Philippa Kaur

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Incentivizing farmers to shift from conventional to regenerative practices could help fulfil the United Nations Food Systems commitments to transform food supply chains — as well as reducing carbon emissions (see L. A. Schulte et al. Nature Sustain. 5, 384–388; 2022).
Competing Interests
The authors declare no competing interests. More

Cliffs present a unique flora that has been little studied until now mainly because of the inherent difficulties to access this unique environment, as shown in Fig. 2. The techniques currently used to access plants on steep slopes and cliffs (e.g., abseiling, helicopter) are generally dangerous, costly and time consuming. Using a small aerial manipulator to sample plants on the cliffs can represent many advantages, including safety and portability, as well as the capability of reaching otherwise inaccessible locations easily, quickly and at low cost.Figure 2Examples of the cliff habitats of some critically endangered species on the Kauaʻi Island along with the count of known individuals as of February 2022.Full size imageHowever, several technical challenges make it difficult to develop suitable aerial manipulators for this task. Indeed, the sampling of plants on cliffs necessarily leads to significant collision risks, as well as contact forces and moments during sampling that can destabilize the drone. The samples collected would also need to be accessed from the side of the aerial platform22. Any weight (e.g., sampling tool, collected samples) located horizontally away from the center of mass of the drone creates large additional demands on the propulsion system of most drones. To collect specific plant parts in windy conditions (e.g., scion, flowers, seeds, etc.), precise and fast motion is required even in degraded Global Navigation Satellite System (GNSS) coverage near the cliffs. The great diversity of plant species and morphology found on cliffs, as well as the variety of targeted sections of plant, also represent a major design challenge. Finally, to maximize the adoption of this tool, it is also desirable that scientists with minimal training could use this platform. The next sections describe how these challenges were addressed through the development of the Mamba.Suspended sampling platformThere are a multitude of configurations that could have been explored to sample plants on cliffs. Some drones have manipulators rigidly attached to their structure20,23. However, these manipulators tend to have a limited reach to keep the center of mass within the propeller footprint and to minimize the inertia of the system. This could result in a high collision risk with the propellers in the uneven terrain found on cliffs. The contact forces created during the sampling operation also generate destabilizing moments through manipulators rigidly attached to the drone. To address these challenges, concepts involving a compliant manipulator operated from specialized drones were also explored10. Alternatively, some aerial manipulators were also passively suspended under the drone through a long rod21,24. This keeps the drone above potential obstacles within the environment, significantly reducing the operator’s mental demand and stress while also reducing the disturbances transmitted to the drone to a downward force aligned with the rod and yaw torque. To maintain these advantages while providing better precision, some projects have developed cable suspended platforms equipped with thrusters25,26. As these platforms do not have to counter gravity, the thrusters can be positioned to fight external disturbances more efficiently (e.g., wind, contact forces, drone movements). Existing systems however only stabilize the suspended platform close to its equilibrium point.The chosen concept for the Mamba, illustrated at Fig. 3, consists of a suspended platform that can stabilize itself far from its natural equilibrium to provide a large workspace. The lifting drone in this system stays safely away and above from steep cliff faces, while supporting the platform and providing rough positioning in space through better GNSS coverage. The platform is suspended 10 m below the lifting drone using four attachment points to prevent pitch and roll motions. The cable also acts as a low pass filter, isolating the platform from the fast drone movements required to fight wind disturbances. The suspended platform design can then focus on fast and precise positioning, while also being tolerant to contacts during sampling. To do so, four pairs of bidirectional actuators are used to control the motion in the plane of the pendulum (i.e., x and y translation, as well as yaw). Two pairs of actuators are installed in the x-direction to provide sufficient force to reach plants as far as 4 m from the equilibrium position. This corresponds to roughly 3.3 m from the tip