Matthew Potter - Revision history

imported>Psych204B: /* References */

2010-03-20T06:10:10Z

References

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	=References=		=References=
			Haxby, J., Gobbini, M., Furey, M., Ishai, A., Schouten, J., Pietrini, P. (2001). Distributed and Overlapping Representations of Faces and Objects in Ventral Temporal Cortex. Science, 293(5539), 2425-2430

			Grill-Spector, K. (2003). The Neural Basis of Object Perception. Current Opinion in Neurobiology, 13(2), 159-166

imported>Psych204B: /* References - Resources and related work */

2010-03-20T06:02:49Z

References - Resources and related work

← Older revision		Revision as of 06:02, 20 March 2010
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	It is clear from the above results that, in addition to significant variability between hemispheres (e.g. for the FFA), different conclusions may be inferred from the multi-voxel pattern cross-correlation matrices and the timecourse beta responses. In some cases, the preferred categories differ between the two methods, while in others the discrimination and confusability properties vary. However, the category shown to be preferred by the beta responses is generally confirmed, to some extent, by the corresponding cross-correlation matrix. The differences may be attributable to the distribution of neurons with different functions across the ROI, and also the differing number of voxels under analysis in each method. Information gleaned from the multi-voxel patterns could be used to refine ROIs, or else to give further context to information gleaned from the timecourse beta responses.		It is clear from the above results that, in addition to significant variability between hemispheres (e.g. for the FFA), different conclusions may be inferred from the multi-voxel pattern cross-correlation matrices and the timecourse beta responses. In some cases, the preferred categories differ between the two methods, while in others the discrimination and confusability properties vary. However, the category shown to be preferred by the beta responses is generally confirmed, to some extent, by the corresponding cross-correlation matrix. The differences may be attributable to the distribution of neurons with different functions across the ROI, and also the differing number of voxels under analysis in each method. Information gleaned from the multi-voxel patterns could be used to refine ROIs, or else to give further context to information gleaned from the timecourse beta responses.

	= References ~~- Resources and related work~~ =		=References=

imported>Psych204B: /* Conclusions */

2010-03-20T06:02:19Z

Conclusions

← Older revision		Revision as of 06:02, 20 March 2010
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	= Conclusions =		= Conclusions =

	It is clear from the above results that, in addition to significant variability between hemispheres, different conclusions may be inferred from the multi-voxel pattern cross-correlation matrices vs. the timecourse beta responses.		It is clear from the above results that, in addition to significant variability between hemispheres (e.g. for the FFA), different conclusions may be inferred from the multi-voxel pattern cross-correlation matrices and the timecourse beta responses. In some cases, the preferred categories differ between the two methods, while in others the discrimination and confusability properties vary. However, the category shown to be preferred by the beta responses is generally confirmed, to some extent, by the corresponding cross-correlation matrix. The differences may be attributable to the distribution of neurons with different functions across the ROI, and also the differing number of voxels under analysis in each method. Information gleaned from the multi-voxel patterns could be used to refine ROIs, or else to give further context to information gleaned from the timecourse beta responses.

	= References - Resources and related work =		= References - Resources and related work =

imported>Psych204B: /* Conclusions */

2010-03-20T05:55:30Z

Conclusions

← Older revision		Revision as of 05:55, 20 March 2010
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	= Conclusions =		= Conclusions =

	~~Firstly,~~ from the above results, ~~it is very clear that there is great~~ variability between the ~~hemispheres~~. ~~Secondly, in almost every instance,~~		It is clear from the above results that, in addition to significant variability between hemispheres, different conclusions may be inferred from the multi-voxel pattern cross-correlation matrices vs. the timecourse beta responses.

	= References - Resources and related work =		= References - Resources and related work =

imported>Psych204B: /* Conclusions */

2010-03-20T05:53:22Z

Conclusions

← Older revision		Revision as of 05:53, 20 March 2010
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	= Conclusions =		= Conclusions =

	~~Here~~ is ~~where you say what your results mean~~.		Firstly, from the above results, it is very clear that there is great variability between the hemispheres. Secondly, in almost every instance,

	= References - Resources and related work =		= References - Resources and related work =

imported>Psych204B: /* Human Motion Area (MT): Control Region */

2010-03-20T05:51:16Z

Human Motion Area (MT): Control Region

← Older revision		Revision as of 05:51, 20 March 2010
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	[[File:mt.jpg\|frame\|right\|Figure 1: MT ROIs, Beta Responses, and Cross-correlation Matrices]]		[[File:mt.jpg\|frame\|right\|Figure 1: MT ROIs, Beta Responses, and Cross-correlation Matrices]]

