The electrophysiological assessment of visual pathway integrity relies fundamentally on the precise, noninvasive capture of transretinal electrical currents evoked by luminous stimulation. Within the full-field electroretinogram, the b-wave stands as the single most critical indicator of inner retinal health, translating synaptic neurotransmission into an observable biometric waveform. By capturing the post-photoreceptoral depolarization of bipolar cells and secondary glial currents, this diagnostic signal provides neuroscientists and ophthalmologists with an indispensable window into the functional architecture of the vertebrate visual system.
B-Wave of the Electroretinogram
1. Concise Definition
The b-wave of the electroretinogram (ERG) is the major, positive-going electrical potential recorded across the ocular surface following brief or sustained photic stimulation of the retina. It emerges immediately after the initial negative-going electroretinogram a-wave, representing the electrical field potentials generated largely by the light-induced depolarization of retinal ON-bipolar cells, modulated in part by transretinal potassium flux driven by surrounding Müller glial cells.
In clinical electrophysiology, the b-wave is quantified primarily by its peak amplitude, measured in microvolts from the trough of the antecedent a-wave to the highest peak of the positive deflection, and by its implicit time, measured in milliseconds from stimulus onset to peak crest. Because it reflects post-synaptic transmission within the inner nuclear layer rather than phototransduction in the outer segments alone, the b-wave serves as a sensitive functional biomarker for inner retinal ischemia, neurotransmission defects, congenital channelopathies, and hereditary vitreoretinopathies.
2. Etymology & Linguistic Origin
The term derives from a systematic naming convention established during the early physiological categorization of sensory potentials. The letter “b” represents the second sequential wave identified in the mammalian ocular light response, directly following the initial corneal-negative “a” deflection and preceding slower positive deflections termed the “c” and “d” waves. This alphabetical nomenclature was popularized in the classical physiological literature by pioneering Swedish-Finnish neurophysiologist Ragnar Granit during the 1930s, who separated the complex compound response into distinct subcomponents designated by Roman numerals and letters.
Linguistically, “electroretinogram” is a neoclassical compound formed from three roots: the Greek ēlektron (amber, the ancient source of static electricity by friction), the post-classical Latin anatomical term retina (likely derived from rete, meaning net, describing the delicate vascularized neural mesh lining the posterior globe), and the Greek suffix -gramma (something written, drawn, or recorded, from graphein, to write). Together, the term literally signifies the recorded electrical trace generated by the retinal net, with the “b-wave” designating its second, dominantly positive temporal phase.
3. Pronunciation & Grammatical Form
The term is pronounced phonetically as /ˈbiː weɪv əv ði ɪˌlɛk.troʊˌrɛt.ɪ.noʊ.ɡræm/. In grammatical structure, “b-wave” functions as a singular count noun phrase. It can appear either in absolute form (“the b-wave was markedly attenuated”) or as an attributive adjunct modifier preceding other nouns (“b-wave amplitude”, “b-wave implicit time”, or “b-wave kinetics”).
Standard orthographic conventions utilize a hyphenated format with a lowercase or uppercase letter “b” (“b-wave” or “B-wave”), though international standards typically prefer the lowercase roman “b-wave” to maintain consistency with the companion “a-wave”, “c-wave”, and “d-wave”. In clinical transcripts, it is frequently abbreviated in compound indices, most notably in the “b:a ratio”, which expresses the relative proportionality between inner and outer retinal electrical voltages.
4. Detailed Conceptual Explanation
To comprehend the biophysical nature of the b-wave, one must examine the micro-architecture of the neural retina and the spatial flow of extracellular currents during visual phototransduction. When light strikes the rhodopsin or cone opsin pigments embedded within the outer segments of rod and cone photoreceptors, it triggers a canonical biochemical signaling cascade involving transducin activation, phosphodiesterase stimulation, and intracellular cyclic guanosine monophosphate (cGMP) hydrolysis. This causes the closure of cyclic nucleotide-gated (CNG) cation channels, halting the persistent inward dark current and hyperpolarizing the photoreceptor membrane. This primary outer-segment hyperpolarization creates a cornea-negative extracellular field potential: the ERG a-wave.
