auditory perception auditory perception false signal detection
Conditions
Interventions
None listed
Sponsors
Durham University
Eligibility
Age
18 Years to 99 Years
Inclusion criteria
Inclusion criteria: 1) participants are aged between 18-35 2) participants are right-handed 3) speak fluent English; 4) do not report any known hearing impairments (to be tested before the first tDCS-session) 5) signed informed consent
Exclusion criteria
Exclusion criteria: 1) (suspected) pregnancy 2) not signing the informed consent 3) family history of epilepsy 4) non-removable metallic objects on the head or arms, 5) a history of skin conditions (e.g., eczema).
Design outcomes
Secondary
| Measure | Time frame |
|---|---|
| we will repeat the analysis with: - task sensitivity (d') on the signal detection task as the dependent variable, which will be calculated as d' = Z(H) * Z(FA). - raw false alarm rate on the signal detection task as a dependent variable. False alarm rate will be defined as the percentage of trials on which no stimulus is presented on which the participant responds *yes*. - planned contrast between superior temporal condition and mean of the two other conditions for voice auditory stimuli. - the interaction between stimulus condition (superior temporal, sham or non auditory cortex) and stimulus type (voice or non-voice). | — |
Primary
| Measure | Time frame |
|---|---|
| The dependent variable which will serve as the primary outcome measure will be response bias (*) on the signal detection task, corresponding to the *externalising bias*. This will be calculated according to the following formula, as recommended by Stanislaw and Todorov (1999): *=e{(*Z(FA)*^2- *Z(H)* ^2)/2}. Z(FA) refers to the standardized false alarm rate (that is, the proportion of trials on which a participant incorrectly responds *yes* when no voice or tone is actually present), whilst Z(H) refers to the standardized hit rate (that is, the proportion of trials on which a participant correctly responds *yes* when a voice or tone is presented). Lower * values refer to a more *liberal* response bias. -3x2x2 way ANOVA [stimulus condition x stimulus type x time point] with a Bayes factor as an evidence | — |
Countries
Netherlands
Outcome results
None listed