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The Ground Side of an Object: Perceived as Shapeless yet Pro

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maddie brennan

on 21 November 2013

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Transcript of The Ground Side of an Object: Perceived as Shapeless yet Pro

The Ground Side of an Object: Perceived as Shapeless yet Processed for Semantics
Sanguinetti, Allen, Peterson (2013)

Experiment 2
Similar to Experiment 1 except there was an added element of semantic reflection
Match word
Mismatch word
Hypothesis:
If semantic accessing does occur for grounds then responses to the meaningful ground silhouettes would be reduced in the matched condition as compared to the mismatched condition

Limitations & Future Studies
-ERP's do not tell us where in the brain semantic processing occurs

-look at what areas of the brain are involved in processing meaning

-address the Where and How

-study discards to gain insight about conscious perception and semantic processing
Experiment 1

Procedure
Participants
Stimuli
meaningful vs. novel
object vs. ground


Results
The N300 and N400 amplitudes were reduced when the semantics of prime words and unseen meaningful objects on the ground side of silhouettes matched
Discussion


-semantic processing can occur for unseen meaningful objects on the ground side of perceived objects

-the brain processes shapes to their level of meaning even though the participant does not

-brain processes all information and then determines the best interpretation of the information

-contradicts traditional hypothesis that semantic representations are accessed only after object segregation
Questions?
Procedure
Same silhouettes from Experiment 1
Task was to classify the silhouettes as novel objects or real-world objects
120 in total; 3 groups; 40 slides divided up with 20 for each condition
Done in 2 blocks-within blocks images were shown at random

Introduction
Challenge traditional model of how the brain processes visual information
Examine whether semantic access occurs for a meaningful object that is suggested, but not consciously perceived, on the ground side of the border of a meaningless novel object
Is there any neural activity when unconsciously processing recognizable objects? If so, does priming affect semantic processing?
Example
Results
Results
Comparison
Task and Post Experiment Questioning

Data Acquisition
EEG
Great temporal resolution
Non-invasive
Direct result of a cognitive response
N400, a negative-going component of the event-related potential (ERP)
Presence of a N400 peak indicates object recognition and its meaning
Full transcript