of the lifting drone’s propellers.Figure 3(a) General concept of the Mamba and lifting drone during transit and sampling on cliffs. (b) Side view of the Mamba showing the components and cable installations. (c) Top view showing the antagonist thrusters configuration. (d) Close-up of the sampling tool and 2 degrees of freedom (DOF) wrist specifically designed to sample small fragile plants.Full size imageSince the Mamba is self-powered and has its own communication system, the lifting drone function is simply to lift the platform and hold it in place. This made it possible to select amongst the many commercially available products to accelerate the development of the Mamba. The DJI M300 was chosen as it comes equipped with a 360° optical obstacle avoidance vision system, an IP45 rating, and a flight time of 20 min with the Mamba attached (3.3 kg). It also advertised a four constellation GNSS receiver for better coverage around buildings, structures, and cliffs.Precise control in windsWinds under 20 km/h represent a gentle breeze on the Beaufort scale. At this level, the wind only moves the leaves, and not the branches, which allows for ideal sampling conditions. According to historical weather data from 2020, daily maximum winds are less than 20 km/h for 40 to 70% of the year, depending on the exact location on Kauaʻi Island (i.e., Lihuʻe International airport, as reported by the National Oceanic and Atmospheric Administration, and the Makaha Ridge Weather Station, as reported in the MesoWest database). This also implies that Kauaʻi experiences stronger winds on certain days which would make precise sampling difficult. Wind conditions are also more challenging near cliff faces, with increased turbulence and vertical airflow along the cliff.To allow operations on most days, while providing precise positioning and fast rejection of wind disturbances, the actuators of the Mamba are oriented in the horizontal plane. This allows the actuator forces to directly affect the motion of the suspended platform. Each actuator of the Mamba consists of a pair of brushless DC motors and 23 cm propellers capable of producing 7 N of force. The motors are installed in opposite directions, are always idling at their minimum rotation speed, and are commanded to only create force in their preferred direction. This antagonistic configuration avoids the low-velocity dead zone of a brushless motor during thrust reversal. This makes it possible to quickly revert the direction of the thrust and nearly triples the bandwidth of the actuators to approximately 2.5 Hz27. This configuration, however, comes at the expense of added mass and components.The Mamba is equipped with a flight controller that includes a control system, and a state estimator. To avoid degraded GNSS coverage issues, the state estimator only uses data from a high accuracy inertial measurement unit (IMU) to estimate the attitude of the platform. This provides the relative position of the platform with respect to the drone and is sufficient for teleoperation. Three separated proportional-derivative controllers are used for each of the DOF controlled by the actuators. This control system also provides attitude-hold assistance (i.e., pitch and roll, which correspond to x and y displacements, as well as yaw). This implies that if the user does not send any commands, the suspended platform maintains its current state.Figure 4 illustrates the stabilization accuracy of the Mamba when moving along a representative trajectory when suspended indoors from a 5.7 m cable (limited by ceiling height). This experiment confirmed that the sampling tool can maintain a position at a horizontal reach of 2.25 m with a precision of about 5 cm for 30 s. As the horizontal reach and precision are limited by the cable angular displacements (e.g., component of weight acting on the pendulum, IMU angular resolution), the resulting workspace when operating with a 10 m long cable would reach a radius of 4 m with a positioning accuracy of about 9 cm. To account for potential external disturbances like wind, the sampling tool was designed with an opening of 15 cm. This creates some margin for the pilot to align the target with the sampling mechanism. Field trials detailed below demonstrated that the Mamba actuators and controller could maintain a sufficiently stable position to sample plants in winds During the sampling phase, wind speed averaged 15.7 km/h with a standard deviation of 6.8 km/h, while wind gusts reached an average of 20.1 km/h with a standard deviation of 6.5 km/h. The maximum average wind speed recorded during sampling was 28 km/h with gusts up to 37 km/h. This represents a lower bound of the system performance, as no failure resulted from the wind conditions experienced during the trials. The a ttached Supplementary Video also demonstrates the stability of the system.Figure 4Representative motion of the sampling tool within its workspace based only on feedback from a high accuracy IMU and recorded using a motion capture system. The natural equilibrium point is at (0,0). The experiment starts with a 90° rotation around the z axis, followed by a forward movement along the x-axis of the Mamba and a lateral movement along its y-axis. The system then maintains this position for 30 s without any user inputs. Produced in MATLAB R2021a.Full size imageTeleoperated sampling of cliffs habitatsPlants growing on Kauaʻi cliffs exhibit a wide morphological variety. For this project, targets ranged from small herbaceous plants such as Euphorbia eleanoriae (plants  More