In the dark, photoreceptors continuously release the inhibitory/excitatory neurotransmitter L-glutamate from their synaptic terminals in the outer plexiform layer. Light-induced hyperpolarization abruptly decreases glutamate release at these ribbon synapses. Retinal bipolar cells, which synapse directly with photoreceptors, are segregated into two distinct functional cohorts: OFF-bipolar cells, which hyperpolarize in response to light reduction using ionotropic kainate/AMPA receptors, and ON-bipolar cells, which depolarize when synaptic glutamate levels fall. The ON-bipolar cells express specialized metabotropic glutamate receptors, predominantly mGluR6, coupled via the G-protein subunit Gαo to the non-selective cation channel transient receptor potential melastatin 1 (TRPM1). In darkness, tonic glutamate binding to mGluR6 keeps the TRPM1 channel closed; upon photic cessation of glutamate release, TRPM1 channels open, allowing an influx of sodium and calcium ions that rapidly depolarizes the ON-bipolar cell dendritic arbor and cell body.
This massive, synchronous depolarization across millions of rod and cone ON-bipolar cells generates a radially oriented electrical field current that traverses the full thickness of the retina. The current sinks (regions of inward positive current flow) are located in the inner plexiform and outer plexiform layers, while the current sources (regions where current returns outward through the extracellular space) are situated toward the inner limiting membrane and the vitreous humor. Because the clinical ERG electrode sits at the cornea, it samples the remote positive summation of this dipole against a reference point, registering a prominent, rapid upward voltage excursion that overcomes and reverses the negative a-wave.
Historically, significant debate surrounded the secondary contribution of retinal Müller glial cells to this potential. When bipolar cells depolarize, they release potassium ions (K+) into the restricted extracellular space. To prevent neurotoxic accumulation and maintain homeostatic equilibrium, radially oriented Müller cells rapidly clear potassium through inwardly rectifying potassium channels, notably Kir4.1. This transcellular spatial potassium buffering drives a current loop through the glial cytoplasm from regions of high extracellular potassium in the plexiform layers toward the low-potassium vitreous endfeet. While early models attributed the entire b-wave voltage to this glial current, rigorous pharmacologic dissection using glutamate analogues and glial toxins has conclusively proven that ON-bipolar cell currents are the primary neurogenic generator, while Müller cell spatial buffering acts as a low-pass biophysical filter that shapes the rise time, crest morphology, and decay kinetics of the registered b-wave.
5. Historical Development
The electrical phenomena underpinning the b-wave were first glimpsed in the late nineteenth century during early explorations of biological electricity. In 1865, Swedish physiologist Alarik Frithiof Holmgren discovered that a flash of light directed at an isolated amphibian eye induced an electrical potential change between the cornea and the posterior pole. Independent confirmation came swiftly from James Dewar and John Gray McKendrick in Scotland in 1873, who demonstrated that visual excitation generates an active, measurable biological current rather than a passive photoelectric artifact.
The decomposition of this crude potential into distinct mathematical and temporal components was initiated by Francis Gotch in 1903 and formalized by Willem Einthoven and William Jolly in 1908. Einthoven and Jolly systematically classified the biphasic light response into an initial negative “A” wave, a prominent positive “B” wave, and a slow, prolonged positive “C” wave. However, the mechanistic origin of these waveforms remained obscure until Ragnar Granit conducted his landmark microelectrode experiments in the 1930s. Granit applied ether anesthesia and physiological manipulations to dissect the compound ERG into three distinct physiological processes: Process I (PI, corresponding to the slow epithelial c-wave), Process II (PII, corresponding to the positive inner retinal b-wave), and Process III (PIII, corresponding to the fast photoreceptoral negative a-wave).
During the 1960s and 1970s, John E. Dowling and Robert F. Miller revolutionized inner retinal electrophysiology through intracellular microelectrode recordings in mudpuppy (Necturus maculosus) retinas. Miller and Dowling demonstrated a striking temporal correspondence between light-evoked Müller cell depolarization and the rise of the b-wave, fostering the long-dominant hypothesis that the b-wave was solely an indirect glial reflection of neuronal activity. This view reigned until the late 1980s and 1990s, when pharmacological agents such as 2-amino-4-phosphonobutyric acid (APB or L-AP4), which selectively blocks the mGluR6 receptor of ON-bipolar cells, and barium ions (which block Kir4.1 glial channels) became widely utilized in mammalian models. Experiments by Stockton, Slaughter, Sieving, and others demonstrated that eliminating ON-bipolar transmission completely eradicated the b-wave, establishing ON-bipolar cell depolarization as the indispensable primary neural generator.
