Peripheral sensory coding through oscillatory synchrony in weakly electric fish
- Washington University in St. Louis, United States
Figures
Figure 1
The peripheral sensory receptors of some mormyrid species fire spikes, whereas the receptors of other species produce spontaneously oscillating potentials.
(A) An extracellular recording of spontaneous spikes from a receptor of Petrocephalus microphthalmus. (B) Box plots of spontaneous interspike intervals in the receptors of three species. (C) An …
Figure 2
Spontaneous oscillatory activity is not synchronized across receptors.
(A) Receptor locations on the right side of one P. tenuicauda are illustrated as black dots (receptor size not to scale). (B) An approximate map of all 36 receptors in the right augenrosette of one P…
Figure 3
Spiking receptors encode pulse duration, whereas oscillating receptors do not.
(A, B) Extracellular recordings from a spiking receptor in B. niger during stimulation with positive-polarity (black) and negative-polarity (red) monopolar square pulses of 0.10-ms duration (A) and …
Figure 4
Frequency sensitivity of spiking receptors is matched to conspecific EOD power spectra, whereas frequency sensitivity of oscillating receptors is not.
(A) Representative EODs from four species with spiking receptors (Brienomyrus brachyistius, P. microphthalmus, Brevimyrus niger, and Pollimyrus adspersus), and two species with oscillating receptors …
Figure 5
Spiking and oscillating receptors encode interpulse intervals into interspike and interoscillation intervals, respectively.
(A, B) Extracellular recording from a spiking receptor in B. niger in response to a pair of positive-polarity monopolar square pulses of 0.2-ms duration and 3.0-ms interpulse interval (IPI) (A) and …
Figure 6
Synchrony across receptors is greatest for the first poststimulus oscillation and then rapidly declines.
(A) Responses of three oscillating receptors in P. tenuicauda to a single square pulse delivered in sequential recordings. Responses to each of 10 stimulus presentations are shown in gray and …
Figure 7
Oscillating receptors produce enhanced oscillation amplitudes at submillisecond IPIs matching their intrinsic oscillation periods.
(A, B) Extracellular recording from an oscillating receptor in P. tenuicauda in response to a pair of monopolar square pulses of 0.2-ms duration and 0.50-ms IPI (A) and 5.0-ms IPI (B). We measured …
Figure 8
Oscillating receptors are most sensitive to submillisecond IPIs occurring in group communication signals.
(A) A histogram of the IPIs recorded over 20 min from a single fish with spiking receptors (P. microphthalmus). Inset, illustration of IPI calculation. We recorded the electric signaling activity …
Figure 9
Behavioral responses reveal tuning to submillisecond IPIs in a species with oscillating receptors.
(A) The EOD rate over time in response to a single conspecific EOD (top) and a train of 10 conspecific EODs at constant 0.5-ms IPI in one P. tenuicauda. Stimuli were delivered at time = 0 s. We …
