Adaptation towards scale-free dynamics improves cortical stimulus discrimination at the cost of reduced detection
Fig 5
Adaptation enhances discrimination at the cost of reduced detection: Temporal coding.
(A) The time course of population response during the 1 s (0.2 s resolution) following the four different foreground stimuli (red dots) showed little difference during the transient response. Black lines indicate response averaged over repeated trials. Gray lines indicate individual trials. Each response was subtracted by its time average and normalized by its variances to emphasize effects of rate coding. One example turtle shown. White dots indicate the 5 bins used to compute the 5 bit temporal response. (B) During the steady-state, different foreground stimuli evoked differing temporal structure of responses. Thus, temporal structure carries useful information for discrimination. (C) Summary of discrimination based on temporal structure for 14 experiments. Most turtles showed an increase in discrimination from transient to steady-state. (D) Variability in discrimination is better explained when changes in δ are accounted for. Similar to rate-based discrimination, power-law distributed (low δ) population dynamics are associated with optimal temporal discrimination. (E) Summary of detection based on temporal structure for 14 experiments. Detection typically decreased from transient to steady-state. (F) Variability in detection is better explained when changes in δ are accounted for. Similar to rate-based detection, power-law distributed (low δ) population dynamics are associated with low detection.