6. Theoretical Foundations
The modern conceptualization of the b-wave is rooted in the biophysical theory of volume conductor fields, formulated mathematically through cable theory and Maxwell’s equations applied to biological tissues. Because the retina is an anatomically stratified, highly laminated neural structure with strictly parallel cell orientations, radial currents running from the outer retina to the inner retina summate constructively, while lateral or tangential currents cancel each other out through destructive interference. The b-wave exists precisely because bipolar cells and Müller cells are arranged in perpendicular alignment to the retinal plane, creating a coherent dipole field oriented directly toward the corneal recording vertex.
Complementing volume conductor theory is the dual-retina concept first postulated by Max Schultze in the nineteenth century and quantified modernly via the duplicity theory of vision. The human visual system segregates signaling into high-sensitivity, monochromatic rod pathways optimized for scotopic conditions, and lower-sensitivity, fast-recovering, trichromatic cone pathways specialized for photopic conditions. The b-wave reflects this fundamental duality: under dark-adapted conditions, the b-wave is generated predominantly by rod ON-bipolar cells synapsing with hundreds of rods; under light-adapted conditions, rod pathways saturate, and the b-wave reflects the rapid, low-latency depolarization of cone ON-bipolar cells driven by cone pedicles.
Finally, receptor-effector coupling theory explains the unique non-inverting and inverting sign conservation of retinal synapses. In classical neurobiology, neurotransmitter release causes excitation. In the photoreceptor-to-ON-bipolar synapse, the system operates in reverse: glutamate functions as a hyperpolarizing antagonist at the postsynaptic mGluR6 receptor complex. The theoretical architecture of this synapse demands that whenever light extinguishes the photoreceptor “dark current”, the post-synaptic channel gate disinhibits, prompting the massive sodium and calcium influx that manifests physically as the b-wave.
7. Key Components, Types & Dimensions
The b-wave cannot be treated as a monolithic parameter; it manifests in multiple forms depending on adaptation state, stimulus intensity, and chromatic composition. The International Society for Clinical Electrophysiology of Vision (ISCEV) has standardized five primary full-field ERG protocols, each illuminating distinct dimensions of the b-wave:
- Dark-Adapted 0.01 ERG (Rod-Driven b-wave): Elicited by a dim flash (0.01 cd·s·m²) in a dark-adapted eye (minimum 20 minutes of scotopic adaptation). This response consists entirely of a slow, rounded b-wave with no detectable negative a-wave, reflecting pure signal transmission through rod photoreceptors to rod ON-bipolar cells.
- Dark-Adapted 3.0 ERG (Standard Combined b-wave): Evoked by a standard flash (3.0 cd·s·m²) in the scotopic state. This exhibits a large, sharp negative a-wave followed by a towering, high-amplitude b-wave that reflects the maximal, combined summation of both rod and cone systems driving inner retinal ON-pathways.
- Dark-Adapted 10.0 or 30.0 ERG (Enhanced Intensity b-wave): Generated by intense flashes that stimulate maximal phototransduction, facilitating clear visualization of oscillatory potentials nested on the ascending limb of the b-wave.
- Light-Adapted 3.0 ERG (Photopic Single-Flash b-wave): Recorded after a minimum of 10 minutes of light adaptation against a steady background luminance (30 cd/m²). This protocol completely saturates the rod system; the resulting b-wave has a much shorter implicit time (approximately 30 ms vs. 50–60 ms for rods), sharp morphology, and reflects pure cone ON- and OFF-bipolar cell activity.
- Light-Adapted 30 Hz Flicker: Stimulated with rapid repetitive flashes that exceed the temporal fusion frequency of the sluggish rod pathway. The resultant steady-state sinusoidal wave represents pure cone-driven inner retinal pathway activity, where the crest corresponds functionally to the transient b-wave.
- Oscillatory Potentials (OPs): High-frequency rhythmic micro-crests (typically between 100 and 160 Hz) superimposed upon the ascending phase of the scotopic and photopic b-wave, reflecting reciprocal feedback inhibitory circuits mediated by amacrine and interplexiform cells in the inner plexiform layer.
