The representation of word form and location in visual ...

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Lars Strother ([email protected]), Alexandra M. Coros ([email protected]) & Tutis Vilis ([email protected]). Is there a 'visual word form ...
The Representation of Word Form and Location in Visual Cortex Lars Strother ([email protected]), Alexandra M. Coros ([email protected]) & Tutis Vilis ([email protected])

Is there a ‘visual word form area’? Is there a visual word form area (VWFA) in left ventral occipitotemporal cortex (vOT)? [1,2]

Words > Objects in the VWFA? Left OFA? Left words

Right words

GOAL: Find an area that shows:

VWFA

Corpus callosum

Cohen et al. (2000)

Words > Fixation

(1) Adaptation to whole words [3,4]

V1-V4

V1-V4

FFA

LO

OFA

(2) Stronger fMRI responses to words than to objects -42, -58, -12 (±1)

(3) Position-invariant fMRI responses to words [1,5]

Whole-word adaptation in the VWFA? VWFA

Diff > Same OR Left REPEAT > Same

The VWFA and left OFA (but not LO) both respond more strongly to WORDS vs. OBJECTS.

Position sensitivity in left vOT

The VWFA was originally defined as position-invariant [1].

(WHITE)

(bias)

(bias)

VWFA (bias)

FFA

Right REPEAT > Same AND Left REPEAT > Same

Words were presented in one of five locations

LO OFA

This has recently been called into question [4].

(ORANGE)

Characteristics Whole-word adaptation





Words > Objects





Position Sensitivity All subjects showed adaptation in VWFA and also in more posterior vOT

VWFA Left OFA Left LO





The VWFA shows (1) whole-word adaptation and (2) words > objects. Left FFA does not.



Left vOT is sensitive to word position.



The VWFA and left OFA show wordselectivity but not position-invariance.

VWFA

Right words

Corpus callosum

The VWFA adapts to WHOLE WORDS but not to HALF WORDS.

Conclusions

Left words

OFA

V1-V4

V1-V4

[1] Cohen, L., Dehaene, S., Naccache, L., Lehericy, S., Lambertx, G., Henaff, M., Michel, F. (2000) Brain 123:291-307 [2] Price, C., and Devlin, T. (2003) NeuroImage 19:3 473-481 [3] Glezer, L., Jiang, X., Riesenhuber, M. (2009) Neuron 62: 199-204 [4] Molko, N., Cohen, L., Mangin, JF., Chochon, F., Lehericy, S., Le Bihan, D., Dehaene, S., (2002) JoCN [5] Rauschecker, A., Bowen, R., Parvisi, J., Wandell, B. (2012) PNAS