Acidification of CPHistorical geochemical data suggest that the water chemistry of Cinder Pool (CP) has been relatively stable from the time of first reported geochemical data in 1947 until autumn 2018, followed by pronounced acidification between winter and spring 2019 (Supplementary Data 1, Fig. 1a, b). Images and documentation dating to even earlier (1927) reveal the presence of cinders covering ~50% of the spring surface at that time, a temperature near boiling (91.5 °C), and a description of having high sulfate and chloride levels (although data was not provided), suggesting that its chemistry has been generally stable since its discovery1. Spring pH ranged between ~3.6 and 4.5 in 22 yearly measurements spanning 71 years (1947–2018; multiple measurements in the same year were averaged to represent each year) (Fig. 1b), while the pH has been subsequently measured after 2018 as low as 2.5 (Fig. 1b). A single pH measurement of 2.5 was also recorded in a 2003 publication27, although other measurements in 2003, 2000, and 2001 were more consistent with the long-term average (i.e., pH 4.2–4.3; Supplementary Data 1). Scrutiny of chemical data accompanying the pH 2.5 measurement in 2003 indicates a SO42− concentration (~48 mg L−1) that is considerably lower than would be expected for CP, even when the pH is much higher (SO42− = 80 mg L−1; pH = 4.2–4.3). Considering that sulfuric acid is the predominant buffer of pH in these systems7,28, the pH 2.5 reading in 2003 is considered questionable. Nevertheless, the 2018 shift in pH towards more acidic conditions was accompanied by a notable change in the appearance of CP. Prior to autumn 2018, the spring waters were cloudy gray with the considerable suspension of kaolinite clay particles20 and black cinders10. However, between autumn 2018 and spring 2019, the spring waters visibly turned blue-green and contained colloidal S° particles that were also deposited along the pool shelves, while the pool also lacked its characteristic black cinders (Fig. 1a). The spring has maintained this appearance since spring 2019 until at least July 2022.Fig. 1: Historical geochemistry of Cinder Pool (CP).a Top panel shows the visual change in the appearance of CP in 2016 (left) and 2020 (right). Scale bars in the bottom right are ∼1 m. b Measurements of pH (n = 21; black line) and sulfate (SO42−) concentrations (n = 12; red line) in CP waters between 1947 and 2021. Years with multiple measurements were averaged to represent the entire year. c Paired measurements of SO42− and chloride (Cl−) concentrations (n = 12) between 1947 and 2021 in the context of the same measurements for 488 YNP springs derived from previous studies. Paired points for CP are colored based on the year they were recorded (averaged for multiple measurements/year as described above). End member fluid compositions as described in the manuscript text are indicated based on the abbreviations: MO meteoric only, HO hydrothermal only, MG meteoric plus gas, HB hydrothermal plus boiling, HBG hydrothermal plus boiling plus gas. Points for 2016, 2018, 2019, 2020, and 2021 are indicated by “16”, “18”, “19”, “20”, and “21”, respectively.Full size imageThe source of fluids in YNP hot springs can be broadly defined by concentrations of sulfate (SO42−) and chloride (Cl−)2,7. These indicators have been previously used to define the source of YNP springs as either (1) hydrothermal only (HO) waters that have moderate concentrations of SO42− (~30 mg L−1 depending on the depth of boiling; described below) but high concentrations of Cl− (~300 mg L−1), (2) meteoric-only (MO) waters containing lower concentrations of both solutes, or (3) MO waters infused with gas (MG) that have lower Cl− concentrations and higher SO42− concentrations (Fig. 1c). Subsequent boiling and/or evaporation of HO waters can concentrate Cl− and SO42− to higher concentrations (termed hydrothermal plus boiling; HB), while additional gas input into HO or HB waters can lead to particularly high concentrations of both Cl− and SO42− (hydrothermal + boiling + gas; HBG)7 (Fig. 1c). Geochemical data from surveys spanning 1947 to 2018 suggest that CP was largely sourced by hydrothermal (HO) waters that have undergone boiling and/or evaporation (HB) during