	In the MT, which is used as a control, since it is presumably not selective for the stimuli in the experiment, the beta ~~response~~ in the left hemisphere show slight selectivity for objects, with confusability between faces and places. In the right hemisphere beta responses, selectivity for children's faces is indicated, with confusability between men's faces, indoor scenes, and objects.		In the MT, which is used as a control since it is presumably not selective for the stimuli in the experiment, the beta responses in the left hemisphere show slight selectivity for objects, with confusability between faces and places. In the right hemisphere beta responses, selectivity for children's faces is indicated, with confusability between men's faces, indoor scenes, and objects.
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	<br>		<br>

imported>Psych204B: /* Data Interpretation */

2010-03-20T05:49:23Z

Data Interpretation

← Older revision		Revision as of 05:49, 20 March 2010
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	==Data Interpretation==		==Data Interpretation==
	When looking at the beta responses, selectivity is indicated by a high ratio between the magnitude of the preferred category and the magnitude of the non-preferred categories. Confusability is indicated by a low ratio between these two magnitudes. For the cross-correlation matrices, selectivity is indicated by "hot" on-diagonal elements and "cold" off-diagonal elements. A "hot" off-diagonal element indicates confusability. This method of interpretation applies to all data in the results section.		When looking at the beta responses, selectivity is indicated by a high ratio between the magnitude of the preferred category and the magnitude of the non-preferred categories. Confusability is indicated by a low ratio between these two magnitudes. For the cross-correlation matrices, selectivity is indicated by "hot" on-diagonal elements and "cold" off-diagonal elements. A "hot" off-diagonal element indicates confusability. This method of interpretation applies to all data in the results section.

			Note: Men's faces and children's faces are collectively referred to as the faces category, while indoor and outdoor scenes, and cars and abstract objects, are respectively referred to as the places and objects categories.

	==ROIs, Beta Responses, and Cross-correlation Matrices==		==ROIs, Beta Responses, and Cross-correlation Matrices==

imported>Psych204B: /* Human Motion Area (MT): Control Region */

2010-03-20T05:47:38Z

Human Motion Area (MT): Control Region

← Older revision		Revision as of 05:47, 20 March 2010
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	[[File:mt.jpg\|frame\|right\|Figure 1: MT ROIs, Beta Responses, and Cross-correlation Matrices]]		[[File:mt.jpg\|frame\|right\|Figure 1: MT ROIs, Beta Responses, and Cross-correlation Matrices]]

	~~For~~ the ~~FFA~~, the beta ~~responses~~ in the left hemisphere show ~~excellent~~ selectivity for ~~faces~~, with ~~possible~~ confusability between places ~~and objects~~. In the right hemisphere, ~~there~~ is ~~little variation between the magnitudes of the beta responses~~, ~~indicating~~ confusability between faces, ~~places~~, and objects~~. However, the region is still slightly selective for faces~~.		In the MT, which is used as a control, since it is presumably not selective for the stimuli in the experiment, the beta response in the left hemisphere show slight selectivity for objects, with confusability between faces and places. In the right hemisphere beta responses, selectivity for children's faces is indicated, with confusability between men's faces, indoor scenes, and objects.
	<br>		<br>
	<br>		<br>
	The cross-correlation matrix for the left hemisphere ~~confirms the information~~ in the corresponding beta ~~responses: excellent discrimination<sup>1</sup> of faces and high-confusability between places and objects~~. ~~The~~ cross-correlation matrix ~~for the right hemisphere departs from the corresponding beta responses, showing decent~~ discrimination ~~of faces and somewhat less confusability~~ between ~~places~~ and objects.		The cross-correlation matrix for the left hemisphere shows effective discrimination for all categories, in a significant departure from the corresponding beta values. Similarly, the right hemisphere cross-correlation matrix shows effective discrimination between all categories save for outdoor scenes and abstract objects.
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imported>Psych204B: /* Results */

2010-03-20T05:41:59Z

Results

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 ==ROIs, Beta Responses, and Cross-correlation Matrices==
 ===Fusiform Face Area (FFA)===
 [[File:ffa.jpg|frame|right|Figure 2: FFA ROIs, Beta Responses, and Cross-correlation Matrices]]

imported>Psych204B: /* Parahippocampal Place Area (PPA) */

2010-03-20T05:39:06Z

Parahippocampal Place Area (PPA)

← Older revision		Revision as of 05:39, 20 March 2010
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	===Parahippocampal Place Area (PPA)===		===Parahippocampal Place Area (PPA)===
	[[File:ppa.jpg\|frame\|right\|Figure 3: PPA ROIs, Beta Responses, and Cross-correlation Matrices]]		[[File:ppa.jpg\|frame\|right\|Figure 4: PPA ROIs, Beta Responses, and Cross-correlation Matrices]]

	For the PPA, beta responses in the left hemisphere show selectivity for places, with possible confusability with objects -- particularly between outdoor scenes and cars. In the right hemisphere, the beta values show a somewhat stronger preference for places, and lessened confusability with objects.		For the PPA, beta responses in the left hemisphere show selectivity for places, with possible confusability with objects -- particularly between outdoor scenes and cars. In the right hemisphere, the beta values show a somewhat stronger preference for places, and lessened confusability with objects.
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	===Temporo-Occipital Sulcus (TOS) Place Area===		===Temporo-Occipital Sulcus (TOS) Place Area===
	[[File:sot.jpg\|frame\|right\|Figure 5: TOS ROIs, Beta Responses, and Cross-correlation Matrices]]		[[File:sot.jpg\|frame\|right\|Figure 5: TOS ROIs, Beta Responses, and Cross-correlation Matrices]]