Inhibition of pain or response to injury in invertebrates and vertebrates

Gibbons, Matilda; Sarlak, Sajedeh

doi:10.51291/2377-7478.1649

Cited by 11 publications

(16 citation statements)

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“…According to the 'argument-by-analogy', insects displaying behavioural and physiological responses that are similar to vertebrates are indicative of their pain perception [55]. Indeed, there are several studies showing examples of analogous behaviour [50,56]. Drosophila (both larvae and adult), for example, displays pain-like behaviour to noxious stimuli, such as heat or acid [57,58].…”

Section: Aspects Concerning the Animal Welfare Of Insectsmentioning

confidence: 99%

“…Drosophila (both larvae and adult), for example, displays pain-like behaviour to noxious stimuli, such as heat or acid [57,58]. Furthermore, several insect species (i.e., cockroaches, Drosophila, ants, bees) engage in more self-grooming after injury and termite-hunting ants have even been found to treat other injured ants with the injured ants acting 'more injured' in the company of their nest-mates [56]. Regarding the subjective experience of pain, Gjerris et al [35] argue that "absence of proof should not be misunderstood as proof of absence" [35] (p. 105).…”

Section: Aspects Concerning the Animal Welfare Of Insectsmentioning

confidence: 99%

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Edible Insects as Food–Insect Welfare and Ethical Aspects from a Consumer Perspective

Delvendahl¹,

Rumpold²,

Langen³

2022

Insects

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A growing number of studies underline consumers’ concerns about the importance of animal welfare as a general concept for consumers’ purchase decisions. In particular, consumers perceive animal husbandry to be one of the most important aspects of animal welfare. Since intensive livestock production is criticized across society, the acceptance of current intensive production systems of edible insects is an issue of investigation. Criteria of insect welfare might differ from vertebrate welfare. One might argue that it is difficult to define standards for insect welfare due to their large diversity in living environments and feed requirements. In addition, it is debated whether insects are conscious and suffer from pain. It has been demanded to rear insects preferably under natural living conditions and some researchers proposed to consider them as sentient beings. Basic welfare and ethical aspects of insects as food and feed include species-specific mass rearing conditions and euthanasia, i.e., killing procedures. Consumers’ opinions and concerns regarding this issue have hardly been considered so far. In this paper, the animal welfare of prevalent livestock is defined and outlined, and relevant criteria are transferred to insect welfare. Different ways consumers might arrive at an animal welfare understanding are discussed, along with an overview of the few consumer studies on insect welfare. Furthermore, we consider how insects are presented in the public discourse and infer how this might be relevant to consumers’ perceptions of insect welfare.

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Section: Aspects Concerning the Animal Welfare Of Insectsmentioning

confidence: 99%

Section: Aspects Concerning the Animal Welfare Of Insectsmentioning

confidence: 99%

Edible Insects as Food–Insect Welfare and Ethical Aspects from a Consumer Perspective

Delvendahl¹,

Rumpold²,

Langen³

2022

Insects

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“…Another example of inhibition of nocifensive behaviour in insects is how, in some cases, insects have been noted to act visibly ‘normal’ after injury, by continuing to feed or not altering their behaviour [28]. This evidence has been suggested to indicate the absence of pain in insects [29,30]; however, it is more likely that it demonstrates that insects can prioritize other behavioural needs and reduce the nocifensive behaviour in certain contexts [31].…”

Section: Modulation Of Nociceptive Responses By Neural Mechanisms Out...mentioning

confidence: 99%

Descending control of nociception in insects?

2022

Self Cite

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Modulation of nociception allows animals to optimize chances of survival by adapting their behaviour in different contexts. In mammals, this is executed by neurons from the brain and is referred to as the descending control of nociception. Whether insects have such control, or the neural circuits allowing it, has rarely been explored. Based on behavioural, neuroscientific and molecular evidence, we argue that insects probably have descending controls for nociception. Behavioural work shows that insects can modulate nocifensive behaviour. Such modulation is at least in part controlled by the central nervous system since the information mediating such prioritization is processed by the brain. Central nervous system control of nociception is further supported by neuroanatomical and neurobiological evidence showing that the insect brain can facilitate or suppress nocifensive behaviour, and by molecular studies revealing pathways involved in the inhibition of nocifensive behaviour both peripherally and centrally. Insects lack the endogenous opioid peptides and their receptors that contribute to mammalian descending nociception controls, so we discuss likely alternative molecular mechanisms for the insect descending nociception controls. We discuss what the existence of descending control of nociception in insects may reveal about pain perception in insects and finally consider the ethical implications of these novel findings.

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“…It has been reported that insects will continue normal feeding and mating behaviours even when severely injured (Eisemann et al., 1984 ), and there is evidence that injured bees will not preferentially self‐administer morphine when injured (Groening et al., 2017 ). This should be interpreted with caution, since there is no particular reason to expect morphine to be a good analgesic in insects (see Gibbons & Sarlak, 2020 for this and other criticisms). To further complicate the picture, earlier studies reported insects showing decreased behavioural response to noxious stimuli when given opioids, changes which were blocked by the opioid antagonist naloxone (Nunez et al., 1983 ; Zabala et al., 1984 ; Zabala & Gomez, 1991 ).…”

Section: Current Controversiesmentioning

confidence: 99%

Animal sentience

Browning

Birch

2022

Philosophy Compass

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Sentience' sometimes refers to the capacity for any type of subjective experience, and sometimes to the capacity to have subjective experiences with a positive or negative valence, such as pain or pleasure. We review recent controversies regarding sentience in fish and invertebrates and consider the deep methodological challenge posed by these cases. We then present two ways of responding to the challenge. In a policy-making context, precautionary thinking can help us treat animals appropriately despite continuing uncertainty about their sentience. In a scientific context, we can draw inspiration from the science of human consciousness to disentangle conscious and unconscious perception (especially vision) in animals. Developing better ways to disentangle conscious and unconscious affect is a key priority for future research.

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Inhibition of pain or response to injury in invertebrates and vertebrates

Cited by 11 publications

References 0 publications

Edible Insects as Food–Insect Welfare and Ethical Aspects from a Consumer Perspective

Edible Insects as Food–Insect Welfare and Ethical Aspects from a Consumer Perspective

Descending control of nociception in insects?

Animal sentience

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