Abstract
Since the 1880s, when psychological factors related to electrodermal phenomena were first observed, electrodermal recording has become one of the most frequently used biosignals in psychophysiology. The major reason for its popularity is the ease of obtaining a distinct electrodermal response (EDR), the intensity of which seems apparently related to stimulus intensity and/or its psychological significance. Electrodermal recording is possible with rather inexpensive equipment, not only in the laboratory but also under less controlled field conditions.
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Notes
- 1.
- 2.
Abbreviations are determined by the first letter of the words: skin, potential, resistance, and conductance. Unfortunately, the commission overlooked that the abbreviation C is already reserved in physics for capacitance, and G is used for conductance, according to SI units (Sect. 1.4.1.1). The terminology used in AC methodology is somewhat more complicated. Edelberg (1972a) proposed A for admittance, and Z – the last letter in the alphabet – for the reciprocal unit, impedance. While the latter abbreviation was kept, admittance is abbreviated today by Y, the penultimate letter of the alphabet.
- 3.
Note that the dermis is also known as the corium (Latin for tauter skin) and that sometimes the term cutis is used only for the dermal part of skin (cutis vera, see Table 1.2).
- 4.
For example, Birgersson et al. (2011) performed a literature review on the skin thickness at the female volar forearm, revealing a stratum corneum thickness of 14 ± 3 μm compared to 1.2 ± .2 mm for the subcutis.
- 5.
Some authors (e.g., Orfanos, 1972) proposed a division into three layers, which may have been dependent upon different microscopic technology.
- 6.
This transitional layer, with an overall thickness of around 1 μm, is unusually thin in comparison with the underlying Malpighian layer and the overlying part of the epidermis. Orfanos (1972) has hence suggested that this layer should not be subdivided, but should be named on the whole as the stratum intermedium (i.e., intermediate) instead. However, sometimes only the granular layer is distinguished as the transitional zone (Jarrett, 1973a).
- 7.
The process of keratinization begins during mitosis via forming of the so-called tonofilaments, which are thin intraplasmatic fibers. In the upper layers, they are transformed into bundles of tonofibrillas having a greater density. With the keratohyaline generated in the lower stratum intermedium, these fibrillas merge to form complexes, which are converted in the upper stratum intermedium from one cell layer to another into epidermal keratin through changes in the cellular milieu. The tonofilaments are approximately parallel to the surfaces of the flattened cells, but are not in contact with the desmosomes, which are the intercellular contact zones of the keratinocytes. In the prickle cell layer, the number of desmosomes decreases and the intercellular spaces enlarge. This enables other cells, e.g., the melanocytes, to change their positions through movements.
- 8.
Sato et al. (1989) give slightly different numbers for the eccrine sweat glands: 1.6–4.0 million glands in total, with densities per cm2 of 64 on the back, 108 on the forearm, 181 on the forehead, and 600–700 on the palms and soles. For age, gender, and ethnic differences, see Sect. 2.4.3.
- 9.
- 10.
Sweat glands are found in the footpads of many species (Edelberg, 1972a, p. 378). Wang (1964) presumes that the cat’s sweat glands are apocrine instead of eccrine, but this view remains controversial (Edelberg, 1972a). Sato (1977) found it unlikely that the cat’s or the rat’s sweat glands had the capability to reabsorb ductal NaCl (Sect. 1.3.3.1), while those from the monkey’s paw closely resemble human eccrine sweat glands. Thus, generalization from primate results to human species is more tenable than from cats or rats (Roy, Sequeira, & Delerm, 1993). Types and distributions of sweat glands in different species are summed up in a description by Fowles (1986a, p. 54); more details are given by Weiner and Hellmann (1960).
- 11.
Only few human apocrine glands possess an ANS innervation (e.g., those in the axilla); they may be partly or even mainly under the control of circulating adrenaline (Weiner & Hellmann, 1960).
- 12.
It is still unclear whether specific vasodilative fibers exist in the human skin (which are known from cats), or if vasodilatation is secondary to sweating (Wallin, 1992).
- 13.
The search for origins of the skin’s vegetative activity is further complicated by the fact that transmitters such as noradrenaline, which acts vasoconstrictory on the peripheral blood vessels (Sect. 1.2.1.3), are also circulating freely in the blood.
- 14.
Sometimes also called sudorisecretory (sweat secretion eliciting) fibers.
- 15.
Sato and Sato (1981) used an in vitro preparation of single monkey palm eccrine sweat glands to demonstrate its reactivity to both cholinergic and andrenergic agents. They found that the maximum sweat rate was highest after cholinergic stimulation.
- 16.
Recording of action potentials from nerves with tungsten microelectrodes having tip diameters of a few μm, which are inserted through the intact skin into an underlying nerve, with a reference electrode placed subcutaneously in 1–2 cm distance (Wallin, 1992).