8. Examples & Illustrative Cases
To illustrate the clinical and diagnostic application of the b-wave, consider the following representative clinical paradigms:
Case 1: The Electronegative ERG in Central Retinal Vein Occlusion. A 68-year-old male presents with sudden, painless visual acuity loss in the left eye. Funduscopic examination reveals extensive flame hemorrhages, cotton-wool spots, and severe venous engorgement consistent with acute central retinal vein occlusion (CRVO). To evaluate whether the occlusion is ischemic or non-ischemic, a full-field ERG is performed. The Dark-Adapted 3.0 protocol demonstrates a normal, robust negative a-wave (reflecting preserved photoreceptors oxygenated by the intact choroidal circulation), but the positive b-wave is profoundly suppressed, plunging below the baseline. This produces an “electronegative” or “negative-type” waveform with a b:a amplitude ratio of 0.4 (normal > 1.0). The selective collapse of the b-wave confirms severe inner retinal hypoperfusion and ischemia in the distribution of the central retinal artery and capillary plexuses, prompting immediate surveillance for anterior segment neovascularization.
Case 2: Congenital Stationary Night Blindness (CSNB). A 7-year-old boy is referred for lifelong night blindness and mild nystagmus with normal daytime color vision and an entirely normal fundus appearance. Full-field ERG testing reveals a complete absence of the Dark-Adapted 0.01 response. In the Dark-Adapted 3.0 response, an a-wave of completely normal amplitude and implicit time is recorded, but the subsequent b-wave fails to ascend above baseline, yielding a classic Schubert-Bornschein electronegative ERG. Genetic testing identifies a mutation in the NYX gene (encoding nyctalopin) or TRPM1, confirming the complete form of X-linked congenital stationary night blindness (cCSNB). Photoreceptor phototransduction proceeds normally, but neurotransmission to the ON-bipolar cell is genetically blocked, extinguishing the b-wave while sparing outer-segment signaling.
9. Measurement & Assessment
Recording the b-wave with diagnostic reproducibility requires adherence to stringent physical and electrical protocols established by ISCEV. Patients undergo pupil dilation (mydriasis) using topical parasympatholytic agents (such as tropicamide) and sympathomimetic agents (such as phenylephrine) to ensure a standardized, maximal pupillary aperture (≥8 mm), eliminating variable optical light attenuation. Electrodes are positioned directly on or adjacent to the cornea. Preferred clinical devices include contact lens electrodes with built-in light conductors (e.g., Burian-Allen or Jet electrodes), conductive fiber electrodes placed in the lower conjunctival fornix (e.g., DTL fiber), or conductive foil/skin electrodes for pediatric subjects.
The photic stimulus must be delivered via an integrating full-field (Ganzfeld) dome. The Ganzfeld apparatus ensures that brief, uniform, white-light flashes illuminate the entire retinal surface evenly, preventing local luminance gradients from generating distorted regional response waveforms. Calibration of flash luminance (expressed in photopic candela-seconds per square meter, cd·s·m²) is performed regularly using calibrated photometers. Signals are captured through differential amplification systems featuring band-pass filtering typically configured between 0.3 Hz and 300 Hz. The lower cutoff prevents baseline drift caused by ocular movement or sweating potentials, while the high-frequency cutoff attenuates environmental electrical noise (such as 50/60 Hz mains interference) without blunting the peak of the rapid b-wave crest.
Analysis of the recorded trace focuses on two foundational parameters. Amplitude is defined strictly as the voltage distance from the trough of the negative a-wave to the maximum positive crest of the b-wave (or from pre-stimulus baseline if no a-wave is present). Implicit time (often called peak latency) is the temporal duration elapsed from flash onset to the peak of the b-wave. Furthermore, the b:a ratio is routinely computed by dividing b-wave amplitude by a-wave amplitude under bright scotopic flash conditions. A ratio falling below 1.0 indicates preferential inner retinal disruption.
10. Applications & Practical Significance
The b-wave represents an essential biometric readout across multiple clinical and scientific disciplines:
In ophthalmology and visual science, b-wave quantification is critical for the diagnosis and phenotyping of inherited retinal diseases. In conditions like retinitis pigmentosa, progressive photoreceptor loss leads to proportionate, symmetric attenuation of both the a-wave and the b-wave. Conversely, disorders characterized by selective inner retinal involvement—such as juvenile X-linked retinoschisis (caused by RS1 mutations leading to splitting of the inner retinal layers) and melanoma-associated retinopathy (MAR, where autoantibodies target TRPM1 or other ON-bipolar antigens)—display disproportionate loss of the b-wave relative to the a-wave.
In preclinical drug discovery and toxicology, pharmaceutical screening programs utilize rodent, canine, and non-human primate ERG testing to evaluate novel therapeutic compounds for ocular safety. Retinal toxicity frequently targets inner retinal metabolic machinery; subtle lengthenings in b-wave implicit time or drops in amplitude provide an early alert to drug-induced retinopathies before structural damage is visible on funduscopy or optical coherence tomography (OCT).
