Independent and parallel visual processing of ensemble statistics: Evidence from dual tasks

1.

2. Independent and parallel visual processing of ensemble statistics: Evidence from dual tasks

3. An example

4. Greater or smaller than average?

5. Ensemble summary statistics

6. Independence

MEAN
NUMEROSITY
RANGE

7. Correlational approach

Different
sources of
noise
One source of
noise
No correlation
between errors in reports
of different statistics
Correlation
between errors in reports
of different statistics

8. Parallelism

MEAN
NUMEROSITY
REPORT
REPORT
VARIANCE
REPORT
MEAN
NUMEROSITY
REPORT
VARIANCE

9. Parallelism test

Single task
Observers should compute
only one statistics
Dual task
Observers should compute
both statistics

10. Parallelism test

No interference
Error in
single task
Error in
dual task
Interference
Error in
single task
Error in
dual task

11. Experiment 1

12. Procedure

13. Design

3 blocks
MEAN
NIMEROSITY
BOTH
6 “variables”

14. Data analysis

Error =
о