this time frame (Fig. 1c).HO and HB waters are typically circumneutral7, while CP (which is also sourced by HB waters) has maintained a moderately acidic pH of ~4 until autumn 2018 (Fig. 1b). Several other low pH HB waters have been previously observed within the NGB7. The moderately acidic pH in CP (prior to 2018) has been attributed to the hydrolysis of molten S° that occurs at depths of >18 m that leads to the formation of S2O32– 11. Oxygen (O2)-dependent oxidation of S2O32−, catalyzed by trace iron sulfide in the cinders, forms SxO62− that can then react with sulfide to yield S2O32− and S° 11. Alternatively, SxO62− can be disproportionated to form S2O32− and SO42− 11. The relative rates of these reactions in CP prior to 2018 are not known although similar concentrations of S2O32− measured between 1995 and 1997 suggest that rates of S° hydrolysis and rates of S2O32− formation have been relatively constant over yearly time scales11. The consumption of O2 by reaction with S2O32− and the consumption of sulfide involving reactions with SxO62− would limit the amount of sulfuric acid that could be formed, thereby maintaining a less acidic pH than other sulfuric acid buffered acidic springs in YNP7.Between November 2018 and March 2019, the pH of CP markedly decreased to 2.8 in 2019, 2.7 in 2020, and 2.6 in 2021. This coincided with a marked increase in SO42− concentrations of ~3–5 fold above historical ranges (Fig. 1b), while Cl− concentrations fluctuated without clear trends during this time (Supplementary Fig. 1c). Thus, CP transitioned from an HB water type to an HBG water type between autumn 2018 and spring 2019 and has remained this way since (Fig. 1c). This is interpreted to reflect a substantial increase in H2S/S° oxidation that results in the formation of SO42− and H+ (sulfuric acid). Several observations suggest a fundamental restructuring of CP’s unique sulfur cycling due to dramatic physical and chemical changes at this time. As described in more detail below, the molten S° layer was detected at a depth of 18 m in 2016. However, in 2020 and 2021 there was no evidence of molten S° at ~18 to 20 m depth as previously documented, and sampling equipment could be freely dropped to a depth of 22 m (length of the cable) without interruption. In the absence of the molten S° at depth, the S° hydrolysis product S2O32−, and the cinders that catalyze SxO62− formation from S2O32− and H2S, it is possible that such reactions that previously competed for H2S or O2 (i.e., those involving S2O32− and SxO62−) are no longer taking place in CP. This in turn would allow for sulfur compounds (H2S and S°) to now be oxidized, thereby contributing to spring acidification.Alternative scenarios underlying the dramatic changes in CP waters also warrant consideration, and the three most logical are presented below. First, it is possible that the waters sourcing CP may have shifted either via replacement of the primary source or by altered mixing of multiple water sources. Water isotope values (δ2H and δ18O) can be used to further deconvolute the sources of hydrothermal waters because distinctive isotope values are associated with distinct water sources and the various influences upon them including meteoric water recharge, boiling (and/or evaporation), and water–rock interactions7,29. The water isotope values measured among the measured depths in CP in 2020 were near the range of water isotope values observed in CP across multiple months in 201613 (depth-resolved water isotope measurements were not made in 2016). The 2020 CP water isotope values were slightly right-shifted relative to those of 2016, suggesting a minor increase in the evaporation and concentration of CP water isotopes between 2016 and 20207 (Supplementary Fig. 2). These data thus do not support the hypothesis that the source of waters in CP dramatically shifted between 2016 and 2020, consistent with the SO42− and Cl− measurements indicating that the primary change to CP waters was increased input or availability of H2S for oxidation.A second alternative explanation is that a change in the water level of CP could potentially alter residence times which could allow for more oxidation of sulfur compounds in the spring and increased acidification. Such a scenario would also likely result in increased evaporation and concentration of solutes. However, the minimal increase in water isotope values (Supplementary Fig. 2) and similar Cl− concentrations (Supplementary Fig. 1c) accompanying a ~3–5 fold increase in SO42− concentration pre- and post-acidification (Fig. 1b) argue that increased residence time was of minimal importance in acidification.A third possible explanation is that a change in the plumbing system of CP is now delivering more vapor phase gas that contributes H2S and acidity when oxidized. Such a scenario could be consistent with increased surface deformation, subsurface gas