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The duality of temporal encoding - the intrinsic and extrinsic representation of time.

Golan R, Zakay D - Front Psychol (2015)

Bottom Line: We found a gradual increase in neural activation associated with the gradual increase in temporal variance within category selective areas.We concluded that temporal features are integral to perception and are simultaneously represented within category selective regions and globally within dedicated regions.Our second conclusion, drown from our covert procedure, is that time encoding, at its basic level, is an automated process that does not require attention allocated toward the temporal features nor does it require dedicated resources.

View Article: PubMed Central - PubMed

Affiliation: School of Psychological Sciences, Tel Aviv University Tel Aviv, Israel.

ABSTRACT
While time is well acknowledged for having a fundamental part in our perception, questions on how it is represented are still matters of great debate. One of the main issues in question is whether time is represented intrinsically at the neural level, or is it represented within dedicated brain regions. We used an fMRI block design to test if we can impose covert encoding of temporal features of faces and natural scenes stimuli within category selective neural populations by exposing subjects to four types of temporal variance, ranging from 0% up to 50% variance. We found a gradual increase in neural activation associated with the gradual increase in temporal variance within category selective areas. A second level analysis showed the same pattern of activations within known brain regions associated with time representation, such as the Cerebellum, the Caudate, and the Thalamus. We concluded that temporal features are integral to perception and are simultaneously represented within category selective regions and globally within dedicated regions. Our second conclusion, drown from our covert procedure, is that time encoding, at its basic level, is an automated process that does not require attention allocated toward the temporal features nor does it require dedicated resources.

No MeSH data available.


Related in: MedlinePlus

The figure presents an example of the four blocks in the temporal condition using face stimuli. The upper row is an example of the baseline block with 0% variance, while the fourth row is an example of block 4 with 50% variance in durations. The parameters for each block consisted of the following: (a) Number of stimuli in a block was 16; (b) ISI was 350 ms; (c) block duration was 12-s; (d) total exposure to stimulus in all blocks was 6400 ms.
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Figure 1: The figure presents an example of the four blocks in the temporal condition using face stimuli. The upper row is an example of the baseline block with 0% variance, while the fourth row is an example of block 4 with 50% variance in durations. The parameters for each block consisted of the following: (a) Number of stimuli in a block was 16; (b) ISI was 350 ms; (c) block duration was 12-s; (d) total exposure to stimulus in all blocks was 6400 ms.

Mentions: Stimuli used in the temporal condition scans were four different photographs of faces (Figure 1) and four different photographs of houses with an average intensity of 160. Background was grayscale with an intensity of 160 to match the average intensity of the stimuli. Faces and houses images were randomly selected from the images used in the localizer scans; all faces images had the same expression. An altering colored fixation point of 8 pixels × 8 pixels was presented in the center of the images, using Matlab 7 (Psychtoolbox, Brainard, 1997).


The duality of temporal encoding - the intrinsic and extrinsic representation of time.

Golan R, Zakay D - Front Psychol (2015)

The figure presents an example of the four blocks in the temporal condition using face stimuli. The upper row is an example of the baseline block with 0% variance, while the fourth row is an example of block 4 with 50% variance in durations. The parameters for each block consisted of the following: (a) Number of stimuli in a block was 16; (b) ISI was 350 ms; (c) block duration was 12-s; (d) total exposure to stimulus in all blocks was 6400 ms.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4553368&req=5

Figure 1: The figure presents an example of the four blocks in the temporal condition using face stimuli. The upper row is an example of the baseline block with 0% variance, while the fourth row is an example of block 4 with 50% variance in durations. The parameters for each block consisted of the following: (a) Number of stimuli in a block was 16; (b) ISI was 350 ms; (c) block duration was 12-s; (d) total exposure to stimulus in all blocks was 6400 ms.
Mentions: Stimuli used in the temporal condition scans were four different photographs of faces (Figure 1) and four different photographs of houses with an average intensity of 160. Background was grayscale with an intensity of 160 to match the average intensity of the stimuli. Faces and houses images were randomly selected from the images used in the localizer scans; all faces images had the same expression. An altering colored fixation point of 8 pixels × 8 pixels was presented in the center of the images, using Matlab 7 (Psychtoolbox, Brainard, 1997).

Bottom Line: We found a gradual increase in neural activation associated with the gradual increase in temporal variance within category selective areas.We concluded that temporal features are integral to perception and are simultaneously represented within category selective regions and globally within dedicated regions.Our second conclusion, drown from our covert procedure, is that time encoding, at its basic level, is an automated process that does not require attention allocated toward the temporal features nor does it require dedicated resources.

View Article: PubMed Central - PubMed

Affiliation: School of Psychological Sciences, Tel Aviv University Tel Aviv, Israel.

ABSTRACT
While time is well acknowledged for having a fundamental part in our perception, questions on how it is represented are still matters of great debate. One of the main issues in question is whether time is represented intrinsically at the neural level, or is it represented within dedicated brain regions. We used an fMRI block design to test if we can impose covert encoding of temporal features of faces and natural scenes stimuli within category selective neural populations by exposing subjects to four types of temporal variance, ranging from 0% up to 50% variance. We found a gradual increase in neural activation associated with the gradual increase in temporal variance within category selective areas. A second level analysis showed the same pattern of activations within known brain regions associated with time representation, such as the Cerebellum, the Caudate, and the Thalamus. We concluded that temporal features are integral to perception and are simultaneously represented within category selective regions and globally within dedicated regions. Our second conclusion, drown from our covert procedure, is that time encoding, at its basic level, is an automated process that does not require attention allocated toward the temporal features nor does it require dedicated resources.

No MeSH data available.


Related in: MedlinePlus