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Partial dissociation in the neural bases of VSTM and imagery in the early visual cortex.

Saad E, Wojciechowska M, Silvanto J - Neuropsychologia (2015)

Bottom Line: We hypothesized that any differential effect of TMS on VSTM and imagery would indicate that their neuronal bases differ at the level of EVC.The impact of TMS on sensitivity did not differ between VSTM and imagery, but did depend on whether the tasks were carried concurrently or alone.This study shows that neural processes associated with VSTM and imagery in the early visual cortex can be partially dissociated.

View Article: PubMed Central - PubMed

Affiliation: Brain Research Unit, O.V. Lounasmaa Laboratory, School of Science, Aalto University, 00076 Espoo, Finland; Institute of Behavioral Sciences, University of Helsinki, 00014 Helsinki, Finland. Electronic address: saad.ely@gmail.com.

No MeSH data available.


Related in: MedlinePlus

Mean (n=15) of sensitivity (d′) as a function of TMS site and contrast difficulty level. (A) VSTM in “alone” condition. (B) Imagery in the “alone” condition. (C) VSTM in “concurrent” condition. (D) Imagery in “concurrent” condition. TMS facilitated the sensitivity of both Imagery and VSTM when conducted separately in the alone condition. Error bars indicate ± SEM from which between-subjects variance has been removed.
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f0010: Mean (n=15) of sensitivity (d′) as a function of TMS site and contrast difficulty level. (A) VSTM in “alone” condition. (B) Imagery in the “alone” condition. (C) VSTM in “concurrent” condition. (D) Imagery in “concurrent” condition. TMS facilitated the sensitivity of both Imagery and VSTM when conducted separately in the alone condition. Error bars indicate ± SEM from which between-subjects variance has been removed.

Mentions: Fig. 2(a–d) shows the mean (n=15) sensitivity (d′) for VSTM and imagery as a function of TMS site and difficulty level. We initially carried out an ANOVA into which all independent variables were entered. This 2×2×2×2 ANOVA, with task (imagery or VSTM), condition type (alone or concurrent), TMS site (EVC or sham), and difficulty (easy or difficult) revealed a main effect of difficulty (F (1,14)=63.62; p<0.001), condition type (F (1,14)=63.75; p=0.02), and a 2-way interaction between condition type and TMS (F (1,14)=21.36; p<0.001). None of the other main effects or interactions were significant.


Partial dissociation in the neural bases of VSTM and imagery in the early visual cortex.

Saad E, Wojciechowska M, Silvanto J - Neuropsychologia (2015)

Mean (n=15) of sensitivity (d′) as a function of TMS site and contrast difficulty level. (A) VSTM in “alone” condition. (B) Imagery in the “alone” condition. (C) VSTM in “concurrent” condition. (D) Imagery in “concurrent” condition. TMS facilitated the sensitivity of both Imagery and VSTM when conducted separately in the alone condition. Error bars indicate ± SEM from which between-subjects variance has been removed.
© Copyright Policy - CC BY-NC-ND
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4542523&req=5

f0010: Mean (n=15) of sensitivity (d′) as a function of TMS site and contrast difficulty level. (A) VSTM in “alone” condition. (B) Imagery in the “alone” condition. (C) VSTM in “concurrent” condition. (D) Imagery in “concurrent” condition. TMS facilitated the sensitivity of both Imagery and VSTM when conducted separately in the alone condition. Error bars indicate ± SEM from which between-subjects variance has been removed.
Mentions: Fig. 2(a–d) shows the mean (n=15) sensitivity (d′) for VSTM and imagery as a function of TMS site and difficulty level. We initially carried out an ANOVA into which all independent variables were entered. This 2×2×2×2 ANOVA, with task (imagery or VSTM), condition type (alone or concurrent), TMS site (EVC or sham), and difficulty (easy or difficult) revealed a main effect of difficulty (F (1,14)=63.62; p<0.001), condition type (F (1,14)=63.75; p=0.02), and a 2-way interaction between condition type and TMS (F (1,14)=21.36; p<0.001). None of the other main effects or interactions were significant.

Bottom Line: We hypothesized that any differential effect of TMS on VSTM and imagery would indicate that their neuronal bases differ at the level of EVC.The impact of TMS on sensitivity did not differ between VSTM and imagery, but did depend on whether the tasks were carried concurrently or alone.This study shows that neural processes associated with VSTM and imagery in the early visual cortex can be partially dissociated.

View Article: PubMed Central - PubMed

Affiliation: Brain Research Unit, O.V. Lounasmaa Laboratory, School of Science, Aalto University, 00076 Espoo, Finland; Institute of Behavioral Sciences, University of Helsinki, 00014 Helsinki, Finland. Electronic address: saad.ely@gmail.com.

No MeSH data available.


Related in: MedlinePlus