Exact(7)
A 2 × 3 design varied the number of flashes (1 or 2) with the number of beeps (0, 1, or 2) presented on each trial, such that '2F1B' refers to the presentation of 2 flashes with 1 beep.
When 2 flashes and 1 beep were presented, participants perceived 1 flash (i.e. fusion illusion [7]) on 52% of the trials (see Table 1).
When contrasting limb velocity at stimulus midpoint (i.e. 50 ms after stimulus onset) with the number of perceived flashes in the 2 flashes with 1 beep condition, we observed across all experimental trials presenting 2 flashes and 1 beep that the fusion illusion was linearly reduced as a function of limb velocity (see Figure 2).
For example, when presented with 2 flashes and 1 beep in a very brief period of time, humans often report seeing 1 flash (i.e. fusion illusion, Andersen TS, Tiippana K, Sams M (2004) Brain Res.
For example, it has been reported that the perceived number of brief visual flashes is influenced by the number of short accompanying beeps [7] (e.g. 2 flashes accompanied with 1 beep often yields the perception of 1 flash: i.e. fusion illusion).
When 2 flashes accompanied 1 beep, participants reported 1 flash (i.e. fusion illusion) more often in the early and late portions of the movement (i.e. 0 ms and 200 ms conditions corresponding to the lowest limb velocities) than in the 50 ms and 100 ms conditions (i.e. at the highest limb velocities) (ps<.02).
Similar(52)
The original illusion (Shams, 2000) was replicated as the number of correct responses in the 1 flash/2 beeps condition was drastically reduced (Figure 4a).
We fixed the task order across participants in each block to optimize performance as follows: 2 Hz beeps with no movement, 2 Hz isorhythmic tapping, 2 Hz polyrhythmic tapping (2 Hz beep, 3 Hz movement; 3 Hz beeps with no movement, 3 Hz isorhythmic tapping, 3 Hz polyrhythmic tapping (3 Hz beep, 2 Hz movement).
5.32am GMT 13th over: Australia 51-2 (Rogers 21, Clarke 0) Lead by 222 BEEP! No, there is definitely BEEP! some sort of beeping.
Two different sounds were used as external feedback; a 74 Hz beep (55 ms) indicating an error and a 740 Hz beep (55 ms) indicating a correct answer.
More importantly, there is no significant effect of feedback on how performance (proportion of reported "multiple") differs between the no-sound and 2-beeps conditions (performance(no-sound) − performance 2-beeps)) in neither 1-flash (performance 2-beepsshes (0.24) trinls.
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