Fourth International Workshop on Attention and Cognition

日時：２００４年３月１５日（月曜日）　１６：００−１９：３０
場所：つくば国際会議場エポカル　４０３会議室（前回案内から場所が変更に鳴りましたので、ご注意下さい。）http://www.epochal.or.jp/
参加費：無料

内容：
＜特別講演＞　16:05-17:20
M. Jane Riddoch (University of Birmingham)
Action as Perceptual Glue

＜一般研究発表＞　17:25-19:25

Cees van Leeuwen1,2 & Thomas Lachmann1,3 (1. Brain Science Institute, RIKEN, 2. University of Sunderland, UK, 3. University of Leipzig, Germany)
Negative and Positive Congruence Effects in Letters and Shapes

Chie Nakatani (Laboratory for Perceptual Dynamics, RIKEN BSI)
EEG phase synchronization analysis applied to the attentional blink phenomenon.

Yuko Hibi and Kazuhiko Yokosawa (University of Tokyo)
Task-irrelevant factors influencing the selection of objects and actions

Akio Nishimura & Kazuhiko Yokosawa (University of Tokyo)
Stimulus representation underlying orthogonal stimulus-response compatibility effect

特別講演要旨：
Action as Perceptual Glue
M. Jane Riddoch and Glyn W. Humphreys,
University of Birmingham, UK

Patients with visual extinction are able to detect and report single stimuli presented in either their ipsi-or contralesional fields; however, performance deteriorates when two stimuli are presented simultaneously. One account of this impairment is that stimuli in the contralesional field are weighted less strongly for attention than those in the ipsilesional field and therefore lose out in any competition for selection. Recovery from extinction has been demonstrated if the stimuli group according to low-level Gestalt factors (such as colinearity or closure) or by activating stored object representations (such as when two letters for a word) . Grouping between ipsi- and contralesional stimuli allows them to act as allies rather than competitors for attention as they now operate as a single perceptual unit. Recently, we have demonstrated that action relationships between stimuli also result in recovery from extinction . Here we presented stimuli that would commonly be used together (e.g., a corkscrew and wine bottle), and placed them in locations where they could be used together for action or inverted locations, where they would not combine in a common action. We now report further data from a patient with simultanagnosia and extinction which demonstrates that action relations between objects may not only facilitate conscious report but may help bind stimuli to their locations. In addition, we demonstrate that the effects are similar with line drawings and with more ecologically valid photographs; that the objects must be positioned for action and that co-occurrence of the objects (side by side) is not sufficient to reduce extinction; and finally that objects affording particular action (e.g., a paintbrush could be used to stir a bowl) will also allow some recovery from extinction. The implications of the results for understanding visual attention are discussed.