Chapter 18: Attention & Higher Cognition

Attention & Higher Cognition begins by defining selective attention and distinguishing it from global arousal, illustrated by phenomena such as the cocktail party effect and inattentional blindness, which demonstrate the limits of cognitive resources. The text details the attentional bottleneck, debating early-selection versus late-selection models and the role of perceptual load in determining when filtering occurs. It contrasts voluntary, top-down attention—studied via symbolic cuing tasks—with reflexive, bottom-up attention triggered by sensory events, noting the phenomenon of inhibition of return. Visual search mechanisms are explained through feature search versus conjunction search, addressing the binding problem and feature integration theory. Electrophysiological evidence is reviewed, specifically how event-related potentials (ERPs) like the P1, N1, and N2pc components reflect attentional modulation in sensory cortex. The summary delves into the neuroanatomical networks governing these processes, highlighting the roles of the superior colliculus in eye movement, the pulvinar in shifting attention, and the interplay between the dorsal frontoparietal network (involving the intraparietal sulcus and frontal eye field) for voluntary control and the right temporoparietal network for reflexive orienting. Neurological disorders provide critical insights, specifically hemispatial neglect resulting from right parietal damage and Bálint’s syndrome, characterized by simultagnosia, oculomotor apraxia, and optic ataxia. The discussion extends to Attention Deficit Hyperactivity Disorder (ADHD) and its neural correlates. Finally, the chapter tackles consciousness and executive function, distinguishing between the "easy problem" of correlating brain patterns with experience and the "hard problem" of subjective qualia, while exploring the default mode network, the prefrontal cortex's role in executive control and working memory, and the emerging field of neuroeconomics which maps valuation and choice systems in decision-making processes.