According to Eysenck (1967) we are born with a unique temperament with a genetic basis, and personality can be measured by dimensions on a continuum. The dimensions labelled by Eysenck consist of, extraversion/introversion, neurotic/stable, and psychotic each dimension has specific traits or characteristic’s related to them.
Freud (1923) Suggested our personality is governed by our unconscious thoughts, Freud’s theory involves what he termed the id, which is based on biological drive and desire for instant gratification which develops up to the age of 2 or 3, then the ego is developed through external experiences, the ego distinguishes boundaries of rationality and is developed up to around 5 years of age, then modification of the ego to super ego , the super ego sculpted by experiences develops a sense of morality. The theory is based on sexual drives, based on stages of development influencing a person’s response to stimulus represents aspects of the development of personality.
Eysenck (1967) suggested that people on the high end of the scale of extraversion are searching for stimulus due to lower levels of brain activity and the opposite is for people who are considered to be introverts.
Research by Green (1984) demonstrated how a group of introverts and extroverts participated in a mundane task, the extroverts had chosen a higher volume of music whilst participating in the task comparatively to the introverts, under their chosen music volume levels both groups had displayed task efficiency. Interestingly when the volume levels were swapped around amongst the two groups’ task efficiency had been less effective.
According to the following research Mitchell & Kumari (2016)Using MRI and DTI and assessing the evidence over the past 15 years , were able to establish Eysenck’s theory, examining extraversion and introversion had a correlation to the function of different brain regions Including cortical regions involved in emotion regulation including limbic regions. Suggesting neuroticism is particularly sensitive to negative emotional cues and extraversion is sensitive to positive emotional cues.
According to Eysenck (1986) he implies Freud’s theories can be classed as science and can be falsified, which a different view is than Popper (1986) who suggests Freud’s theories cannot be falsified therefore not considered scientific.
Lo, Hinds,Tung, Franz, Fan,Wang, and Chen (2017) identified genetic spectrum of correlations between certain genes and FFM personality traits.
Twin studies (Hur, 2007) demonstrates how identical twins are more likely to demonstrate similar personality traits, compared to fraternal twins, and biological siblings are more likely to have similar personality traits then adopted sibling’s, this is significant because it suggests that a biological foundation to personality.
According to Laurent (2015) it is Impossible to eliminate the genetic variable which could potentially correlate with Child development correlation with adult development. The empirical research around Freud’s development theory is limited subjective experience.
Revelle, 2016 suggested Eysenck’s has left a strong legacy and influence field of psychology for example the neuroticism and extraversion of the FFM
Empirical and theoretically Eysenck theories on personality are more plausible than Freud. The evidence around biology around personality is overwhelming
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Lo, M.-T., Hinds, D. A., Tung, J. Y., Franz, C., Fan, C.-C., Wang, Y., … Chen, C.-H. (2017). Genome-wide analyses for personality traits identify six genomic loci and show correlations with psychiatric disorders. Nature Genetics, 49(1), 152–156. http://doi.org/10.1038/ng.3736
Mitchell, R. L. C., & Kumari, V. (2016). Hans Eysenck’s interface between the brain and personality: Modern evidence on the cognitive neuroscience of personality. Personality and Individual Differences, 74-81. DOI: 10.1016/j.paid.2016.04.009
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Revelle, W. (2016). Hans Eysenck: Personality theorist. Personality & Individual Differences, 10332-39. doi:10.1016/j.paid.2016.04.007