Imagining material versus geometric properties of objects: an fMRI study.
Two experiments are reported that used fMRI to compare the brain activation during the imagery of material and geometric object features. In the first experiment, participants were to mentally evaluate objects along either a material dimension (roughness, hardness and temperature; e.g., Which is harder, a potato or a mushroom?) or a geometric dimension (size and shape; e.g., Which is larger, a pumpkin or a cucumber?). In the second experiment, when given the name of an object and either a material (roughness and hardness) or geometric (size and shape) property participants rated the object on a scale from 1 to 4. Both experiments were designed to examine the underlying neural substrate that supports the processing of material object properties with respect to geometric properties. Considering the relative amount of activation across the two types of object properties, we found that (1) the interrogation of geometric features differentially evokes visual imagery which involves the region in and around the intraparietal sulcus, (2) the interrogation of material features differentially evokes the processing of semantic object representations which involves the inferior extrastriate region, and (3) the lateral occipital cortex (LOC) responds to shape processing regardless of whether the feature being queried is a material or geometric feature.
Newman
Sharlene D
SD
Department of Psychology, Indiana University, 1101 E. 10th Street, Bloomington, IN 47405, USA. sdnewman@indiana.edu
Klatzky
Roberta L
RL
Lederman
Susan J
SJ
Just
Marcel Adam
MA
D000328:Adult; D005074:Evoked Potentials, Visual / Q000502:physiology; D005260:Female; D005556:Form Perception / Q000502:physiology*; D006801:Humans; D007092:Imagination / Q000502:physiology*; D008279:Magnetic Resonance Imaging; D008297:Male; D008568:Memory / Q000502:physiology; D009044:Motor Cortex / Q000502:physiology; D010296:Parietal Lobe / Q000502:physiology; D013003:Somatosensory Cortex / Q000502:physiology; D013702:Temporal Lobe / Q000502:physiology; D014793:Visual Cortex / Q000502:physiology