Thursday, December 08, 2005

Presentation Transcript

“Music Perception”
Differential Brain Response to Metrical Accents in Isochronous Auditory Sequences
By Donna Abecasis and others
Equidistant Tones: as it Relates to the Brain and Groupings
What makes for the meter of a song?
(4 quarter notes on the same line repeated)
Grouping in Music Introduction
1) Very Basic Process that occurs because of memory stipulations
2) Statistics
I. Children and Adults Alike
II. Leads to accents (Strong vs. Weak Beats)
3) Accents are a basic form of organization that starts through brain waves. Your brain waves cause the accent, the accent does not cause the brain wave.
Example: The way people say words sometimes depends on where they
think the accent lies in the word or phrase.
I. Phenomenal Accents-any events in music that have a stress was researched in this article and is the basis for it
II. (aside)Structural accents and Metrical accents exist but are not emphasized
III. Accents are then organized into what is called events or happenings

3b) Recap grouping to accentuation and emphasize the word events
3) Events (actions) are the time that one note or “event” takes can cause it to be accented simply because of the way the line is written by the composer. Also the pitch and other factors can lead to accentuation. So, different properties can also lead to a note being accented.
Some theories say: An accent is an event... An attention getting event
Theory 2 Says: Changes are better processed on accented events than on unaccented ones.

4) Now we arrive at the question of the day. What happens when there are no changes in stimuli? So, can we prove that accentuation starts in the mind not just in events that cause accentuation?
5) With the use of identical sound and time sequences (reference the quarter note example) we can begin to experiment and make some conclusions.
6) People will generally report that they hear a group of tones (usually 2,3, or 4 tones) with an accent on the first tone of each group. (Subjective Rhythmization)
7) So, we could simply ask people are since accents are attention getting events, we can measure brain waves to come to a more substantial answer.
8) Components of measurements for brain waves are used to measure auditory significance.
9) Now that a conclusion has been reached about holding each note constant, we can move on to change one note to be higher or lower but hold all else constant….i.e. hold rhythm constant.
I. So, the the beats that were tested was 8,9,10 and11.This gives the individual time to hear accented rhythms in their mind.
II. A change in the tone of was placed on each one of the following beats. But each time the tone was changed, It was changed to be the exact same tone just in a different place in the number of tones 8, 9, 10, and 11.
10) The conclusion ended up being that peoples brain activity increased more on the oddly numbered events where changes occurred on the evenly numbered events.
Explain: 8 and 10 versus 9 and 11
Experiment Concluded
11) What if the changes occurred by making one beat longer and holding all else constant?
12) Used an alternating long-short pattern(Binary) and long-short-short pattern(ternary) holding everything else equal.
13) Used EEG recording for brain waves and the same techniques or changing the 8,9,10, and 11 tones were implied only with elongation being the change not a change in the tone.
14) Two groups were separated (binary and ternary) and a control group was used.
15) Data collected supported the hypothesis that on the “weak beats” people response would be height. (Significantly larger amplitude in 9 and 11)
Refer to page 7

5 Comments:

Blogger Keely said...

The format you've posted in here is a little difficult to read, but I thought your presentation was fine.

Friday, December 09, 2005 10:50:00 AM  
Blogger gfunk5 said...

Some of your presentation was a bit choppy- make sure there is a flow, so people can keep with you. Great information.

Friday, December 09, 2005 5:27:00 PM  
Blogger violinbrunetka said...

Good information, when you presesnt it. You kinda need to fix the way you wrote it out.

Friday, December 09, 2005 9:49:00 PM  
Blogger Annie said...

When you're using a script-- make sure you use it! Re-explaining yourself made it somewhat confusing at times--- but nice article- it was very interesting!

Saturday, December 10, 2005 12:07:00 AM  
Blogger saxubatar said...

Lots of energy in the presentation...nice! Is this really a script, though, or a general outline? It's what I would normally use, but I thought the assignment was a bit different.

Saturday, December 10, 2005 11:34:00 PM  

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