Static and Dynamic Adaptation of Insect Photoreceptor Responses to Naturalistic Stimuli

French, Andrew S.; Immonen, Esa‐Ville; Frolov, Roman V.

doi:10.3389/fphys.2016.00477

Cited by 6 publications

(5 citation statements)

References 52 publications

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“…This suggests the interactive driving control function (push-pull) of the visual sensitivity specificity of DRA vision and non-DRA vision induced by the linear polarization effect of a heterogeneous spectrum. These results are consistent with the specific regulatory output results of different polarized spectrum light characteristics on the inhibition, arousal, and excitation synergism of the polarized optic nerve response in locusts [26][27][28][29] . When illumination increased, linearly polarized UV and violet light intensity enhanced the sensitivity of DRA vision in the polarotactic response effect, whereas linearly polarized blue, green, and orange light intensity enhanced the sensitivity of DRA vision in the visual trend and polarotactic aggregation response, but inhibited the sensitivity of non-DRA vision in the polarotactic response effect.…”

Section: Discussionsupporting

confidence: 87%

Influences of DRA and non-DRA vision on the visual responses of locusts stimulated by linearly polarized and unpolarized lights

Zou,

Liu,

et al. 2023

International Journal of Agricultural and Biological Engineering

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Locust and grasshopper plagues pose a serious threat to crop production in many areas worldwide. However, there is a lack of effective, quick-acting methods to control such outbreaks. Methods exploiting the phototactic response of these insects are receiving increasing attention. The current study investigated the effect of linearly polarized and unpolarized light on locust phototactic and polarotactic responses, in particular the function of their dorsal rim area (DRA) and non-DRA visual fields. The results showed that the polarotactic function weight of DRA vision was stimulated by linearly polarized ultraviolet (UV) and violet light, the phototactic function weight was induced by blue, green, and orange light, and under linearly polarized light, the functional effect of DRA vision was strongest in response to linearly polarized violet light. Moreover, the locust visual response effect was related to spectral light attributes, with the linear polarization effect intensifying in response to the short-range vision sensitivity of non-DRA visual fields, whereas DRA vision regulated the short-range sensitivity of compound eye vision. When illumination increased, the synergistic enhancement effects of linearly polarized ultraviolet and violet light were significant, whereas the visual sensitivity was restricted significantly by linearly polarized blue, green, or orange light. Thus, non-DRA vision determined, while DRA vision enhanced, the phototactic response sensitivity, whereas, in linearly polarized UV or violet light, non-DRA vision determined, while DRA vision enhanced, the visual trend and polarotaxic aggregation sensitivity, with opposite effects in linearly polarized blue, green, or orange light. When illumination increased, there was a driving effect caused by linearly polarized violet light on non-DRA vision, whereas at short-wave lengths, the control effect induced by linearly polarized orange light was optimal; however, the photo-induced effect of linearly polarized violet light and the visual distance control effect of linearly polarized orange light were optimal. These results provide theoretical support for the photoinduced mechanism of the locust visual response effect and for the development of linearly polarized light sources for the environmentally friendly prevention and control of locust populations.

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Section: Discussionsupporting

confidence: 87%

Influences of DRA and non-DRA vision on the visual responses of locusts stimulated by linearly polarized and unpolarized lights

Zou,

Liu,

et al. 2023

International Journal of Agricultural and Biological Engineering

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“…7, A and B). Because light adaptation during responses to nonsaturating stimuli mainly affects initial voltage gain (French et al 2016) and not IR, and similarly modulates responses to both stimuli in the pair, we did not further control for light adaptation.…”

Section: Experimental Designmentioning

confidence: 99%

Effects of phase correlations in naturalistic stimuli on quantitative information coding by fly photoreceptors

