Modulation of Electrocortical Brain Activity by Attention in Individuals with and without Tinnitus

Figure 2

Auditory task. Upper panel: three standard 40 Hz AM stimuli and one target stimulus containing a single amplitude-enhanced AM pulse (target) are illustrated by cartoons containing 8 AM pulses (40 pulses were delivered on each trial). Approximately 2/3rd of the stimuli contained a target of variable enhanced amplitude such that not all targets were detectable. Lower panel: on active blocks participants identified whether a target was present or not; on passive blocks participants ignored the sounds and waited for the next active block. Blocks contained 54 trials and alternated between active and passive blocks for a total of 20 blocks per session.