The ethological explanation of aggression

Ethology focuses on the study of animal behaviour in natural settings, often extending insights to human actions. It examines specific behaviours, such as aggression, across different species to identify patterns and underlying mechanisms.

Key features of Lorenz's theory of aggression

Lorenz developed a model of aggression drawing from observations of animal behaviour, which he extended to humans. He viewed aggression as an instinctive drive aimed at others within the same species, serving important survival purposes.

• Innate and adaptive nature - Aggression is seen as a built-in response that evolved to help individuals compete effectively for essential resources, increasing the chances of gene transmission to future generations.
• Triggering by environmental cues - External factors in the surroundings can activate aggressive tendencies, rather than aggression occurring randomly.

The process of aggression according to Lorenz

Aggression follows a build-up and release pattern, influenced by internal pressure and external triggers.

Key stages in the process:

• Aggressive energy accumulates steadily over time.
• The longer the period since the last aggressive act, the greater the internal build-up.
• A stimulus eventually activates the response.
• As pressure intensifies, a weaker stimulus can suffice to trigger aggression.
• In extreme cases, very high pressure might lead to spontaneous outbursts without any external prompt.
• The stimulus activates an innate releasing mechanism in the brain.
• This mechanism initiates a fixed action pattern.

Fixed action patterns

A fixed action pattern refers to a instinctive sequence of behaviours that is consistent across all members of a species. These patterns are rigid and uniform, ensuring predictable responses to specific triggers. For example, in some fish species during mating periods, vivid belly colours provoke rival males to engage in combat-like displays.

Research evidence: Tinbergen (1947)

• Method - Experiments involved presenting male fish with various models, including unrealistic ones with prominent colour patterns, and observing their responses compared to encounters with actual fish lacking those colours.
• Results - The models with distinctive colouration elicited stronger aggressive reactions than real fish without the colouration.
• Conclusions - Certain visual cues act as powerful triggers for instinctive aggressive behaviours, even when the stimulus is artificial.

Ritualised aggression in Lorenz's theory

Lorenz argued that aggression is often expressed in non-lethal ways to prevent species extinction.

Key principles:

• If conflicts frequently resulted in death, populations would decline rapidly.
• Many animals use submission displays to signal defeat and end fights safely.
• In humans, activities like sports may serve as safe outlets for channelling aggressive instincts without causing harm.

Strengths and weaknesses of the ethological explanation

The ethological approach offers valuable insights but also faces limitations when applied to complex human behaviour.

Strengths of the ethological explanation

• Evidence from animal behaviour - Fixed action patterns are observable in various species, providing a basis for understanding instinctive aggression.
• Explanation for human patterns - It may account for why humans engage in frequent but rarely fatal conflicts, as evolutionary pressures might not have favoured strong submission signals in our species.

Weaknesses of the ethological explanation

• Limited scope for premeditated acts - The theory struggles to explain calculated or planned aggression, which does not fit the model of instinctive build-up and release.
• Contradictory research on catharsis - Arms et al (1979) found that viewing aggressive sports heightened rather than diminished aggressive tendencies in participants, challenging the idea of harmless ritualised outlets.

Evolutionary explanations of aggression

Evolutionary psychology posits that aggression developed as a beneficial trait, enhancing survival and reproductive success in ancestral environments.

Adaptive functions of aggression

• Gaining status or dominance - Higher social standing could improve access to opportunities and mates.
• Acquiring resources - This includes securing territory or partners essential for survival.
• Defensive purposes - Aggression helps protect against threats to resources or personal safety.
• Preventing infidelity - In committed relationships, it deters partners from straying, ensuring investment in offspring.

Sex differences in aggression and jealousy

Evolutionary perspectives highlight variations in aggressive behaviour between males and females, linked to historical reproductive challenges.

Research evidence: Wilson and Daly (1985)

• Method - Analysis of murder cases, focusing on the demographics of perpetrators and victims, as well as the contexts of the incidents.
• Results - Most cases involved young males as both killers and victims, with 29 instances stemming from escalated displays of bravado; only one case involved a dispute between females.
• Conclusions - Males exhibit higher aggression levels due to intense historical competition for mating opportunities, which limited reproductive success more than resource access did for females.
• Evaluation - The findings align with evolutionary predictions, but they overlook social and cultural influences that might contribute to these patterns.

Reasons for sex differences in aggression

• Males historically encountered fiercer rivalry for partners, as female fertility was a key constraint on reproduction.
• Females were more constrained by resource availability, leading to evolved strategies focused on securing support rather than direct confrontation.

Research evidence: Buss et al (1992)

• Method - A questionnaire-based study across cultures, presenting participants with a hypothetical scenario in a romantic relationship and asking which aspect—emotional attachment or sexual involvement with another—would cause greater distress.
• Results - A higher proportion of males (51%) than females (22%) found sexual infidelity more distressing.
• Conclusions - Male jealousy centres on uncertainty about paternity, while females are more affected by emotional bonds that could divert resources from their offspring.
• Strengths - Replicable results across diverse cultures point to innate, evolved mechanisms.
• Limitations - Reliance on hypothetical scenarios and restricted response options may reduce the validity of the findings, as real-life reactions could differ.

Criticisms of evolutionary theories

While evolutionary explanations provide a framework for understanding aggression, they face several challenges.

Key limitations of evolutionary approaches

• Failure to address variations - These theories do not fully explain differences in aggression levels across cultures or individuals.
• Neglect of social influences - Environmental and societal factors, such as upbringing or norms, are often overlooked.
• Challenges in testing - It is difficult to conduct empirical tests on humans due to ethical and practical constraints, making the theories hard to falsify or confirm.