Effects of Propranolol on the Encoding and Retrieval of Emotional Material After Single Dose Administration in Healthy Young Subjects
- To evaluate the effects of a single oral (80 mg) dose of propranolol on the encoding of emotional pictures as assessed by peripheral physiological and electrocortical parameters in a healthy population.
- To evaluate the effects of a single oral (80 mg) dose of propranolol on the retrieval of emotional pictures as assessed by electrocortical parameters in a healthy population.
- To evaluate correlations between behavioral data and psychophysiological parameters.
Skin Electric Conductance
|Study Design:||Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double Blind (Subject, Caregiver, Investigator)
Primary Purpose: Basic Science
|Official Title:||Effects of Propranolol on the Encoding and Retrieval of Emotional Material After Single Dose Administration in Healthy Young Subjects|
- memory performance for pictures
- heart rate and heart rate variability
- blood pressure
- skin conductance and responses electrocortical activity
- α-amylase activity in saliva
- tolerability of propranolol
Active Comparator: study day 1 propanolol
Oral administration of 80 mg propranolol (1 capsule containing two Obsidan® tablets: 2 x 40 mg propranolol) according to randomization list with 240 ml. Determination of blood pressure, heart rate over 4 hours and until return to the initial baseline values.
Oral administration of 80 mg propranolol (1 gelatine capsules; content: 2 tablets of Obsidan® 40 mg Tablets) or placebo (1 gelatine capsules; content: 1 tablet placebo; microcrystalline cellulose, magnesium stearate, cellulose powder, lactose monohydrate) according to randomization list with 240 ml tap water.
Placebo Comparator: study day 1 placebo
Oral administration of placebo (1 capsule containing two placebo tablets) according to randomization list with 240 ml. Determination of blood pressure, heart rate over 4 hours and until return to the initial baseline values.
Oral administration of placebo (1 gelatine capsules; content: 1 tablet placebo; microcrystalline cellulose, magnesium stearate, cellulose powder, lactose monohydrate) according to randomization list with 240 ml tap water.
The main objective of the present study is to combine two lines of research investigating the interaction between emotional processing and memory performance and its modulation by beta-blockade. As has been suggested by aforementioned lesion, pharmacological and neuroimaging evidence, emotional stimuli are better remembered because they are better encoded.
In the ERP literature, there are a number of studies on emotion and memory, but few of them have investigated the modulatory effects of emotion on memory, focusing on either during stages of encoding (Palomba, Angrilli & Mini, 1997; Dolcos & Cabeza, 2002) or during memory retrieval of emotional and neutral material (Maratos & Rugg, 2001; Windmann & Kutas, 2001). It is assumed that emotionally arousing information gains privileged access to processing resources. This means that emotional arousing stimuli guide attention for more elaborated processing, leading to better memory formation.
Concerning pharmacological manipulations with ß-blockers, there is no existing ERP study that shows the effect of ß-blockade on encoding processes and memory retrieval of emotional pictures. Therefore, the current investigation was designed to test whether recall and recognition of emotional pictures can be reduced by administration of propranolol and whether this reduction in memory performance is correlated with changes in event-related potentials or peripheral physiological parameters (heart rate variability, heart rate, blood pressure and electrodermal response). As a surrogate for sympathetic activity and/or activation by noradrenaline, a salivary sample to measure activity of the alpha-amylase will be employed (van Stegeren, Rohleder, Everaerd & Wolf, 2006) In conclusion, we hypothesize (1) a memory advantage for emotionally arousing stimuli but not for emotionally neutral pictures. (2) ERP components associated with emotional effects and memory effects are pronounced for emotional stimuli. (3) Peripheral physiological parameters should also be pronounced for emotionally arousing stimuli. (4) Emotional processing and emotional memory will be impaired by the beta-blocker propranolol as indicated by behavioral data and psycho-physiological parameters.
Please refer to this study by its ClinicalTrials.gov identifier: NCT00889096
|Department of Clinical Pharmacology, Ernst-Moritz-Arndt-University Greifswald|
|Greifswald, Mecklenburg-Vorpommern, Germany|
|Principal Investigator:||Werner Siegmund, Prof||Department of Clinical Pharmacology, Ernst-Moritz-Arndt-University Greifswald|