A Synchronization-Desynchronization Code for Natural Communication Signals

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Transcription:

A Synchronization-Desynchronization Code for Natural Communication Signals Jan Benda, André Longtin & Len Maler University of Ottawa, Ontario, Canada present address: ITB, Berlin, Germany ITB

Brown Ghost Knifefish (Apteronotus leptorhynchus) Electric Organ Discharge (EOD) mv/cm 2 1 1 2 5 6 11 Hz 1 15 Electrosensory system: Prey detection Communication 2

Communication I: Two Fish Fish 1: EOD frequency f 1 Fish 2: EOD frequency f 2 Beat with frequency f = f 2 f 1 f 3 Hz EOD amplitude modulation is encoded by electroreceptors (P-units).

Communication II: Large Chirps Signals emitted during male female interaction ( f > 6 Hz) Amplitude [mv/cm].1.1 2 Frequency [Hz] 16 12 8 15 1 5 18 ms 5 1 5 Hz 15

Communication II: Large Chirps EOD Female EOD Male + Chirp

Communication II: Large Chirps EOD Female EOD Male + Chirp = Amplitude [mv/cm] 6 4 2 3 EOD Amplitude Modulation Female Beat 13 Hz 2 1 Chirp 1 2 3

Fast Beats Synchronize Electroreceptors In vivo recordings of electroreceptor afferents (P-units) Spike raster EOD Amplitude 4.4 4 3.6 3.2 2.8 Beat f = 1 Hz 8 6 4 2

Large Chirps Desynchronize Response In vivo recordings of electroreceptor afferents (P-units) EOD Amplitude 4.4 4 3.6 3.2 2.8 Beat f = 1 Hz Chirp 24 ms 6 Hz Spike raster 8 6 4 2 2 4 6 8 Benda, Longtin, Maler (26) Neuron

Large Chirps Desynchronize Response In vivo recordings of electroreceptor afferents (P-units) Spike raster EOD Amplitude Firing rate [Hz] 4.4 4 3.6 3.2 2.8 6 5 4 3 2 1 8 Synchrony 6 4 Benda, Longtin, Maler (26) Neuron Beat f = 1 Hz 2 Desynchronization 2 4 6 8 5 ms 1 ms

Large Chirps Desynchronize Response In vivo recordings of electroreceptor afferents (P-units) Spike raster EOD Amplitude 4.4 4 3.6 3.2 2.8 Beat f = 18 Hz Firing rate [Hz] 6 5 4 3 2 1 8 Synchrony 6 4 Benda, Longtin, Maler (26) Neuron 2 Desynchronization 2 4 6 8 5 ms 1 ms

Large Chirps Desynchronize Response Correlation 1.8.6.4.2 Single unit recordings n = 38 ± 21 B 5 1 15 2 25 3 Beat f [Hz] baseline beat chirp Synchronization/desynchronization between f 5 and 2 Hz Benda, Longtin, Maler (26) Neuron

Large Chirps Desynchronize Response Correlation 1.8.6.4.2 Dual unit recordings n = 5 B 5 1 15 2 Beat f [Hz] 25 3 baseline beat chirp Benda, Longtin, Maler (26) Neuron

Population Response Response [µv] 3 2 1 6 Beat f = 1 Hz 4 2 2 4 6 Response [µv] 3 2 1 6 Beat f = 15 Hz 4 2 2 4 6 Response [µv] 3 2 1 6 Beat f = 2 Hz 4 2 2 4 6 Response [µv] 3 2 1 6 Beat f = 3 Hz 4 2 2 4 6 Benda, Longtin, Maler (26) Neuron

High Frequency Signals are Selectively Encoded by Synchronous Spikes Mutual information [Bits/Hz] 1.6 1.4 1.2 1.8.6.4.2 all spikes synchronous spikes 5 1 15 2 25 3 Stimulus frequency [Hz] Middleton, Longtin, Benda, Maler (27) submitted

Communication III: Small Chirps Short (14 ms) increase in EOD frequency (3 15 Hz).2 mv/cm.2 Frequency [Hz] 112 18 14 15 1 11 ms 5 5 1 76 Hz 15 2

Communication III: Small Chirps EOD Male 1 EOD Male 2 + Chirp

Communication III: Small Chirps EOD Male 1 EOD Male 2 + Chirp = Amplitude [mv/cm] EOD Amplitude Modulation Male 1 1.5 Beat 5 Hz Chirp 2 1 1 2

Spike raster EOD Amplitude Small Chirps Synchronize Response In vivo recordings of electroreceptor afferents (P-units) 2.8 2.4 2 1.6 Beat f = 1 Hz Firing rate [Hz] 4 3 2 1 Firing rate modulation 1 5 Benda, Longtin, Maler (25) J. Neurosci. Synchronization 5 1 5 ms 1 ms

Spike raster EOD Amplitude Small Chirps Synchronize Response In vivo recordings of electroreceptor afferents (P-units) 3.2 2.8 2.4 2 Beat f = 5 Hz Firing rate [Hz] 5 4 3 2 1 2 Firing rate modulation 15 1 5 Benda, Longtin, Maler (25) J. Neurosci. 5 Synchronization 1 15 2 5 ms 1 ms

Summary Male female interaction: Fast beats ( f > 6 Hz) Synchrony Large chirps desynchronize receptor population

Summary Male female interaction: Fast beats ( f > 6 Hz) Synchrony Large chirps desynchronize receptor population Male male interaction: Slow beats ( f < 3 Hz) Firing rate modulation Small chirps synchronize receptor population

Summary Male female interaction: Fast beats ( f > 6 Hz) Synchrony Large chirps desynchronize receptor population Male male interaction: Slow beats ( f < 3 Hz) Firing rate modulation Small chirps synchronize receptor population Any change of the degree of synchrony could code a signal!

Synchronization is Stimulus-Driven Correlation 1.8.6.4.2 Dual unit recordings n = 5 B 5 1 15 2 Beat f [Hz] 25 3 baseline beat chirp

Synchronization is Stimulus-Driven Correlation 1.8.6.4.2 Dual unit recordings n = 5 B 5 1 15 2 Beat f [Hz] 25 3 baseline beat chirp beat shuffled chirp shuffled

Population Response EOD Amplitude 2.8 2.4 2 1.6 6 4 Beat f = 1 Hz 2 2 4 6

EOD Amplitude 2.8 2.4 2 1.6 Population Response Beat f = 1 Hz Potential [µv] 2 2 6 4 2 2 4 6

EOD Amplitude 2.8 2.4 2 1.6 Population Response Beat f = 1 Hz Potential [µv] 2 2 6 4 2 2 4 6

EOD Amplitude 2.8 2.4 2 1.6 Population Response Beat f = 1 Hz Potential [µv] Response [µv] 2 2 3 2 1 6 4 2 2 4 6

EOD Amplitude 2.8 2.4 2 1.6 Population Response Beat f = 1 Hz Potential [µv] Response [µv] 2 2 3 2 1 6 4 2 2 4 6

Population Response Response amplitude [µv] 2 15 1 5 Population response n = 5 fish baseline beat chirp B 5 1 15 2 25 3 Beat f [Hz]