In neurology and metabolic medicine, the b-wave serves as a non-invasive index of central nervous system bioenergetics. Because the inner retina possesses one of the highest metabolic and oxygen consumption rates in the body, mitochondrial disorders, such as mitochondrial encephalomyopathy, lactic acidosis, and stroke-like episodes (MELAS) or Leber hereditary optic neuropathy (LHON), can induce alterations in b-wave dynamics. Similarly, in neurodegenerative conditions, such as juvenile neuronal ceroid lipofuscinosis (Batten disease), progressive b-wave extinction provides objective monitoring of neurodegenerative trajectory.
11. Research & Empirical Evidence
Extensive empirical investigations over the past four decades have systematically validated the precise cellular and molecular origins of the b-wave. Stockton and Slaughter (1989) published foundational pharmacological research demonstrating that bath application of L-2-amino-4-phosphonobutyric acid (L-AP4) selectively extinguished the b-wave in the amphibian retina without disturbing photoreceptor PIII potentials, directly implicating mGluR6 receptor signaling. Subsequent landmark investigations by Masu et al. (1995) created mGluR6-knockout mice, confirming that genetic targeted disruption of this single receptor completely abolished the on-response of the ERG while sparing photoreceptor function.
The role of ion channels downstream of mGluR6 was empirically resolved through pivotal studies by Morgans et al. (2009) and Shen et al. (2009). These independent research teams established that the transient receptor potential channel TRPM1 serves as the visual transduction channel gated by the mGluR6 signaling cascade in ON-bipolar cells. Mutations in mouse models of Trpm1, as well as identification of homologous human mutations, revealed a total loss of the b-wave, definitively cementing the molecular channelopathy framework for congenital stationary night blindness.
On the glial front, research led by Kofuji et al. (2000) using Kir4.1-deficient (inwardly rectifying potassium channel) mice provided definitive empirical data regarding the Müller cell component. Mice lacking Kir4.1 exhibited substantially reduced and slowed b-waves, proving that while Müller cells do not generate the initial voltage pulse, their potassium siphoning mechanism is essential for the rapid rise, proper amplitude, and full temporal dynamics of the physiological b-wave response.
12. Cultural & Cross-Cultural Considerations
While the basic biophysical properties of the b-wave are universal across human populations, clinical assessment requires careful calibration to account for demographic, ethnic, and contextual variables. Fundus pigmentation varies widely across diverse ethnic groups; individuals with deeply pigmented retinal pigment epithelium (RPE) and choroid absorb more incident light than lightly pigmented or hypopigmented individuals. Consequently, photic stimulation produces slightly differing effective retinal illuminance, influencing absolute b-wave amplitudes. Clinical electrophysiology laboratories must establish ethnically stratified and age-matched normative reference databases to prevent diagnostic misclassification.
From an international health and socioeconomic perspective, the accessibility of full-field ERG testing remains unequal. Sophisticated ISCEV-compliant Ganzfeld stimulators and low-noise electrophysiological testing rigs are resource-intensive, requiring specialized technical expertise, dedicated dark-adaptation suites, and costly calibration instruments. In low- and middle-income nations, the scarcity of specialized visual electrophysiology clinics creates significant hurdles for the early diagnosis of hereditary retinal degenerations. This has spurred global health engineering initiatives aimed at developing low-cost, portable, handheld ERG systems that evaluate b-wave metrics using skin electrodes in underserved rural and tropical environments.
13. Criticisms, Debates & Limitations
Despite its indispensability, relying on the b-wave as a diagnostic index presents notable limitations and methodological challenges. First, the full-field b-wave is a mass response representing the algebraic summation of electrical activity across the entire visual field. Consequently, focal or localized retinal lesions—such as geographic atrophy confined strictly to the fovea, early macular degeneration, or small focal ischemic infarcts—may leave the full-field b-wave completely indistinguishable from normal limits. A patient with legal blindness from end-stage macular disciform scarring can still display an entirely normal full-field b-wave, since the healthy peripheral retina dominates the gross signal.
Second, the dual origin of the b-wave (combining direct ON-bipolar currents with glial spatial potassium buffering) historically fueled persistent diagnostic confusion. While bipolar cells are the true functional elements, metabolic disruptions that impair Müller cell Kir4.1 channel conductance or membrane resting potential can alter the b-wave shape in the absence of primary neuronal pathology. Disentangling pure synaptic failure from secondary glial dysfunction remains a diagnostic challenge in non-specialized settings.
