Is there a direct relationship between how we feel inside and the interpretation of that feeling? Would a certain amount of adrenaline (Epinephrine) make us happy or sad? William James (1890) thought so. Internal changes (e.g. butterflies in stomach) occur because of an arousing event (e.g. an exam), and we interpret these internal feelings as an emotion. This is known as the James-Lange theory. When we trip, our heart pounds, we then feel annoyed or upset.
Walter Cannon (1929) disagreed, arguing:
Maraņon (1924) found that adrenaline alone did not produce an emotion; However, if the subject was questioned first about a painful event, the adrenaline then produced emotional upset. The subject before the injection would not be upset by the thought of the emotional event.
Schachter and Singer propose a two-factor theory, which suggests that in order to experience an emotion one needs both physiological arousal and a cognition. The cognition would explain the physiological arousal in terms of the current events or thoughts.
Adrenaline injection produces an increase in systolic blood pressure, an increase in heart rate, a decrease in cutaneous blood flow, muscle and cerebral blood flow increases, blood sugar and lactic acid concentrations in the blood increase, and respiration rate increases. Saline injection produces no physiological effect. This injection controls for the effect of being injected. Subjects could be aroused by simply having an injection.
All subjects told they are being used to test the effectiveness of a [fictitious] vitamin supplement called 'Suproxin'. Suproxin is supposed to improve the eyesight. A test is to be given as soon as the Suproxin has taken effect in approximately 20 minutes time. All of this is purely a cover story to disguise the real purpose of the experiment (reduce demand characteristics).
A doctor checks the subjects pulse before administering the injection.
Informed Condition- subjects are told to expect the above listed effects of adrenaline. They are not told it is adrenaline.
Misinformed condition - This condition is to control for auto-suggestion. This might cause the subjects to feel they are experiencing the effects of adrenaline simply because they were told to expect the effects (e.g. if you are told you look ill, you might actually believe that you are, and then feel as if you are ill). The subjects are told to expect numb feet, itching and a headache. Adrenaline does not produce such effects.
Ignorant condition - subjects are not told of any side-effects.
Euphoria condition - this is designed to allow the subject to label their physiological arousal (or non-arousal) as the feeling of happiness. The subject is asked to wait in a room for twenty minutes and are falsely told that they need to wait for the effect of Suproxin to take effect. There the subject is left with a pretend subject (the experimenter's stooge). The stooge goes through a prescribed routine designed to involve the subject in manic behaviour, and thereby produce a reason for the subject to feel happy. The activities are:
Anger condition - The subject is left in the room with the stooge. They are to fill in questionnaires. The questionnaire is supposed to make the subject have a reason for being angry, as the questions get progressively more personal. The stooge is there to encourage this angry feeling towards the experiment. The stooge starts by complaining about the injection. The stooge then keeps pace with the subject as the questionnaire is answered. The stooge adds negative comments about the questions. At the end of the session the stooge pretends to be so angry by ripping up the questionnaire. The experimenter then returns.
There are two types used - observation and self-report.
For each activity the extent to which the subject joined in was measured.
For each unit of activity the subject was coded according to how much they agreed or disagreed with the stooge.
Subjects behaviour | Example | Score |
Agrees | 'I don't like that kind of personal question either | +2 |
Disagrees | 'Take it easy, they probably have a good reason for wanting the information' | -2 |
Neutral | Non-committal or irrelevant response | 0 |
Initiates agreement | 'Boy, I hate this kind of thing' | +2 |
Initiates disagreement | 'I'm enjoying this' | -2 |
Watches | 0 | |
Ignores | -1 |
The subject had their pulse taken again.
A questionnaire was given. the subject was falsely told that the experimenter wished to find out whether there could be any other factors that would affect the eye-sight test. The two key questions, that were placed amongst many others were:
Other control questions were included to see whether the subjects had experienced any of the effects of the adrenaline, or had experienced any of the false symptoms that were given in the misinformed condition.
The subjects were male introductory psychology students at Minnesota university in the early 1960's. They received extra points on their final exam for participating!
Condition | Number of Subjects | Average Self-report scales |
Adrenalin Informed | 25 | 0.98 |
Adrenaline Ignorant | 25 | 1.78 |
Adrenaline Misinformed | 25 | 1.90 |
Placebo (Saline) | 26 | 1.61 |
As expected, the adrenaline misinformed group, and the adrenaline ignorant group, reported being happiest. This is because they experienced the effects of the adrenaline, and having no explanation as to why they felt that way, attributed the feelings to feeling happy. This result was significant (p is less than 0.01 {all values are 2-tailed}, adrenaline misinformed compared with adrenaline informed. Comparing adrenaline ignorant with adrenaline informed the significance level is 0.02).
Condition | Activity index |
Adrenaline Informed | 12.72 |
Adrenaline Ignorant | 18.28 |
Adrenaline Misinformed | 22.56 |
Placebo | 16.00 |
As expected, the adrenaline misinformed group joined in the activities more than the other groups. Comparing the adrenaline misinformed with the adrenaline informed the difference was significant at the 0.05 level. Unfortunately for Schachter and Singer the difference between the adrenaline ignorant and informed was not significant.
This didn't work. Most subjects were positive about their feelings. Schachter and Singer attribute this to the fact that they were students eager to please their tutors.
Condition | Number of Subjects | Anger Units |
Adrenaline Informed | 22 | -0.18 |
Adrenaline Ignorant | 23 | +2.29 |
Placebo | 22 | +0.79 |
As there was no real difference between the adrenaline misinformed and ignorant groups, the misinformed group was not used for the anger conditions. We can conclude that the information about side effects did not produce auto-suggestion, and therefore the subject's experience of any side-effects was real.
For anger units, there was a significant difference between the adrenaline informed and adrenaline ignorant conditions, in the expected direction (ignorant getting angrier). p is less than 0.01.
The placebo group are moderately angry, coming between the other two conditions. Comparing the placebo group to the adrenaline ignorant group the difference is significant, with p less than 0.05.
Schachter and Singer found that a number of subjects reported that the needle gave them the "shivers". This could well have raised natural adrenaline levels, or could have given the subjects a reason for any side-effects that they experienced. Schachter and Singer re-analysed the results excluding these subjects, and found that significance levels increased.
Evaluation of Schachter-Singer's Theory
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