Task and spatial frequency modulations of object processing: an EEG study

Craddock, Matt and Martinovic, Jasna and Müller, Matthias M. (2013) Task and spatial frequency modulations of object processing: an EEG study. PLoS ONE, 8 (7). ISSN 1932-6203

Full content URL: https://doi.org/10.1371/journal.pone.0070293

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Abstract

Visual object processing may follow a coarse-to-fine sequence imposed by fast processing of low spatial frequencies (LSF) and slow processing of high spatial frequencies (HSF). Objects can be categorized at varying levels of specificity: the superordinate (e.g. animal), the basic (e.g. dog), or the subordinate (e.g. Border Collie). We tested whether superordinate and more specific categorization depend on different spatial frequency ranges, and whether any such dependencies might be revealed by or influence signals recorded using EEG. We used event-related potentials (ERPs) and time-frequency (TF) analysis to examine the time course of object processing while participants performed either a grammatical gender-classification task (which generally forces basic-level categorization) or a living/non-living judgement (superordinate categorization) on everyday, real-life objects. Objects were filtered to contain only HSF or LSF. We found a greater positivity and greater negativity for HSF than for LSF pictures in the P1 and N1 respectively, but no effects of task on either component. A later, fronto-central negativity (N350) was more negative in the gender-classification task than the superordinate categorization task, which may indicate that this component relates to semantic or syntactic processing. We found no significant effects of task or spatial frequency on evoked or total gamma band responses. Our results demonstrate early differences in processing of HSF and LSF content that were not modulated by categorization task, with later responses reflecting such higher-level cognitive factors. © 2013 Craddock et al.

Keywords:adult, article, decision making, electroencephalogram, event related potential, gamma rhythm, grammar, human, human experiment, language processing, mental load, normal human, semantics, spatial frequency discrimination, stimulus response, task performance, vision, Adolescent, Animals, Brain Mapping, Dogs, Electroencephalography, Evoked Potentials, Female, Humans, Male, Pattern Recognition, Visual, Photic Stimulation, Psychomotor Performance, Reaction Time, Visual Perception, Young Adult
Subjects:C Biological Sciences > C800 Psychology
C Biological Sciences > C830 Experimental Psychology
C Biological Sciences > C850 Cognitive Psychology
Divisions:College of Social Science > School of Psychology
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ID Code:30957
Deposited On:21 Feb 2018 13:13

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