Stimulus background influences phase invariant coding by correlated neural activity
- MGill University, Canada
Figures
Figure 1
A chirp with given duration and frequency excursion gives rise to heterogeneous waveforms depending on time of occurrence within the beat cycle as well as beat frequency.
(A) Two weakly electric fish with their electric organ discharges (EODs) in red and blue. (B) The EOD waveforms of both fish (top red and blue traces) show alternating regions of constructive and …
-
Figure 1—source data 1
Source data for Figure 1.
- https://doi.org/10.7554/eLife.24482.003
Figure 2 with 2 supplements
Phase invariant coding of chirps by correlated but not single neuron activity is best at low and deteriorates for higher beat frequencies.
(A) Schematic showing the experimental setup. (B) Example stimulus waveforms (top) for chirps occurring at different beat frequencies (black: 2 Hz; dark gray: 16 Hz; light gray: 64 Hz), normalized …
-
Figure 2—source data 1
Source data for Figure 2.
- https://doi.org/10.7554/eLife.24482.005
Figure 2—figure supplement 1
Responses to small chirps occurring on top of beats with varying frequencies.
(A) Raster plots of two example afferent responses (blue) and their correlated activity (purple) to chirps occurring at different phases for background beat frequencies of 2 Hz (left), 16 Hz …
-
Figure 2—figure supplement 1—source data 1
Source data for Figure 2—figure supplement 1.
- https://doi.org/10.7554/eLife.24482.007
Figure 2—figure supplement 2
Phase locking in primary afferents to different background beat frequencies.
(A) Phase locking index as a function of background beat frequency. (B) Phase histograms of example afferents to background beat frequencies of 2 Hz (top), 16 Hz (middle) and 64 Hz (bottom). Note …
-
Figure 2—figure supplement 2—source data 1
Source data for Figure 2—figure supplement 2.
- https://doi.org/10.7554/eLife.24482.009
Figure 3 with 1 supplement
Detectability and invariance of perception are best predicted by correlated afferent activity for different beat frequencies.
(A) Experimental setup. Each fish (N = 33) was placed in an enclosure within a tank (chirp chamber). Stimuli were applied via two electrodes (S1 and S2) perpendicular to the fish’s rostro-caudal …
-
Figure 3—source data 1
Source data for Figure 3.
- https://doi.org/10.7554/eLife.24482.011
Figure 3—figure supplement 1
Characteristics of real chirps do not vary across baseline beat frequencies.
(A) Probability distributions of the frequency increase of small chirps recorded at different baseline beat frequencies. All samples originate from the same distribution (Kruskal-Wallis test, df = 7;…
-
Figure 3—figure supplement 1—source data 1
Source data for Figure 3—figure supplement 1.
- https://doi.org/10.7554/eLife.24482.013
