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Trans Cranial Magnetic Stimulation (TMS) over dorsal visual system will disturb the ability to identify objects with decreased level of fragmentation
The participants performed two tasks under three different TMS conditions: no TMS, 10Hz TMS for over the dorsal stream (PO3 EEG site) or over the vertex.
First they performed a perceptual closure task which asked them to identify an object in a series of six progressively less degraded pictures.
Then, they also performed a control task previously shown not to be mediated by the LOC and not to be impaired in schizophrenia: The perception of illusory contours.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| No TMS stimulation | No Intervention | The patients performed 2 tasks: a study and a control assignments with no TMS stimulation. |
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| TMS over the dorsal stream | Experimental | The patients performed 2 tasks: a study and a control assignments under TMS stimulation over the dorsal stream area (PO3 EEG site). |
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| TMS over the vertex | Sham Comparator | The patients performed 2 tasks: a study and a control assignments under TMS stimulation over the vertex area. |
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| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| No TMS intervention | Device | In the "no TMS" condition, no simulation was given and no coil placed near participants' heads. |
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| Measure | Description | Time Frame |
|---|---|---|
| Results of the study assignments performed by the participants during the study. | The subjects performed 2 tasks: The primary dependent measures consisted of the level of detail needed for correct object identification, response accuracy, and response time in milliseconds for correct responses. Illusory Contour Task: Subjects also performed a pulsed pedestal task, Participants were shown 55 drawings for 500 ms each. Some drawings contained partial contours which defined a geometric shape, while in others the contours did not define a shape. Participants were asked to indicate whether they recognized a geometric shape or not. Accuracy and response time were measured. | The participants performed the tasks once during their study visit |
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Inclusion Criteria:
Exclusion Criteria:
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| Name | Affiliation | Role |
|---|---|---|
| Revital Amiaz, MD | Sheba Medical Center | Principal Investigator |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Psychiatry Clinic - Sheba Medical Center | Tel Litwinsky | 52621 | Israel |
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| TMS over the PO3 EEG site | Device | 10Hz TMS over the dorsal stream (PO3 EEG site) |
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| TMS over the vertex | Device | 10Hz TMS for over vertex. |
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