- 17.
Microneurography from the tibial nerve has been used by Nishiyama et al. (2001), together with videomicroscopy for recording sweat secretion of individual glands on the sole of four male individuals. Only 46% of the suprathreshold sudomotor nerve bursts elicited sweat secretion, but the number of sweat glands recruited was linearly related to the amplitude of sudomotor bursts. Hence, sweat secretion is primarily dependent on the intensity of sudomotor neural activity; however, the microenvironment of sweat glands may also play a role.
- 18.
Nishiyama et al. (2001), in their study described in the previous footnote, also recorded SPRs, finding that sudomotor bursts were followed by SPRs with latencies of 1.33 ± .33 s. The latency of sweat secretion was 2.29 ± .03 s, and the sweat expulsion latency was 3.22 ± .03 s.
- 19.
Recently, the existence of the limbic system has been much debated (e.g., LeDoux, 1996). However, since most of the literature on CNS elicitation of electrodermal phenomena used this expression (see Sect 1.3.4.1 “Subcortical Control of EDA”), it will be used in the present book as well.
- 20.
- 21.
- 22.
Sato (1977) generally questions the hypothesis of expulsion of already existing sweat by adrenergic stimulation. In his in vitro studies with isolated monkey sweat glands, he found so little preformed sweat in the lumen that an initial myoepithelial contraction could not expel an appreciable amount of sweat. Furthermore, Nicolaidis and Sivadjian (1972) used forehead sites for recording, so their observations may not be generalized to palmar sweat secretion.
- 23.
In deviation from the classical dermatological hypothesis, Tregear (1966) presumed that the sweat gland ducts, as well as the hair follicles, were of no importance for the amount of the body’s water loss. He referred to observations that the palmar skin, having three times the density of sweat glands compared to the rest of the body, is not very permeable to fluids, and that individuals without any sweat glands show as much insensible perspiration in a cool environment as normal individuals.
- 24.
The specific meaning of these different kinds of sweating for EDA is as yet unexplored, except those of the so-called emotional-sweating type. They are reported here for the sake of completion and with respect to possible future electrodermal research.
- 25.
One major difference between sweating in cats and humans may be that there is probably no thermal sweating in the cat (Jänig et al., 1983). Therefore, Roy, Sequeira, and Delerm (1993), hypothesized that the sweating of the cat’s footpad could be analogous to “emotional sweating” in humans (Sects. 1.3.2.4 and 1.3.3.3).
- 26.
Skin conductance was recorded bilaterally with 0.5 V constant voltage from the medial phalanges, using Ag/AgCl electrodes filled with 0.5% KCl in an agar medium (Sect. 2.2.2.5). A series of six 75 dB tones (1.311 Hz, 1 s, ISI randomized between 35 and 50 s) and four reorienting stimuli for probing OR reinstatement after habituation (Sect. 3.1.1) were applied. Left and right hand SC-OR was significantly related to left and right prefrontal areas (r = 0.44–0.60), area of the pons (r = 0.43–0.54) and left but not right temporal/amygdalar area (r = 0.47–0.53). No significant correlations were found with the area of the cerebellum, nonfrontal cortical areas, and the medial prefrontal cortex.
- 27.
- 28.
In general, the question of ipsi- or contralaterality of inhibitory vs. excitatory influences on electrodermal phenomena remains unresolved (Sect. 3.1.4.2).
- 29.
The bilateral medial prefrontal cortex is subsumed by the VMPFC, an area that is most consistently associated with missing SCR in patients with appropriate lesions. The possible role of brain areas for EDA biofeedback is discussed in Sect. 3.1.2.3.
- 30.
In the studies of this group, patients were diagnosed by MRI or X-ray computerized tomography, and SC was recorded with standard methodology (Sect. 2.2.7) from thenar/hypothenar sites.
- 31.
Recorded with standard methodology from 36 brain-damaged (15 females, 21 males) compared to 20 matched normal participants (7 females, 13 males).
- 32.
Measured with a biofeedback system via silver electrodes and KCl electrolyte cream from the palmar surface of the left hand. Their method of recording SC within an fMRI was described by Critchley et al. (2000), see Sect. 2.2.3.5.
- 33.
However, Langworthy and Richter (1930) could elicit EDRs and other autonomic responses by stimulating the pyramidal tract in cats. Roy, Sequeira-Martinho, and Brochard (1984) suggested this was due to the collaterals from the pyramidal tract reaching the RF, by which reticular elicitation of EDA has been mediated.
- 34.
Sequeira and Roy (1993) managed to elicit EDRs in cats by stimulating both motor and premotor cortical areas electrically, even in a “pyramidal preparation,” where all descending pathways except the pyramidal tracts were interrupted at bulbar level.
