Library

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    European archives of psychiatry and clinical neuroscience 233 (1983), S. 471-488 
    ISSN: 1433-8491
    Keywords: Event-related potentials ; CNV ; PINV ; PCA ; Anhedonia ; Stimulus discrimination ; Depression ; Ereigniskorrelierte Potentiale ; CNV ; PINV ; PCA ; Anhedonie ; Zusätzliche Reize ; Depressionen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Ereigniskorrelierte Potentiale (langsame Potentiale, evozierte Potentiale) und autonome Reaktionen wurden in einem S1–S2-Reaktionszeitparadigma bei Personen erhoben, die auf einer Anhedonieskala hohe oder niedrige (Kontrollgruppe) Werte aufwiesen. Die Verteilung der Anhedoniewerte wurde für verschiedene Gruppen (Studenten, Soldaten, Schizophrene, Depressive) verglichen. Während des sechssekündigen Antizipationsintervalles wurde in 50% der Durchgänge (zufällig) ein dem imperativen Reiz ähnlicher Reiz dargeboten; die Probanden sollten aber nur auf den S2 hin mit Knopfdruck reagieren. Bei Probanden mit hohen Anhedoniewerten zeigt sich gegenüber Kontrollpersonen eine stärkere negative langsame Potentialverschiebung vor dem Zeitpunkt des zusätzlichen Reizes (AS) sowie ein geringerer Rückgang der Negativierung nach dem S2 (PINV). Die Negativierung vor dem AS sowie die ‚'slow wave” auf den S1 variieren mit der bedingten Wahrscheinlichkeit des AS, jedoch weniger deutlich bei Anhedonikern. Der AS selbst löst bei allen Probanden eine positive Verschiebung aus. Die Ergebnisse lassen eine beeinträchtigte Fähigkeit zur Kontingenzermittlung bei Anhedonikern vermuten.
    Notes: Summary Slow brain potentials, evoked potentials and autonomic responses were investigated in anhedonic subjects and controls. The distribution of physical anhedonia (PA) scores from different samples (students, soldiers, schizophrenics, depressives) is compared. Within a S1–S2 reaction time paradigm, an additional, S2-similar stimulus was introduced during the anticipation interval in 50% of trials (pseudorandom). Subjects had to press the button only to the S2. The additional stimulus (AS) elicits a distinct positive deflection. Anhedonics show larger pre-AS negativity and less reduction in negativity after the S2 (PINV) than controls. The slow wave to S1 as well as the pre-AS negativity vary with the conditional probability of the AS, but to a lesser extent in anhedonics. Anhedonics provide more preparatory negativity prior to and following ambiguous or difficult discrimination tasks, but at the frontal site. Results may suggest impaired contingency evaluation in anhedonic subjects.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Applied psychophysiology and biofeedback 9 (1984), S. 139-160 
    ISSN: 1573-3270
    Keywords: slow brain potentials ; even related potentials ; EEG conditioning ; sensorimotor rhythm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Research on operant control of brain potentials is reviewed. From single-unit firing and spontaneous EEG activity to event-related potentials such as sensory and pain evoked potentials, and slow potential shifts, most of the aspects of electrical brain activity have been investigated. Results produced by conditioning of spontaneous EEG oscillations (alpha and theta) dampened the early enthusiasm: e.g., no increase above baseline levels could be achieved and no reliable behavioral effects became manifest. Evidence accumulates, however, that operant conditioning of the sensorimotor rhythm (12–15 Hz) may lead to successful self-regulation and that epileptic patients may profit from the training. First steps in the conditioning of brainstem, as well as pain evoked potentials suggest that self-regulation of EPs can be achieved by adequate biofeedback procedures. If some of the observed behavioral effects prove to be stable, the therapeutic usefulness seems to be within reach. A comparable progress has been achieved for the operant control of slow potentials (DC-shifts across seconds). Biofeedback procedures have been used successfully as a scientific tool to achieve systematic variations on a psychological level and to record psychological covariations. This method may provide insights into the behavioral meaning of electrical brain activity.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...