accumulation, and seismic activity that has been taking place near NGB just prior to these changes21, and the transition from HB-type to HBG-type waters in CP. Sulfur species isotope analyses would help deconvolute the sources of SO42− in CP, but samples for sulfur isotopic analyses were not collected prior to acidification. Thus, it is unclear if this process may also be contributing to the acidification of CP. Regardless, the disappearance of the molten S° cap either by consumption or displacement would in effect make H2S more available for oxidation, similar to increased vapor phase input. The acidification of hot springs involves the oxidation of H2S by O230. More specifically, partial oxidation of H2S at acidic pH (90% amino acid identity to other homologs from UYS MAGs), but that was only present on unbinned contig sequences. Proteins are grouped based on their functionalities and associations in complexes. TetH (tetrathionate hydrolase), SQO sulfide:quinone oxidoreductase, SOR sulfur oxygenase reductase, SoxABCD Sulfolobus oxidase, SoxM Sulfolobus oxidase, CbsAB cytochrome b 558/566, SoxLN cytochrome ba complex, DoxBCE Desulfurolobus oxidase, DoxAD/TQOab Desulfurolobus oxidase/thiosulfate-quinone oxidoreductase, HdrAB1C1B2C2 (heterodisulfide reductase), DsrE3 DsrE3 sulfurtransferase, Dld dihydrolipoamide dehydrogenase, LplA lipoate-protein ligase A, LbpA lipoate binding protein A/glycine cleavage system H protein, TusA tRNA 2-thiouridine synthesizing protein A, SreABC sulfur reductase, SAOR sulfite:acceptor oxidoreductase, HcaLS [NiFe]-hydrogenase group 1 g. SoxEFGHI and FoxABCDEFGH (ferrous iron oxidation) gene sets were also investigated, but not identified in any of the MAGs and not shown here for brevity. A complete description of the enzymes/proteins found in individual UYS MAGs is provided in Supplementary Data 4.Full size imageTo assess the potential role of the UYS in sulfur biogeochemical cycling, the metabolic functional potentials of these populations were evaluated in greater detail based on their reconstructed genomes (Fig. 5, Supplementary Data 3). The UYS encoded the capacity for autotrophy via full complements of enzymes involved in the 3-hydroxypropionate/4-hydroxybutyrate cycle (3HP-4HB) (Supplementary Data 4), consistent with the general potential for autotrophy in most other Sulfolobales36. Consistently, the SoxM subunit that has been suggested as a marker for (facultatively) heterotrophic growth of Sulfolobales37 was absent in all UYS MAGs (Fig. 5, Supplementary Data 4). Given that all known Acidilobus and Vulcanisaeta spp. are characterized heterotrophs without known autotrophic capacity38,39, the UYS are likely the sole primary producers in the CP surface and subsurface waters, consistent with their considerable dominance in CP water communities over time.Also consistent with almost all other Sulfolobales36, the UYS universally encode the ability to reduce O2 via terminal cytochrome oxidases, although not via Sulfolobus oxidase (SoxABCD) complexes that are common among many Sulfolobales36 but rather via Desulfurolobus oxidase complexes (DoxBCE) (Fig. 5, Supplementary Data 4). An additional terminal oxidase complex (CbsAB-SoxLN) was encoded in the 2020 CP MAGs along with several other UYS MAGs from other YNP springs, although homologs of CbsAB-SoxLN were not present in the 2016 CP MAGs or several others recovered from sediments of other hot springs (Fig. 5). Thus, a potentially important metabolic difference between the pre- and post-acidification (2016 and 2020, respectively) CP Sulfolobales was the ability to use different terminal cytochrome oxidase compliments for aerobic respiration. The capacity to use multiple terminal oxidases has been suggested as an adaptation to varying oxygen tensions/availabilities37,40 that likely substantively differed between the low ORP 2016 CP waters and the high ORP 2020 CP waters (Fig. 2c). Consequently, these data point to the ecological succession of UYS strains within CP that are, at least in part, related to strain-level differences in aerobic respiration capacities.A defining feature of most cultured Sulfolobales is the ability to grow chemolithoautotrophically by coupling the oxidation of sulfur compounds (e.g., S0) to aerobic respiration37. The slow kinetics associated with abiotic oxidation of S0 with O2 at temperatures More