- 35.
White noise and videos of snakes with or without electric shocks delivered to the right hand. Laterality could not be evaluated since EDA was only measured on the left hand. SC was recorded with standard methodology (Sect. 2.2.7); the amplitude criterion was set to 0.05 μS.
- 36.
Wilcott (1963) showed that nonpalmar areas of skin that are normally regarded as thermoregulatory also took part in emotional sweating during a stressful situation (Sect. 3.2.2.2).
- 37.
More recently, Lademann, Jacobi, Surber, Weighman, and Fluhr (2008) showed that up to around 80 strippings may be required to fully remove the stratum corneum.
- 38.
From their lesion and stimulation research with cats, Sequeira and Roy (1993) concluded that a direct corticospinal sudomotor pathway may exist, contributing to the corticospinal control of final autonomic adjustments, in particular during grasping.
- 39.
In Anglo-American papers, there was a widespread custom for using the unit “mho,” i.e., the mirror image of “ohm,” instead. Meanwhile, S was introduced as the SI unit for conductance. Despite Venables and Christie (1980) argued for the continued usage of mho, in the last 20–30 years most researchers have used the unit S for conductance. The unit mho corresponds 1:1 to the unit μS.
- 40.
During the following considerations, the inner resistance of the voltage source should always be negligible for the reason of simplification.
- 41.
These connections can also be elucidated through a depiction with complex numbers. There R(f) is taken as the real part and X(f) as the imaginary part of a complex function. This depiction, which is preferred in electrophysics and in systems theory, is shown in the lower part of Fig. 1.10.
- 42.
Edelberg (1971) reported microelectrode recordings which provide evidence for the existence of an electrical barrier layer in the deeper layers of the epidermis. The SRL measured via a microelectrode, which had been slowly pushed into the epidermis, showed a slow continuous decrease at the beginning. If a certain point had been passed at which the participant first reported weak pain, SRL suddenly decreased until only the electrode resistance itself was present. The depth of the appropriate layer is 350 μm at the palm and 50 μm at the forearm.
- 43.
- 44.
- 45.
Taking into consideration that R 1 = constant and with application of the quotient rule for differentiation. The corresponding conductance equation is given in Boucsein, Baltissen, and Euler (1984).
- 46.
- 47.
However, since all the potential sources are “leaky” capacitors (see comments on Fig. 1.17 below), the parallel resistive component can conduct DC even when the capacitive component is fully charged.
- 48.
For the sake of simplification, Fowles omitted a fourth pathway in which the current flows into the duct from the corneum and then along the two sweat gland pathways.
- 49.
Observed in 10 healthy male participants who were subjected to handclaps and bursts of 85 dB white noise. Palmar sweating was recorded with a capacitance hygrometry technique, using a capsule mounted on the left hypothenar eminence close to the active SP electrode. The capsule was ventilated with dry nitrogen. For SP recording, Ag/AgCl electrodes filled with isotonic electrode cream made from Unibase were used, the neutral electrode being attached to a lightly abraded ventral site of the left forearm.
- 50.
Recently, Birgersson et al. (2011) refined the AC-recording technique as used by the Yamamoto group by means of electrical impedance spectroscopy. They also proposed a mathematical three-layer model of the skin, comprising (1) the stratum corneum, (2) the viable skin, which includes the other epidermal layers and the dermis, and (3) the fatty tissue of the hypodermis (Sect. 1.2.1.2). A noninvasive gold-plated probe, featuring two voltage injection electrodes, one current detector and a circular guard electrode (for diminishing the impact of surface leaking currents) was designed for carrying out two-point measurements with sinusoidal AC of varying frequencies. Recordings were taking from the volar forearm of a homogenous group of 60 young females. The skin site was soaked with a physiological saline solution (0.9% NaCl) for 1 min before the first recording was performed. Subsequent recordings were carried out at 5 min intervals up until 30 min in an ambient temperature of 21.7°C (±3°C) and a relative humidity of 36% (±7%). Impedance magnitudes (in kΩ) and the phase angle ϕ (in degrees) were measured at five different current penetration depths (by varying the voltage at the second current injection electrode from 5 to 50 mV) at 35 frequencies logarithmically distributed between 1.0 kHz and 2.5 MHz. In addition, the impact of NaCl concentration (0.9–18% NaCl) and soaking time was investigated in ten participants. Preliminary results revealed that – in the frequency range – the amount of current passing through the hypodermis (subcutis) can be regarded as negligible. As to be expected, the measured SZ varied considerably with the saline concentration and soaking time.
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Boucsein, W. (2012). Principles of Electrodermal Phenomena. In: Electrodermal Activity. Springer, Boston, MA. https://doi.org/10.1007/978-1-4614-1126-0_1
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