Gardner Lab

Psychology Department

Neurosciences Institute

Stanford University


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-What cortical mechanisms allow humans to easily discern the expression or identity of a face? Subjects detectedchanges in expression or identity of a stream of dynamic faces while we measured BOLD responses from topo-graphically and functionally defined areas throughout the visual hierarchy. Responses in dorsal areas increasedduring the expression task, whereas responses in ventral areas increased during the identity task, consistent withprevious studies. Similar to ventral areas, early visual areas showed increased activity during the identity task. Ifvisual responses are weighted by perceptual mechanisms according to their magnitude, these increased responseswould lead to improved attentional selection of the task-appropriate facial aspect. Alternatively, increased re-sponses could be a signature of a sensitivity enhancement mechanism that improves representations of theattended facial aspect. Consistent with the latter sensitivity enhancement mechanism, attending to expression ledto enhanced decoding of exemplars of expression both in early visual and dorsal areas relative to attendingidentity. Similarly, decoding identity exemplars when attending to identity was improved in dorsal and ventralareas. We conclude that attending to expression or identity of dynamic faces is associated with increased selec-tivity in representations consistent with sensitivity enhancement.++{{:reprints:dobs_et_al.pdf|pdf}}+What cortical mechanisms allow humans to easily discern the expression or identity of a face? Subjects detected changes in expression or identity of a stream of dynamic faces while we measured BOLD responses from topo-graphically and functionally defined areas throughout the visual hierarchy. Responses in dorsal areas increasedduring the expression task, whereas responses in ventral areas increased during the identity task, consistent with previous studies. Similar to ventral areas, early visual areas showed increased activity during the identity task. If visual responses are weighted by perceptual mechanisms according to their magnitude, these increased responses would lead to improved attentional selection of the task-appropriate facial aspect. Alternatively, increased responses could be a signature of a sensitivity enhancement mechanism that improves representations of the attended facial aspect. Consistent with the latter sensitivity enhancement mechanism, attending to expression led to enhanced decoding of exemplars of expression both in early visual and dorsal areas relative to attending identity. Similarly, decoding identity exemplars when attending to identity was improved in dorsal and ventral areas. We conclude that attending to expression or identity of dynamic faces is associated with increased selectivity in representations consistent with sensitivity enhancement.++{{:reprints:dobs_et_al.pdf|pdf}}
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Laquitaine, S. and Gardner, J. L. (2018) A switching observer for human perceptual estimation. //Neuron// 97(2): 462-474. [[https://dx.doi.org/10.1016/j.neuron.2017.12.011|DOI]] Laquitaine, S. and Gardner, J. L. (2018) A switching observer for human perceptual estimation. //Neuron// 97(2): 462-474. [[https://dx.doi.org/10.1016/j.neuron.2017.12.011|DOI]]