Lorenz's Research (AQA A-Level Psychology): Revision Notes
Lorenz's Research
Konrad Lorenz was a prominent ethologist (someone who studies animal behaviour) working in the early 20th century. His groundbreaking research on imprinting in birds provided crucial insights into how early bonds form between infant animals and their caregivers, which later informed our understanding of human attachment.
Background to the research
Lorenz first observed imprinting as a child when a neighbour gave him a newly hatched duckling that subsequently followed him everywhere. This early observation sparked his lifelong interest in studying how young birds form attachments to the first moving object they encounter after hatching.
Animal studies like Lorenz's are valuable to psychologists because attachment-like behaviours are common across many species. These studies can be conducted for both ethical and practical reasons - it would be unethical to separate human babies from their mothers, and animals breed faster, allowing researchers to observe results across multiple generations.
The imprinting experiment
Procedure
Experimental Design: The Goose Egg Study
Lorenz designed a classic controlled experiment using goose eggs. He randomly divided a clutch of eggs into two groups:
Control group: Half the eggs hatched naturally in the presence of their mother goose
Experimental group: The other half hatched in an incubator where Lorenz was the first moving object they encountered
Findings
The results were striking and consistent:
- The incubator group followed Lorenz everywhere
- The control group followed their biological mother
- When both groups were mixed together, each continued to follow their respective 'parent figure' - the control group stayed with the mother goose, whilst the experimental group continued following Lorenz
This demonstrated that imprinting occurs when mobile bird species (such as geese and ducks) attach to and follow the first moving object they see after hatching.
Lorenz identified that this process must occur within a critical period - typically just a few hours after birth or hatching. If imprinting doesn't happen during this narrow time window, the chicks won't attach to any mother figure at all.
Sexual imprinting
Lorenz extended his research to investigate how early imprinting experiences might influence later adult behaviour, particularly mating preferences. He discovered that birds which imprinted on humans often displayed courtship behaviour towards humans later in life.
Case Study: The Peacock and the Tortoises (1952)
A notable case study involved a peacock reared in the reptile house of a zoo. The first moving objects this peacock saw after hatching were giant tortoises.
Result: As an adult, the bird would only direct courtship behaviour towards giant tortoises rather than other peacocks.
Conclusion: This demonstrated sexual imprinting - where early imprinting experiences determine later species preferences for mating.
Lorenz concluded this demonstrated sexual imprinting - where early imprinting experiences determine later species preferences for mating.
Evaluation
Generalisability to humans
Although Lorenz's findings have influenced our understanding of human development, there are significant problems with generalising from birds to humans. The attachment systems in mammals appear quite different from those in birds:
Key Differences Between Bird and Mammalian Attachment:
- Mammalian mothers show more emotional attachment to their young than birds do
- Mammals can form attachments at any time during their lives, though this is easier during infancy
- The rigid critical period seen in birds may not apply to human attachment formation
These differences mean it's inappropriate to directly apply Lorenz's conclusions about imprinting to human attachment relationships.
Some of Lorenz's observations have been questioned
Later research has challenged some of Lorenz's key conclusions, particularly regarding the permanence of imprinting effects on mating behaviour.
Guitton et al. (1966) conducted a study with chickens that were imprinted on yellow washing-up gloves. Initially, these chickens attempted to mate with the gloves as adults (supporting Lorenz's sexual imprinting theory). However, with experience, they eventually learned to prefer mating with other chickens instead.
This finding suggests that the impact of imprinting on mating behaviour is not as permanent and irreversible as Lorenz originally believed. Early experiences may influence later preferences, but these can be modified through learning and experience.
Remember!
Key Points to Remember:
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Imprinting is the process by which newly hatched birds attach to the first moving object they see
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There is a critical period of just a few hours after hatching when imprinting must occur - if missed, no attachment forms
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Sexual imprinting means that birds may later show courtship behaviour towards whatever species they imprinted on as chicks
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Generalisability is limited - mammalian attachment systems work differently from bird imprinting, so findings cannot be directly applied to humans
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Permanence is questionable - later research suggests imprinting effects on mating behaviour can be modified through experience