Ignatova

French

Frolov

2018

Journal of Neurophysiology

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Natural visual scenes are rarely random. Instead, intensity and wavelength change slowly in time and space over many regions of the scene, so that neighboring temporal and spatial visual inputs are more correlated and contain less information than truly random signals. It has been suggested that sensory optimization to match these higher order correlations (HOC) occurs at the earliest visual stages, and that photoreceptors can process temporal natural signals more efficiently than random signals. We tested this early-stage hypothesis by comparing the information content of Calliphora vicina photoreceptor responses to naturalistic inputs before and after removing HOC by randomizing phase. Forty different, 60-s long, naturalistic sequences (NS) were used, together with randomized-phase versions of the same sequences to give pink noise (PN) so that each input pair had identical means, variances, mean contrasts, and power spectra. We measured the information content of inputs and membrane potential responses by three different methods: coherence, mutual information, and compression entropy. We also used entropy and phase statistics of each pair as measures of HOC. Responses to randomized signals generally had higher gain, signal-to-noise ratio, and information rates than responses to NS. Information rate increased with a strong, positive, linear correlation to phase randomization within sequence pairs. This was confirmed by varying the degree of phase randomization. Our data indicate that individual photoreceptors encode input information by Weber's law, with HOC within natural sequences reducing information transfer by decreasing the number of local contrast events that exceed the noise-imposed threshold. NEW & NOTEWORTHY Natural visual scenes feature statistical regularities, or higher order correlations (HOC), both in time and space, to encode surfaces, textures, and object boundaries. Visual systems rely on this information; however, it remains controversial whether individual photoreceptors can discriminate and enhance information encoded in HOC. Here we show that the more HOC the stimulus contains, the lower the information transfer rate of photoreceptors. We explain our findings by applying the Weber's paradigm of differential signal perception.

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“…A major feature of discharges of tibial campaniform sensilla to “naturalistic” torque stimuli was their sensitivity to fluctuations in forces ( 53 , 54 ). In many tests of flexor torques, firing of large 6B receptors occurred as a series of bursts, whereas discharges of smaller 6B receptors showed strong modulation of firing frequency.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of force feedback in walking using joint torques as “naturalistic” stimuli

Zill

Dallmann

Szczecinski

et al. 2021

Journal of Neurophysiology

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Control of adaptive walking requires the integration of sensory signals of muscle force and load. We have studied how mechanoreceptors (tibial campaniform sensilla) encode 'naturalistic' stimuli derived from joint torques of stick insects walking on a horizontal substrate. Previous studies showed that forces applied to the legs using the mean torque profiles of a proximal joint were highly effective in eliciting motor activities. However, substantial variations in torque direction and magnitude occurred at the more distal femoro-tibial joint, which can generate braking or propulsive forces and provide lateral stability. To determine how these forces are encoded, we utilized torque waveforms of individual steps that had maximum values in stance in the directions of flexion or extension. Analysis of kinematic data showed that the torques in different directions tended to occur in different ranges of joint angles. Variations within stance were not accompanied by comparable changes in joint angle but often reflected vertical ground reaction forces and leg support of body load. Application of torque waveforms elicited sensory discharges with variations in firing frequency similar to those seen in freely walking insects. All sensilla directionally encoded the dynamics of force increases and showed hysteresis to transient force decreases. Smaller receptors exhibited more tonic firing. Our findings suggest that dynamic sensitivity in force feedback can modulate ongoing muscle activities to stabilize distal joints when large forces are generated at proximal joints. Further, use of 'naturalistic' stimuli can reproduce characteristics seen in freely moving animals that are absent in conventional restrained preparations.

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Static and Dynamic Adaptation of Insect Photoreceptor Responses to Naturalistic Stimuli

Cited by 6 publications

References 52 publications

Influences of DRA and non-DRA vision on the visual responses of locusts stimulated by linearly polarized and unpolarized lights

Influences of DRA and non-DRA vision on the visual responses of locusts stimulated by linearly polarized and unpolarized lights

Effects of phase correlations in naturalistic stimuli on quantitative information coding by fly photoreceptors

Evaluation of force feedback in walking using joint torques as “naturalistic” stimuli

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