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Test animals and husbandryWild type adult zebrafish (AB line) were initially obtained from China Zebrafish Resource Center (CZRC, China) and reared at the zebrafish facility of the University of Saint Joseph, Macao. Fish were maintained in 10 L tanks in a standalone housing system (model AAB-074-AA-A, Yakos 65, Taiwan) with filtered and aerated water (pH balanced 7–8; 400–550 μS conductivity) at 28 ± 1 °C and under a 12:12 light: dark cycle. Animals were fed twice daily with live artemia and dry powder food (Zeigler, PA, USA). The fish used in this study were 6–8 months old, both males and females (1:1), with a total length of 2.2–3.1 cm. The total number of specimens tested was 30 for the auditory sensitivity measurements and inner ear morphological analysis (6 fish per experimental group), and 78 for the Novel Tank Diving assay (15-18 fish per group).All experimental procedures complied with the ethical guidelines regarding animal research and welfare enforced at the Institute of Science and Environment, University of Saint Joseph, and approved by the Division of Animal Control and Inspection of the Civic and Municipal Affairs Bureau of Macao (IACM), license AL017/DICV/SIS/2016. This study was conducted in compliance with the ARRIVE guidelines60.Noise treatmentsPrior to acoustic treatments, all subjects were transferred to 4 L isolation glass tanks that were placed in a quiet lab environment (Sound Pressure Level, SPL: ranging between 103 and 108 dB re 1 μPa) for a minimum of 7 days. These tanks had no filtering system but were subject to frequent water changes, and the light, temperature and water quality were kept similar to the stock conditions. This adaptation period was important to reduce potential effects of noise conditions from the zebrafish housing system.After this period, groups of six zebrafish were transferred into separate acoustic treatment glass tanks (dimensions: 59 cm length × 29 cm width × 47 cm height; 70 L)—Fig. 1 Supplementary, where they remained 24 h in acclimation. Each tank was equipped with an underwater speaker (UW30, Electro-Voice, MN, USA) housed between two styrofoam boards (dimensions: 3 cm thick × 29 cm width × 47 cm height) with a hole in the centre, positioned vertically in one side of the tank. Another similar sized board was positioned in the opposite side of the tank and fine sand was placed in the bottom to minimize transmission of playback vibrations into the tank walls. Each treatment tank was mounted on top of styrofoam boards placed over two granite plates spaced by rubber pads to reduce non-controlled vibrations.Four acoustic treatment tanks were prepared for this study to be used alternately between trials and cleaning procedures, but only two were used simultaneously. When two tanks were being used, one contained specimens under acclimation and the other fish under a specific acoustic treatment. The tanks were housed in a custom-made rack and placed at least 1 m apart to minimize acoustic interferences. The tanks were used randomly for the different treatments across the various trials.The speakers were connected to audio amplifiers (ST-50, Ai Shang Ke, China) that were connected to laptops running Adobe Audition 3.0 for windows (Adobe Systems Inc., USA). After the acclimation period, specimens were exposed to white noise playbacks (bandwidth: 100–3000 Hz) at 150 dB re 1 µPa for 24 h, starting in the morning between 10 and 11 a.m. The bandwidth adopted covered the best hearing range of zebrafish27, as well as the frequency range of most anthropogenic noise sources, such as pile driving and vessels2.Sound recordings and SPL measurements were made with a hydrophone (Brüel & Kjær type 8104, Naerum, Denmark; frequency range: 0.1 Hz–120 kHz, sensitivity of − 205 dB re 1 V/μPa) connected to a hand-held sound level meter (Brüel & Kjær type 2270). Noise level was adjusted with the speaker amplifier so that the intended amplitude (LZS, RMS sound level obtained with slow time and linear frequency weightings: 6.3 Hz–20 kHz) was achieved at the centre of the tanks before each treatment. A variation in SPL of ±10 dB was registered in the closest and farthest points (in relation to the speaker). The sound spectra of the noise treatments were relatively flat similar to the setup described in a prior study by Breitzler et al.27.Moreover, the acoustic treatments were calibrated with a tri-axial accelerometer (M20-040, frequency range 1–3 kHz, GeoSpectrum Technologies, NS, Canada) with the acoustic centre placed in the middle of the tank. The sound playback generated was about 120 dB re 1 m/s2, with most energy in the horizontal axis perpendicular to the speaker, which was verified based on previously described methods using a MATLAB script paPAM16.In this study four sound treatments were used with varying temporal patterns similar to Sabet et al.18—Fig. 1: continuous noise (CN); intermittent regular noise with a fast pulse rate—1 s pulses interspersed with 1 s silence (IN1,1); intermittent regular noise with a slow pulse rate—1 s pulses interspersed with 4 s silence (IN1,4) and intermittent random noise—1 s pulses interspersed with 1, 2, 3, 4, 5, 6 or 7 s silent intervals in randomized sequence (RN1,7) leading to a mean interval of 4 s. All intermittent patterns had 5 ms ramps to fade in and fade out pulses for smooth transitions. 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