Finally, technical artifacts frequently confound b-wave analysis. Small shifts in contact lens electrode impedance, minor changes in electrode position on the cornea, subtle eye movements, micro-blinks, or variable pupillary dilation can induce amplitude fluctuations exceeding 20% between sequential trials. Clinicians must exercise caution when evaluating progressive disease based on marginal changes in b-wave amplitude unless stringent standardized protocols and test-retest statistical controls are enforced.
14. Related Terms & Distinctions
Understanding the diagnostic utility of the b-wave requires distinguishing it from other waveforms encountered during ocular electrophysiological recording:
- a-wave vs. b-wave: The a-wave is the initial cornea-negative deflection reflecting outer retinal photoreceptor hyperpolarization (closure of CNG channels), whereas the b-wave is the subsequent cornea-positive deflection representing post-synaptic depolarizing activity within inner nuclear layer ON-bipolar cells.
- c-wave vs. b-wave: The c-wave is a very slow, prolonged positive deflection occurring several hundred milliseconds to seconds after the stimulus, generated by the interaction between the retinal pigment epithelium (RPE) apical membrane and extracellular potassium alterations, rather than neural bipolar cell activity.
- d-wave vs. b-wave: The d-wave is a positive deflection observed at the cessation (“off”) of a long-duration photic stimulus, reflecting the repolarization and functional activity of OFF-bipolar and horizontal cells, in contrast to the b-wave which signals the onset of illumination through the ON-pathway.
- Pattern ERG (PERG) vs. Full-Field ERG b-wave: While the full-field b-wave evaluates global inner nuclear layer activity, the pattern ERG uses alternating checkerboard stimuli to evaluate retinal ganglion cell function and macular health, producing N35, P50, and N95 deflections rather than the classic full-field b-wave.
15. Summary / Key Takeaways
The b-wave of the electroretinogram represents a cornerstone of modern sensory neurophysiology and clinical ophthalmic diagnostics. Arising fundamentally from the light-evoked depolarization of retinal ON-bipolar cells, and refined by transretinal potassium siphoning through Müller glia, this positive corneal deflection encapsulates the critical synaptic transition from initial photon capture to downstream neural processing. Through standardized scotopic and photopic protocols developed by ISCEV, quantification of b-wave amplitude, implicit time, and the b:a ratio provides clinicians with an unparalleled noninvasive tool to diagnose retinal dystrophies, detect inner retinal ischemia, and monitor neurodegenerative and toxic retinopathies. As molecular genetics, pharmacological discoveries, and electrophysiological techniques continue to converge, the b-wave remains a quintessential benchmark for assessing the functional architecture of the living visual system.
References
- Granit, R. (1933). The components of the retinal action potential in mammals and their relation to the discharge in the optic nerve. The Journal of Physiology, 77(3), 207–239. https://doi.org/10.1113/jphysiol.1933.sp002964
- Kofuji, P., Ceelen, P., Zahs, K. R., Surbeck, L. W., Lester, H. A., & Newman, E. A. (2000). Genetic inactivation of the inwardly rectifying potassium channel Kir4.1 severely affects the electroretinogram. The Journal of Neuroscience, 20(15), 5733–5740. https://doi.org/10.1523/JNEUROSCI.20-15-05733.2000
- McCulloch, D. L., Marmor, M. F., Brigell, M. G., Hamilton, R., Holder, G. E., Tzekov, R., & Bach, M. (2015). ISCEV Standard for full-field clinical electroretinography (2015 update). Documenta Ophthalmologica, 130(1), 1–12. https://doi.org/10.1007/s10633-014-9473-7
- Miller, R. F., & Dowling, J. E. (1970). Intracellular responses of the Müller (glial) cells of mudpuppy retina: Their relation to b-wave of the electroretinogram. Journal of Neurophysiology, 33(3), 323–341. https://doi.org/10.1152/jn.1970.33.3.323
- Morgans, C. W., Zhang, J., Jeffrey, B. G., Nelson, S. M., Duvoisin, R. M., & Brown, R. L. (2009). TRPM1 is required for the depolarizing light response in retinal ON-bipolar cells. Proceedings of the National Academy of Sciences, 106(45), 19174–19178. https://doi.org/10.1073/pnas.0908711106