Neuroscience 2005 Abstract
| Presentation Number: | 581.6 |
|---|---|
| Abstract Title: | Conscious and unconscious category adaptation aftereffects in emotional face perception. |
| Authors: |
Van Rijsbergen, N.*1
; Treves, A.1
1Dept Cognitive Neurosci, SISSA, Trieste, Italy |
| Primary Theme and Topics |
Cognition and Behavior - Human Cognition, Behavior, and Anatomy -- Learning and long-term memory |
| Session: |
581. Learning and Long-Term Memory III Slide |
| Presentation Time: | Tuesday, November 15, 2005 9:15 AM-9:30 AM |
| Location: | Washington Convention Center - Room 143A |
| Keywords: | FACIAL, VISUAL PERCEPTION, MODELING, MEMORY |
We report data that measure the extent to which the category adaptation aftereffect (Webster 2004) depends on the subject's conscious perception of the adapting stimulus.
We describe the results of experiments investigating adaptation of categorical perception boundaries for emotional faces, morphed within identity between neutral and emotive. We manipulated adaptation both with a pre-task adaptation phase and with a prime stimulus, which was either, presented for 500 ms and consciously perceived, or for 22 ms and backward masked, at various prime-test intervals. We analyzed the effects of the prime and of the adaptation phase and their interaction.
We replicate the findings of Webster, but our data suggest that the adaptation of the category decision boundary is due to the superimposition of a perceptual and a task factor that also produce separable effects in the reaction time data. We also examine the emergence and decay of adaptation in the reaction time data, which we argue is a better measure of a change in the perception of the stimuli than change in the classification performance at the boundary that might result from a criterion shift.
Prior to the categorization task subjects were adapted to either a neutral or emotional endpoint over 2 minutes. Figure 1 (upper) shows the change in boundary with respect to adaptation direction for primes of 500ms (N= 20), and Figure 2 shows a task effect of ‘prime’ versus ‘no prime’ on reaction times (N=17) and the change in RT peak due to adaptation direction.
We describe the results of experiments investigating adaptation of categorical perception boundaries for emotional faces, morphed within identity between neutral and emotive. We manipulated adaptation both with a pre-task adaptation phase and with a prime stimulus, which was either, presented for 500 ms and consciously perceived, or for 22 ms and backward masked, at various prime-test intervals. We analyzed the effects of the prime and of the adaptation phase and their interaction.
We replicate the findings of Webster, but our data suggest that the adaptation of the category decision boundary is due to the superimposition of a perceptual and a task factor that also produce separable effects in the reaction time data. We also examine the emergence and decay of adaptation in the reaction time data, which we argue is a better measure of a change in the perception of the stimuli than change in the classification performance at the boundary that might result from a criterion shift.
Prior to the categorization task subjects were adapted to either a neutral or emotional endpoint over 2 minutes. Figure 1 (upper) shows the change in boundary with respect to adaptation direction for primes of 500ms (N= 20), and Figure 2 shows a task effect of ‘prime’ versus ‘no prime’ on reaction times (N=17) and the change in RT peak due to adaptation direction.
Supported by Human Science Frontier
Sample Citation:
[Authors]. [Abstract Title]. Program No. XXX.XX. 2005 Neuroscience Meeting Planner. Washington, DC: Society for Neuroscience, 2005. Online.
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