http://www.gfai.de/~heinz/publications/index.htm Historical http://www.gfai.de/~heinz/historic/index.htm Acoustic Camera http://www.acoustic-camera.com Die Wahrheit triumphiert nie, ihre Gegner sterben nur ausDie Wahrheit triumphiert nie, ihre Gegner sterben nur aus Max Planck

42 Thanks Thanks to Benny Hochner (Hebrew Univ. Jerusalem), Tamar Flash (Weizmann Inst. Rehovot) and Mosche Abeles (Bar-Ilan Univ. Ramat Gan) for invitation, talks and discussions. Thanks to my wife Gudrun. She helped me over years of missing acknowledgements without doubt. Israel 27.9.-6.10.2005 Gerd Heinz Author: Dr. Gerd Heinz, GFaI, 12489 Berlin Albert-Einstein-Str. 16, Floor 5, Room 12B www.gfai.de/~heinzwww.gfai.de/~heinz www.acoustic-camera.com heinz@gfai.de www.acoustic-camera.comheinz@gfai.de www.gfai.de/~heinzwww.acoustic-camera.comheinz@gfai.de

43 More Theory n Add on's Author: Dr. Gerd Heinz, GFaI, 12489 Berlin Albert-Einstein-Str. 16, Floor 5, Room 12B www.gfai.de/~heinzwww.gfai.de/~heinz www.acoustic-camera.com heinz@gfai.de www.acoustic-camera.comheinz@gfai.de www.gfai.de/~heinzwww.acoustic-camera.comheinz@gfai.de

44 22/09/05Israel Lectures © G. Heinz, www.gfai.de/~heinz43 Interference Conditions in Detail n Generating Mask M, detecting (inverse) Mask M* M + M* = T all ways have the same delay" (Hz'93) n Cross interference: … plus /minus foregoer/follower"

45 22/09/05Israel Lectures © G. Heinz, www.gfai.de/~heinz44 Understanding Bursts n Circuit (a) n Burst generation with low bias (b) n Code detection with high bias (c) n Data addressing possibility -> Example

46 22/09/05Israel Lectures © G. Heinz, www.gfai.de/~heinz45 Summary: New Elementary Functions of Neuron n Code generation n Code detection n Data addressing n Neighborhood inhibition (for identical neurons) n Level generation (spike duration > refractoriness zone) http://www.gfai.de/~heinz/historic/biomodel/models.htm#bursts http://www.gfai.de/~heinz/publications/papers/2002_NF.pdf Sources: NI 1993 NI 1993 SAMS 1994 SAMS 1994 BioNet 1996 BioNet 1996

47 22/09/05Israel Lectures © G. Heinz, www.gfai.de/~heinz46 Inhomogenity and Over-Conditioning n A one-dimensional projection needs two channels n A two-dimensional projection needs three channels n (the system is called 'over-conditioned', if more channels match)... n For a n dimensional projection d we need n+1 channels d = n+1 n How to realize high dimensions? –Distorted, folded space –Diameter (velocity) variation of dendrites –Non-linear wiring -> Inhomogeneous delay-spaces http://www.gfai.de/~heinz/publications/papers/2002_NF.pdf

48 22/09/05Israel Lectures © G. Heinz, www.gfai.de/~heinz47 Circuit Drawings n The way to draw circuits for space and time: intrinsic delay n Wires are not nodes!!! n General: limited velocity Distributed wires with delay

49 22/09/05Israel Lectures © G. Heinz, www.gfai.de/~heinz48 Colored Interference Systems n Nerves diameter vary, different carrier mechanisms n Waves can meet

50 22/09/05Israel Lectures © G. Heinz, www.gfai.de/~heinz49 Scene Representation and Information Reduction n Delay learning can compose single points, representing whole scenes n Example: 30 neurons "GH" can be represented using only 3 interference locations Source 16-chnl. destination

51 22/09/05Israel Lectures © G. Heinz, www.gfai.de/~heinz50 Overlays of I² n Axial (different generators and/or detectors on one 'bus') Radial (the delay geometry stays identical by add. of +/- ) Radial (the delay geometry stays identical by add. of +/- ) http://www.gfai.de/~heinz/publications/papers/1994_SAMS.pdf

52 22/09/05Israel Lectures © G. Heinz, www.gfai.de/~heinz51 Permutation and Decomposition of Scenes n Down: high dim. scenes can be decomposed to lower dimensions n Up: low dim. scenes can create higher dim. scenes using hyperbolic image overlays (without synchronization) n Examples: –Down: P1234 decomposes in P12, P23, P34, P41, P123, … P412 –Up: P12, P23, P34, P41 compose independent hyp. projections n Information reduction n A complex scene can be stored by (the position) of one neuron n "Complex neurons" n Neurons create behavior

