In Concurrent trials (a spatial 3AFC), three visual streams were presented concurrently, along with a single audio stream (see Figure 2B).
The first experiment examined the effect of caffeine on the acquisition of ethanol intake in a limited-access-choice procedure in which water and ethanol were presented concurrently.
The tourism bureaus of western Massachusetts will probably not want to send potential visitors to "The Hill Town Plays," the cycle of five dramas by Lucy Thurber that is mostly set in those leafy parts, and whose plays are being presented concurrently across stages in Greenwich Village, courtesy of the Rattlestick Playwrights Theater.
These five ratings were made on separate rating scales and scales were presented concurrently on the same screen as the photos.
In bimodal blocks, auditory and visual stimuli were presented concurrently, and subjects were cued to attend to the auditory (BA blocks) or visual (BV) modality.
Recordings were made in situations where only one amplitude modulated (AM) tone (i.e. one auditory object with a particular periodicity) was presented as well as in situations where two AM tones were presented concurrently (see Fig. 1F).
To test whether responses increased as the number of flashes presented increased, and whether this relationship changed depending on whether beeps were presented concurrently, the mean responses were submitted to a repeated measures ANOVA.
It can be seen that for one to three flashes, the measured responses (whether a beep was presented concurrently or not) are close to the reference line, indicating that for up to three flashes the stimuli are relatively easy to perceive.
The critical manipulation was whether the two visual event streams were presented concurrently (in two separate spatial locations – a spatial 2AFC task; see Movie S2) or sequentially (in discrete intervals separated by 1000 ms – a temporal 2AFC task; see Movie S1).
Results show that latency differences that could explain the RT cueing effects must occur after visual selection processes giving rise to the N2pc, but at or before transfer in visual short-term memory, as reflected by the SPCN, at least in discrimination tasks in which the target is presented concurrently with at least one distractor.
