PSY WK6 A2

Osayame Evbuomwan

10/15/16

Individual differences in physiological functioning and behavior.

Previously five respondents had filled the Chess and Buss Scale. I obtained the forms and proceeded to score the final score results. This study was conducted with the aim of studying different individual personalities in terms of physiological functioning and behavior.

Here are my findings after successfully administering the lemon juice procedure on all the five respondents.

Reactions

There were 3 participants who reported that the lemon juice was sour with one participant reporting it to be bitter.

There was one participant who reported the taste of lemon juice on their tongue to be okay with no facial reaction shown.

Reasons for their Reaction

This justification for respondents’ sour face and sour tastes is because they anticipated the drink in the cup to be lemon without sugar. It could also be because they anticipated lemon to be sourer. This was also observed in their sour faces as they held the cup close to their mouths before they drank.

Difference

The noticeable differences include the;

I. the difference in tastes

II. the differences in the reactions i.e. bitter, sour, and okay

III. the reactions before drinking the lemon juice

Analogy with Eysenck’s Prediction

The analogy is on point to Eysenck’s Prediction as extroverts indeed have higher sensory thresholds and less arousal cortices as compared to introverts with lower sensory thresholds and higher arousal cortices.

However, the analogy is different in ways of participants who don’t show any reaction; those we would refer to as “ambiverts” who are neither introvert nor extroverts. The tool could therefore be made better to cater for ambiverts, therefore to some extent, Eysenck’s Prediction is not true.

Conclusion

Introverts and extroverts have different personality behaviors. Extroverts are more social and blend well with the outside world as well as the environment. On the other hand, Introverts prefer their own company and are less social than their counterparts.

In terms of the relationship between introversion/extraversion with cortical arousal of the brain's reticular formation. The lemon juice procedure has in a way proven that indeed there exists a link with the introvert reporting of increased saliva after ingestion of the juice.

Lemon Juice Experiment Data

Participant	Facial Expression	Verbal Report
1	No facial reaction	It’s Okay
2	Sour face	Fairly sour
3	Sour face	Sour
4	Sour face	Sour
5	Bitter Face	Bitter