53 22/09/05Israel Lectures © G. Heinz, www.gfai.de/~heinz52 Projection contra Reconstruction n Natural time runs only in one direction: –Projection –Mirror property (!) n Computer time can run back –Reconstruction –Non-mirrored (!) –For technical purposes (AK) –Pseudo-wave-field problem n the direction of time axis defines the difference between them Reconstruction Projection

54 22/09/05Israel Lectures © G. Heinz, www.gfai.de/~heinz53 Heinz Interference Transformation

55 22/09/05Israel Lectures © G. Heinz, www.gfai.de/~heinz54 n We have to live with a small number of channels n Any time-function recorded by a sensor (microphone, electrode) has lost the wave-field information n In reconstruction it produces a new wave field (secondary wave field) n This is complete different to the original wave field n But we have to work with! Secondary Wave Field Original Wave Field Recording Sensor Emission Understanding Primary and Secondary Wave Fields x z y

56 22/09/05Israel Lectures © G. Heinz, www.gfai.de/~heinz55 Source wave-frontwave-back Virtual Waves (I.-Reconstruction) 3 2 1 pos. direction of time Orig. WF P 3 2 1 pos. time Sec. WF n Recording channels come out of the sensors -> spherical waves n Time flow shows waves with wave- front direction to the center! (Hz'96) Example of secondary wave field with inverted waves

57 22/09/05Israel Lectures © G. Heinz, www.gfai.de/~heinz56 Time across Space n Projection: continuous time n interference integral appears mirrored n Reconstruction: inverse time n Interference integral appears non-mirrored dT template Mirrored projection Primary field Secondary field Interference Projection f(t-T) template Interference Reconstruction f(t+T) Inverse time n Optical lense systems, Sonar n Nerve systems (!) n Beamformíng with delay elements n Fink "Time Reversal Mirrors" n Acoustic Camera Max. delay

58 22/09/05Israel Lectures © G. Heinz, www.gfai.de/~heinz57 Calculation n Interference- Transformation (HIT) n "Interference Projection" published in BioNet96 n First acoustic image 1994 used the Interference- Transformation (HIT) as "reconstruction" (not published) http://www.gfai.de/~heinz/publications/papers/1996_Bionet.pdf

59 Bio-Models Author: Dr. Gerd Heinz, GFaI, 12489 Berlin Albert-Einstein-Str. 16, Floor 5, Room 12B www.gfai.de/~heinzwww.gfai.de/~heinz www.acoustic-camera.com heinz@gfai.de www.acoustic-camera.comheinz@gfai.de www.gfai.de/~heinzwww.acoustic-camera.comheinz@gfai.de

60 22/09/05Israel Lectures © G. Heinz, www.gfai.de/~heinz59 Heinz93 Source: Heinz, Neuronale Interferenzen 1993 A Wave Model for Penfields Homunculus... n A hyperbola defines a fixed delay difference to two points F, F' n Different hyperbolas define different delay differences a/a', c/c' n Pulses meet at different locations, see drawing n (Self-I. location is defined by wave front direction)

61 22/09/05Israel Lectures © G. Heinz, www.gfai.de/~heinz60 Thumb Experiment n Waves can be inspected with NLG n We find moving body projections n Orthogonal arrangements? Interpretation: Arrangement: Result:

62 22/09/05Israel Lectures © G. Heinz, www.gfai.de/~heinz61 Homunculus and the Thumb Experiment n Motion moves projections dependent of position, see thumb experiment n Ganglion spinale creates a hyperbolic projection into medulla spinalis n So the movement is compensated, thumb position (up/down) does not influence homunculus position n -> Nerve system needs 'normalized' or scaled maps – free of body distortions n Penfield's "Homunculus" seems to be a scaled projection n Shift of somato-topic maps can be compensated –Sensory maps –Motor maps

63 22/09/05Israel Lectures © G. Heinz, www.gfai.de/~heinz62 Visual Cortex n Waves define the direction of self interference location n Supposed, nerve bundles have comparable delays n Self interference location appear, where wave direction and screen have identical orientation n Scale-normalization of images needs zooming and movement n Visual cortex as a normalized wave field screen? Heinz 1993

64 22/09/05Israel Lectures © G. Heinz, www.gfai.de/~heinz63 Interference Circuit Examples n To detect scenes or frequencies or codes, to control bodies, to create behaviour…

65 22/09/05Israel Lectures © G. Heinz, www.gfai.de/~heinz64 Bi-directional: Singers Synchronization? n Using micro-electrodes, Wolf Singer found 1986 a deep tone in cats cortex n Has he found an interferential wave projection? n To "hold" a projection for some time (learn phase), we need a repetition? observation


Download ppt "Heinz, G.: Waves on Wires – Introduction to Interference Networks n What "Integrate and Fire" suggests n Interference Principle, I.- Networks n 1D-, 2D-,"

Similar presentations


Ads by Google