Generic Inderal -LA (Propranolol, Inderal -LA® equivalent)
Propranolol is in a group of medications called beta-blockers. Beta-blockers affect the heart and circulation of blood flow. Propranolol is used to treat tremors, angina (chest pain), hypertension (high blood pressure), heart rhythm disorders, and other heart or circulatory conditions. It is also used to treat or prevent heart attack, and to reduce the severity and frequency of migraine headaches. Propranolol may also be used for purposes other than those listed in this medication guide.
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40mg
| Quantity | Price | Price per pill | Returning customer price | Bonus | |
|---|---|---|---|---|---|
| 30 | € 40.28 | € 1.34 | € 35.72 | ---- | Add to cart |
Drug Medical Information
AGE AND BEHAVIOR: SLOW RESPONSE TO ENVIRONMENTAL STIMULATION – CENTRAL MECHANISMS - PSYCHOPHYSIOLOGICAL CORRELATES - EEG
If central factors are antecedent to RT, and if set, as manipulated by the PI, is important in RT, it is reasonable to expect that variations in psychophysiological indices of central functioning should be reflected by variations of the PI and, in turn, should reflect variations in RT. This expectation has only minimally been substantiated. Two major psychophysiological processes have been examined; one is the alpha wave function of the electroencephalogram (EEG), and the other is cardiac rhythm, as it is thought to influence brain stem activity. EEG. When with environmental stimulation the alpha waves of the EEG are blocked, the person is said to be aroused, activated, or alert. This concept may not be unlike the concept of RT set, expectancy, or readiness, which is manipulated by PI variations. If blocking or other change of the alpha wave represents an activated state of the responder, then it might be expected that this would be associated with quicker response and with PI variations. There are various measures of changes in the alpha wave of the EEG that could be used. Thompson and Botwinick (1968) measured change in EEG amplitude to analyze activation patterns in both young adults (19-35 years) and in older ones (62-87 years). This pattern was examined in relation to different PIs in both regular and irregular series, with the finding that the two age groups were very different in their EEG activation patterns. From these results it would have been very tempting to explain the RT slowing with age on the basis of EEG activation had it not been for an additional finding. In this study, RT and EEG activation were unrelated. Thus, EEG activation was not seen as an explanation of the slowing with age. Quite a different conclusion was reached by Surwillo (1961, 1963). He analyzed alpha period (the inverse of frequency) as a correlate of RT. Surwillo did not intend to vary PI and, in fact, did not utilize a warning signal—he used only a stimulus. But he varied the time between stimulations and thus effectively had a type of irregular RT series. Surwillo also had, during the end part of his procedure, a condition which he called "high vigilance, high motivation." This condition was of a stimulus duration much shorter than he had used earlier in the study. In this "alerted" condition, the mean RT and the mean alpha period were computed for each subject and found to be highly correlated (r = .72). Surwillo (1963, p. 112) concluded, "It appears, therefore, that frequency of the EEG is the central nervous system factor behind age-associated slowing in response time." The conclusion, while possibly correct, does not fit his finding that the correlation between age and RT was very low. *224\220\8*
