Experimental Conditions

1. The subjects stared at a crosshair on a computer monitor while their brain activity was monitored via PET imaging.

2. Common English nouns appeared on the screen (visual), or were heard over earphones (auditory). The presentation rate was 40 words a minute.

3. The subjects were asked to speak the words that they saw or heard.

4. The subjects were asked to say aloud a use appropriate for the noun they either viewed or heard. e.g., if the word was 'hammer' an appropriate response would be 'hit'

 

The images were generated by subtraction of the PET images from each other as follows:
Hearing Words	2(auditory)-1
Seeing Words	2(visual)-1
Speaking Words	3-2
Generating Words	4-3

1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11