Mental Rotation Essay

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Mental rotation Mental rotation is another classic cognitive psychology paradigm, which was devised by Roger Shepard at Stanford. To understand how this task works, take a look at the shapes in the top panel (A) of Figure 12.3. The two shapes are the same; the one on the right has been rotated clockwise by about 90°. By contrast, the pair of shapes on the bottom row (B) do not match. If you look carefully, you will notice that they are mirror- Earworms and Imagery 5 images of each other, so that even if you rotate the shape on the left clockwise by 90°, it won’t match up with the shape on the right. In the mental rotation task, subjects are pre- sented with pairs of 2-D or 3-D shapes, and asked whether they are mirrored or non- mirrored. …show more content…

Instead of a map of an island that subjects had to hold “in their mind’s eye”, Halpern had subjects imagine a tune “in their mind’s ear.” She used familiar songs for which almost everyone knows the melody and lyrics. For example, the first line of The Star Spangled Banner is “Oh, say can you see, by the dawn’s early light.” The task is to compare the pitch of different notes in the song, which we can conveniently refer to using the lyrics. Is the first note (“Oh”) higher or lower than the third note (“can”)? You’re not allowed to sing or hum the tune — you have to imagine it in your head. Most people find this to be a hard task. It’s even more difficult when the notes are spaced further apart in time, for example when comparing “Oh” with “Dawn’s.” Halpern found that reaction time in this task was directly proportional to the separation in time between the notes (Figure 12.7). Using the same logic as the mental imagery tasks, the claim is that this shows that mu- sical imagery uses a mental representation that has extension in time, just like actual music does. Just like a mental image has properties of distance and spatial relation- ships, the idea here is that the mental representation of a tune in your head has the property of existing in time, and the property of having temporal relationships (notes can be nearer or further apart in time). Put another way, you can’t randomly access any …show more content…

The strongest hypothesis would be that the brain areas involved are identical for imagery and perception, but this is almost certainly not the case. Despite how vividly detailed music in your head can be, you can tell the difference between music in your head and actual music. The only cas- es where people can’t tell the difference are musical hallucinations, which are the sub- ject of Chapter 15. How much overlap is there in the brain areas involved? The two broad approaches in the cognitive neuroscience tool kit are lesion studies and brain Earworms and Imagery 7 imaging. Both of these approaches have been brought to bear on the brain mechanisms underlying musical imagery, and we’ll address each approach in turn. Lesion studies of musical

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